Dan Ferrell píše o údržbě a opravách automobilů svépomocí. Má certifikace v oblasti automatizační a řídicí techniky.
Zde je deset důvodů, proč vaše auto nenastartuje ... 1. Vybitá baterie 2. Špatný startovací motor nebo systém 3. Vadný alternátor 4. Ucpaný palivový filtr 5. Vadný regulátor tlaku paliva 6. Špatné palivové čerpadlo 7. Vadná zapalovací cívka nebo modul 8. Vadný snímač polohy klikového hřídele nebo snímač polohy vačkového hřídele 9. Velký únik vakua 10. Selhal rozvodový řemen Dále v tomto článku vám pomůžeme projít některými testy a rozhodnout, který problém je váš, abyste se mohli vrátit na cestu. ...V pěti obecných kategoriích Váš problém velmi často spadá do jedné z těchto pěti kategorií: Vybitá baterie Vadný startér nebo alternátor Problémy s palivovým systémem Problémy se zapalovacím systémem Špatný senzor Několik doporučení, než začnete s diagnostikou Nepřeskakujte to, co je zřejmé. Například se ujistěte, že máte v palivové nádrži skutečně plyn a že je vaše baterie nabitá a má čisté a těsné spoje. Začněte tím, že si projdete první dvě sekce níže. Mohou vám pomoci zaměřit se na potenciální problém a v případě potřeby zkontrolovat problémy s dodávkou paliva, aby vám ušetřili čas a možná i peníze. Je také dobré mít návod k opravě pro vaši konkrétní značku a model vozidla. Můžete si koupit relativně levnou kopii přes Amazon. Příručka Haynes vám může pomoci najít součásti. Obsahuje také podrobné postupy, popisy systémů a obrázky a fotografie pro mnoho úkolů údržby, odstraňování problémů a výměny dílů – takže se vám malá investice brzy vrátí. Předdiagnostika 1:Použití zvuku jako diagnostického nástroje Při řešení problému s motorem, který odmítá nastartovat, můžete použít zvuky nebo jejich nedostatek jako diagnostický nástroj. Zvuky vám pomohou zaměřit se na systém nebo systémy, kde by se problém mohl nacházet, a eliminovat další potenciální problémová místa. Jaký zvuk slyšíte při pokusu o nastartování motoru? 1. Jediným kliknutím Pokud při pokusu nastartovat auto uslyšíte jediné, nepřerušované cvaknutí, problém může být ve startéru nebo obvodu. 2. Rachotivý zvuk Rachotivý zvuk vycházející zpod kapoty při pokusu o nastartování motoru může ukazovat na nedostatečně nabitou baterii, uvolněné nebo zkorodované svorky baterie nebo na problém s alternátorem nebo systémem dobíjení. 3. Vůbec žádný zvuk Pokud při pokusu o nastartování auta nic neslyšíte, zkontrolujte: vybitá baterie uvolněný povrch (baterie nebo motor) uvolněné nebo zkorodované kontakty baterie elektrické přerušení v systému zapalování vypálená pojistka startéru nebo palivové čerpadlo 4. Zvuk otáčení motoru Když otočíte klíčkem zapalování, abyste nastartovali motor, můžete slyšet obvyklé burácení motoru, ale motor se ve skutečnosti nikdy nenastartuje. Pokud ano: Ujistěte se, že se palivové čerpadlo aktivuje, když otočíte klíčkem zapalování do polohy „Zapnuto“ – poslouchejte, zda se ozve bzučivý zvuk, který trvá asi 2 sekundy. Pokud se neozývá žádné bzučení, čerpadlo nedosahuje napětí nebo čerpadlo selhalo. Zkontrolujte obvod. Zkontrolujte dodávku paliva. Viz další část. Zkontrolujte, zda není ucpaný palivový filtr, pokud se do válců nedostává málo paliva nebo žádné palivo. Ujistěte se, že zapalovací systém dodává jiskru do zapalovacích svíček. V případě potřeby nahlédněte do Zdroje část ve spodní části tohoto příspěvku, kde najdete nápovědu k těmto a dalším problémům. Předdiagnostika 2:Kontrola dodávky rychlého palivového systému Často lze stav bez startu vysledovat až k závadě v palivovém systému. Pokud se váš motor přetáčí, ale odmítá nastartovat, proveďte tento jednoduchý test. Tento test vám může zjistit, zda problém souvisí s dodávkou paliva. Odstraňte vzduchový kanál, abyste měli přístup k tělu škrticí klapky. Nastříkejte trochu startovací kapaliny za škrticí ventil. Zkuste nastartovat motor. Pokud motor na několik sekund naskočí a poté zhasne, váš problém s největší pravděpodobností souvisí s palivem. Zkontrolujte palivový filtr, regulátor tlaku paliva a palivové čerpadlo, jak je uvedeno v následujících částech. Následující video ukazuje, jak používat startovací kapalinu. Nyní:Deset běžných chyb a jak každou z nich zkontrolovat Nyní, když máte představu o tom, jaký systém je třeba prozkoumat, můžete začít zkoumat. Následujících deset oddílů pojednává o deseti nejčastějších závadách, které pravděpodobně budete řešit, když vaše auto odmítne nastartovat, a o tom, jak postupovat při kontrole každé potenciální závady. 1. Baterie je vybitá To je jeden z nejčastějších důvodů, proč auto nejde nastartovat. Autobaterie může vydržet až šest let v závislosti na údržbě a provozních podmínkách. Jeho životnost zkrátí například extrémní povětrnostní podmínky. Není však neobvyklé, že se baterie náhle vybije. Zkontrolujte připojení svorek baterie. Odstraňte korozi a ujistěte se, že jsou svorky těsné. Poté zkontrolujte hladinu elektrolytu, pokud má baterie odnímatelné kryty. Když auto odmítne nastartovat, ujistěte se, že je baterie dobře nabitá. Stav nabití můžete zkontrolovat pomocí digitálního multimetru (DMM). Kontrola stavu nabití baterie: Vypněte veškeré příslušenství, zavřete dveře a otevřete kapotu. Nastavte voltmetr na 20 V DC. Zapněte DMM a připojte černý kabel k zápornému (-) pólu baterie a červený ke kladnému (+) pólu baterie. Vaše baterie by měla mít alespoň 12,4 V; jinak nabijte baterii nebo ji nechte zkontrolovat v místním obchodě s autodíly. Pokud potřebujete baterii dobít, použijte pokud možno pomalé nabíjení. To pomůže obnovit stav baterie. Váš místní obchod s autodíly může zkontrolovat, zda je vaše baterie stále v pořádku. 2. Špatný motor nebo systém spouštěče Dalšími běžnými zdroji problémů jsou startér a jeho obvod. Tento systém může být na vině, pokud při pokusu o nastartování motoru uslyšíte pevné cvaknutí. Může být problém s elektromagnetem spouštěče, relé nebo spouštěcím motorem. V případě potřeby zkontrolujte obvod pomocí testu poklesu napětí. Viz Zdroje v dolní části tohoto příspěvku, kde najdete pomoc s tímto testem. Váš místní obchod s autodíly také zdarma zkontroluje startér, ale budete muset startér z vozidla vyjmout. 3. Faulty Alternator Along with a dead or bad battery, alternator issues are one of the most common reasons for a no-start condition. Usually, the charging system will turn on a warning light on the dashboard alerting you about a fault in the system. However, there are many reasons a charging system may fail to deliver a charge to the battery or electrical power to other systems in the vehicle. Points to check: Check for a loose or worn belt or a worn or damaged belt tensioner. Inspect the condition of the wiring and connectors. Have the alternator checked at your local auto parts store. Do an alternator circuit voltage drop test, if necessary. See the Resources section. Keep in mind that a corroded battery terminal could be a sign of an alternator overcharging the battery. If you don't want to do it, your local auto parts store will check the alternator for you. 4. Fuel Filter Clogged Most manufacturers recommend replacing the fuel filter every one or two years. Replace your fuel filter as recommended. Although many fuel filters include a bypass valve in case the filter clogs, not all come equipped with this valve. Besides, rust and other sediments in the fuel tank can make their way to the fuel filter and clog its filter element. Before giving out completely, a clogging fuel filter will give you one or more signs. For example, you may notice a lack of engine power at high speeds, difficulty starting the engine, or poor acceleration. Check your repair manual to inspect the fuel filter and system in your particular model, if necessary. If you suspect insufficient fuel reaching the injectors, do the quick fuel system delivery check as described in the second section of this post. 5. Faulty Fuel Pressure Regulator A fuel pressure regulator (FPR) limits the amount of pressure buildup in the system, typically to between 35 and 45 psi. Check your vehicle repair manual for your model specifications. But FPRs can fail. If the internal diaphragm begins to leak fuel into the intake manifold, pressure will drop, and the cylinders will be flooded with fuel, making the engine hard to start. Also, if too much raw fuel reaches the catalytic converter, the Check Engine Light (CEL) will begin to flash on your dashboard. If you suspect insufficient fuel reaching the injectors, do the quick fuel system delivery check as described in the "Pre-Diagnostic 2" section of this article above. You can perform a few FPR tests at home. Viz Zdroje section at the bottom of this article for some help. 6. Bad Fuel Pump Fuel pumps have a long service life. They can last 80,000 miles or more. If your fuel filter and fuel pressure regulator are fine, but you have a fuel issue, probably your fuel pump is bad. When turning the ignition key to the "On" position, before trying to start the engine, you should hear a buzzing sound for a couple of seconds. This is the sound of the fuel pump motor being activated to prime the fuel delivery system. If you don't hear this sound, it may be that: no voltage is reaching the fuel pump, the fuel pump fuse is blown, the fuel pump relay is bad, or the pump itself may have failed. To verify a fuel delivery issue, do the quick fuel system delivery check as described in the second diagnostic section near the top of this article. Also, check the repair manual for your particular model to see how to test the fuel pump, if necessary. 7. Faulty Ignition Coil or Module For the most part, ignition coils or modules are pretty reliable. Unlike spark plugs, wires, and distributor caps (depending on the model), an ignition coil or module doesn't require much attention. However, they can fail from time to time. The conditions under which they operate, like heat, vibration and other engine performance issues, can have an adverse effect on any of these components after many miles of operation. Older vehicle models used a single ignition coil and module to deliver a spark to the spark plugs. Newer models may use a module and one coil per spark plug. A failed coil or module in one of these models will certainly prevent the engine from starting. You can use a spark tester to verify the presence and condition of the spark. You can buy one at your local auto parts store. If possible, get an adjustable spark tester you can use in different vehicles. The Resources section at the bottom of this post, and your vehicle repair manual, can help you check an ignition coil or test for the presence of a spark in the ignition system. 8. Faulty Crankshaft or Camshaft Position Sensor The crankshaft position (CKP) sensor monitors engine speed, and the camshaft position (CMP) sensor tracks the position of the camshaft. The electronic control module (ECM), the car's computer, uses the signal from both sensors to control fuel injection operation, direct ignition, and, depending on vehicle model, the variable valve timing system. If any of these sensors fails, your car may fail to start. Sometimes, depending on the specific fault, a bad CKP or CMP will trigger the check engine light (CEL). Whether the CEL illuminates on your dashboard or not, it's a good idea to scan the computer memory for potential diagnostic trouble codes (DTCs) that can help you diagnose a no-start condition. If you don't have a scan tool, your local auto parts store may download DTCs for you without cost. Also, check your vehicle repair manual. And, within the Resources section at the bottom of this post, you'll find links to other posts to help you check these sensors yourself, if possible. 9. Major Vacuum Leak Major vacuum leaks are not common, but they definitely happen. A vacuum leak can make the air-fuel mixture too lean, preventing the engine from starting. A leak may come from a vacuum line, intake manifold gasket, throttle body gasket, leaking EGR valve gasket, power brake booster or positive crankcase ventilation (PCV) valve. Vacuum leaks can be tricky to find. You can visually inspect every vacuum hose and trace it with your hand, feeling for tears or damaged spots. Also, pay attention to hissing sounds that may indicate a leak. A leaking gasket is harder to detect, though, unless you have a smoke machine designed for this purpose. V případě potřeby nahlédněte do návodu k opravě vozidla. 10. Failed Timing Belt You won't see this type of failure often. Timing belts can last between 50,000 and 100,000 miles or more, depending on your particular model. And if you have a timing chain rather than a belt, you may never have to worry about replacing it. Still, if you've checked the usual suspect without success, check for a failed timing belt or chain. The engine's crankshaft and camshaft are joined by a timing belt or chain through a series of sprockets. When this belt or chain brakes or wears out, or the tensioner fails, the crankshaft won't be able to rotate the camshaft anymore, making it impossible to start the engine. Checking for a failed timing belt or chain: On a vehicle fitted with a distributor, you can remove the distributor cap and try to fire up the engine. If the distributor rotor doesn't move, most likely your timing belt or chain, or one of the system components, has failed. On models with multiport fuel injection systems, sometimes it's possible to remove the timing belt or chain cover to check for camshaft movement while trying to start the engine. Or you may be able to remove the oil cap from the valve cover, or the cover itself if necessary, to check for valve movement while trying to start the engine. If there's no movement, it's time to check the belt, chain, or system components. If the camshaft rotates, you may still want to verify ignition timing. If the belt or chain has skipped some sprocket teeth, it may be difficult or impossible to start your engine. Consult your vehicle repair manual to check crankshaft and camshaft synchronization. A Few Unusual Additional Possibilities Of course, there are other model-specific components or systems that can prevent your vehicle from starting. Například: A faulty key fob or with a drained battery. Inertia fuel shut-off switch triggered during an accident or a jolt on the road. Faulty anti-theft system. Consult the repair manual for your specific make and model for help on these and other systems or components. Dealing With a Car That Won't Start To sum up, when your car won't start, begin your diagnostic with the most simple components or obvious potential problems, as in Diagnostics 1 and 2 at the beginning of the article: Make sure there's gas in the fuel tank. Verify your battery's state of charge. Make sure battery terminals are clean and tight. Check the battery and engine ground connections. Verify the fuel pump is energizing when turning the ignition key to On. Check for blown fuses. Then you can start checking the alternator, starter motor, ignition, fuel system pressure, and their circuits. Most of the time you'll be able to fix the problem yourself. Sometimes, you will need to replace a fuel pressure regulator, ignition coil, module, or fuel pump, or fix a vacuum leak. See the Resources below for diagnostic ideas if you have narrowed your problem down to a particular system. Resources on Starting System Faults Car Starter Problems? Five Starting-System Inspection Tips Car starter problems? Don't blame the starter motor yet. These 5 troubleshooting tips will help you find the culprit. Jak používat pokles napětí k odstraňování problémů se systémem startéru Testování poklesu napětí vám může pomoci najít problémová místa v obvodu startéru, než budete zbytečně vyměňovat součástky. Resources on Charging Circuit Faults Troubleshooting Alternator and Charging System Problems Diagnose alternator and charging system problems with this practical guide to get your car back on the road faster. How to Do a Voltage Drop Test on Your Charging System Voltage-drop test your charging system circuit before condemning your alternator. Resources on the Fuel System Jak testovat regulátor tlaku paliva Naučte se testovat regulátor tlaku paliva, abyste ušetřili peníze a čas při opravách automobilů. Resources for Dealing with the Crankshaft and Camshaft Sensors Jak otestovat snímač polohy klikového hřídele pomocí multimetru Odstraňte problémy s indukčním snímačem polohy klikového hřídele nebo snímačem polohy klikového hřídele typu Hallova efektu (CKP) pomocí digitálního multimetru. Test snímače polohy vačkového hřídele Test snímače polohy vačkového hřídele můžete provést doma pomocí digitálního multimetru a v případě potřeby pomocí několika běžných nástrojů. Můj motor nemá na cívce jiskru Pokud zapalovací systém vašeho auta nemá jiskru, několik jednoduchých testů vám pomůže najít závadu. Resources for Dealing With Battery Faults How to Test a Car Battery With a Multimeter or Hydrometer This guide will show you how to use a digital multimeter, hydrometer, and other simple tools to troubleshoot, inspect, and clean your battery if necessary. How to Do a Parasitic Battery Drain Test Find that parasitic battery drain that's causing your car battery problems whether you have a newer or older vehicle model. Tento obsah je přesný a pravdivý podle nejlepšího vědomí autora a nemá nahrazovat formální a individualizované rady od kvalifikovaného profesionála.
1. Vybitá baterie
2. Špatný startovací motor nebo systém
3. Vadný alternátor
4. Ucpaný palivový filtr
5. Vadný regulátor tlaku paliva
6. Špatné palivové čerpadlo
7. Vadná zapalovací cívka nebo modul
8. Vadný snímač polohy klikového hřídele nebo snímač polohy vačkového hřídele
9. Velký únik vakua
10. Selhal rozvodový řemen
Dále v tomto článku vám pomůžeme projít některými testy a rozhodnout, který problém je váš, abyste se mohli vrátit na cestu.
Váš problém velmi často spadá do jedné z těchto pěti kategorií:
Předdiagnostika 1:Použití zvuku jako diagnostického nástroje Při řešení problému s motorem, který odmítá nastartovat, můžete použít zvuky nebo jejich nedostatek jako diagnostický nástroj. Zvuky vám pomohou zaměřit se na systém nebo systémy, kde by se problém mohl nacházet, a eliminovat další potenciální problémová místa. Jaký zvuk slyšíte při pokusu o nastartování motoru? 1. Jediným kliknutím Pokud při pokusu nastartovat auto uslyšíte jediné, nepřerušované cvaknutí, problém může být ve startéru nebo obvodu. 2. Rachotivý zvuk Rachotivý zvuk vycházející zpod kapoty při pokusu o nastartování motoru může ukazovat na nedostatečně nabitou baterii, uvolněné nebo zkorodované svorky baterie nebo na problém s alternátorem nebo systémem dobíjení. 3. Vůbec žádný zvuk Pokud při pokusu o nastartování auta nic neslyšíte, zkontrolujte: vybitá baterie uvolněný povrch (baterie nebo motor) uvolněné nebo zkorodované kontakty baterie elektrické přerušení v systému zapalování vypálená pojistka startéru nebo palivové čerpadlo 4. Zvuk otáčení motoru Když otočíte klíčkem zapalování, abyste nastartovali motor, můžete slyšet obvyklé burácení motoru, ale motor se ve skutečnosti nikdy nenastartuje. Pokud ano: Ujistěte se, že se palivové čerpadlo aktivuje, když otočíte klíčkem zapalování do polohy „Zapnuto“ – poslouchejte, zda se ozve bzučivý zvuk, který trvá asi 2 sekundy. Pokud se neozývá žádné bzučení, čerpadlo nedosahuje napětí nebo čerpadlo selhalo. Zkontrolujte obvod. Zkontrolujte dodávku paliva. Viz další část. Zkontrolujte, zda není ucpaný palivový filtr, pokud se do válců nedostává málo paliva nebo žádné palivo. Ujistěte se, že zapalovací systém dodává jiskru do zapalovacích svíček. V případě potřeby nahlédněte do Zdroje část ve spodní části tohoto příspěvku, kde najdete nápovědu k těmto a dalším problémům. Předdiagnostika 2:Kontrola dodávky rychlého palivového systému Často lze stav bez startu vysledovat až k závadě v palivovém systému. Pokud se váš motor přetáčí, ale odmítá nastartovat, proveďte tento jednoduchý test. Tento test vám může zjistit, zda problém souvisí s dodávkou paliva. Odstraňte vzduchový kanál, abyste měli přístup k tělu škrticí klapky. Nastříkejte trochu startovací kapaliny za škrticí ventil. Zkuste nastartovat motor. Pokud motor na několik sekund naskočí a poté zhasne, váš problém s největší pravděpodobností souvisí s palivem. Zkontrolujte palivový filtr, regulátor tlaku paliva a palivové čerpadlo, jak je uvedeno v následujících částech. Následující video ukazuje, jak používat startovací kapalinu. Nyní:Deset běžných chyb a jak každou z nich zkontrolovat Nyní, když máte představu o tom, jaký systém je třeba prozkoumat, můžete začít zkoumat. Následujících deset oddílů pojednává o deseti nejčastějších závadách, které pravděpodobně budete řešit, když vaše auto odmítne nastartovat, a o tom, jak postupovat při kontrole každé potenciální závady. 1. Baterie je vybitá To je jeden z nejčastějších důvodů, proč auto nejde nastartovat. Autobaterie může vydržet až šest let v závislosti na údržbě a provozních podmínkách. Jeho životnost zkrátí například extrémní povětrnostní podmínky. Není však neobvyklé, že se baterie náhle vybije. Zkontrolujte připojení svorek baterie. Odstraňte korozi a ujistěte se, že jsou svorky těsné. Poté zkontrolujte hladinu elektrolytu, pokud má baterie odnímatelné kryty. Když auto odmítne nastartovat, ujistěte se, že je baterie dobře nabitá. Stav nabití můžete zkontrolovat pomocí digitálního multimetru (DMM). Kontrola stavu nabití baterie: Vypněte veškeré příslušenství, zavřete dveře a otevřete kapotu. Nastavte voltmetr na 20 V DC. Zapněte DMM a připojte černý kabel k zápornému (-) pólu baterie a červený ke kladnému (+) pólu baterie. Vaše baterie by měla mít alespoň 12,4 V; jinak nabijte baterii nebo ji nechte zkontrolovat v místním obchodě s autodíly. Pokud potřebujete baterii dobít, použijte pokud možno pomalé nabíjení. To pomůže obnovit stav baterie. Váš místní obchod s autodíly může zkontrolovat, zda je vaše baterie stále v pořádku. 2. Špatný motor nebo systém spouštěče Dalšími běžnými zdroji problémů jsou startér a jeho obvod. Tento systém může být na vině, pokud při pokusu o nastartování motoru uslyšíte pevné cvaknutí. Může být problém s elektromagnetem spouštěče, relé nebo spouštěcím motorem. V případě potřeby zkontrolujte obvod pomocí testu poklesu napětí. Viz Zdroje v dolní části tohoto příspěvku, kde najdete pomoc s tímto testem. Váš místní obchod s autodíly také zdarma zkontroluje startér, ale budete muset startér z vozidla vyjmout. 3. Faulty Alternator Along with a dead or bad battery, alternator issues are one of the most common reasons for a no-start condition. Usually, the charging system will turn on a warning light on the dashboard alerting you about a fault in the system. However, there are many reasons a charging system may fail to deliver a charge to the battery or electrical power to other systems in the vehicle. Points to check: Check for a loose or worn belt or a worn or damaged belt tensioner. Inspect the condition of the wiring and connectors. Have the alternator checked at your local auto parts store. Do an alternator circuit voltage drop test, if necessary. See the Resources section. Keep in mind that a corroded battery terminal could be a sign of an alternator overcharging the battery. If you don't want to do it, your local auto parts store will check the alternator for you. 4. Fuel Filter Clogged Most manufacturers recommend replacing the fuel filter every one or two years. Replace your fuel filter as recommended. Although many fuel filters include a bypass valve in case the filter clogs, not all come equipped with this valve. Besides, rust and other sediments in the fuel tank can make their way to the fuel filter and clog its filter element. Before giving out completely, a clogging fuel filter will give you one or more signs. For example, you may notice a lack of engine power at high speeds, difficulty starting the engine, or poor acceleration. Check your repair manual to inspect the fuel filter and system in your particular model, if necessary. If you suspect insufficient fuel reaching the injectors, do the quick fuel system delivery check as described in the second section of this post. 5. Faulty Fuel Pressure Regulator A fuel pressure regulator (FPR) limits the amount of pressure buildup in the system, typically to between 35 and 45 psi. Check your vehicle repair manual for your model specifications. But FPRs can fail. If the internal diaphragm begins to leak fuel into the intake manifold, pressure will drop, and the cylinders will be flooded with fuel, making the engine hard to start. Also, if too much raw fuel reaches the catalytic converter, the Check Engine Light (CEL) will begin to flash on your dashboard. If you suspect insufficient fuel reaching the injectors, do the quick fuel system delivery check as described in the "Pre-Diagnostic 2" section of this article above. You can perform a few FPR tests at home. Viz Zdroje section at the bottom of this article for some help. 6. Bad Fuel Pump Fuel pumps have a long service life. They can last 80,000 miles or more. If your fuel filter and fuel pressure regulator are fine, but you have a fuel issue, probably your fuel pump is bad. When turning the ignition key to the "On" position, before trying to start the engine, you should hear a buzzing sound for a couple of seconds. This is the sound of the fuel pump motor being activated to prime the fuel delivery system. If you don't hear this sound, it may be that: no voltage is reaching the fuel pump, the fuel pump fuse is blown, the fuel pump relay is bad, or the pump itself may have failed. To verify a fuel delivery issue, do the quick fuel system delivery check as described in the second diagnostic section near the top of this article. Also, check the repair manual for your particular model to see how to test the fuel pump, if necessary. 7. Faulty Ignition Coil or Module For the most part, ignition coils or modules are pretty reliable. Unlike spark plugs, wires, and distributor caps (depending on the model), an ignition coil or module doesn't require much attention. However, they can fail from time to time. The conditions under which they operate, like heat, vibration and other engine performance issues, can have an adverse effect on any of these components after many miles of operation. Older vehicle models used a single ignition coil and module to deliver a spark to the spark plugs. Newer models may use a module and one coil per spark plug. A failed coil or module in one of these models will certainly prevent the engine from starting. You can use a spark tester to verify the presence and condition of the spark. You can buy one at your local auto parts store. If possible, get an adjustable spark tester you can use in different vehicles. The Resources section at the bottom of this post, and your vehicle repair manual, can help you check an ignition coil or test for the presence of a spark in the ignition system. 8. Faulty Crankshaft or Camshaft Position Sensor The crankshaft position (CKP) sensor monitors engine speed, and the camshaft position (CMP) sensor tracks the position of the camshaft. The electronic control module (ECM), the car's computer, uses the signal from both sensors to control fuel injection operation, direct ignition, and, depending on vehicle model, the variable valve timing system. If any of these sensors fails, your car may fail to start. Sometimes, depending on the specific fault, a bad CKP or CMP will trigger the check engine light (CEL). Whether the CEL illuminates on your dashboard or not, it's a good idea to scan the computer memory for potential diagnostic trouble codes (DTCs) that can help you diagnose a no-start condition. If you don't have a scan tool, your local auto parts store may download DTCs for you without cost. Also, check your vehicle repair manual. And, within the Resources section at the bottom of this post, you'll find links to other posts to help you check these sensors yourself, if possible. 9. Major Vacuum Leak Major vacuum leaks are not common, but they definitely happen. A vacuum leak can make the air-fuel mixture too lean, preventing the engine from starting. A leak may come from a vacuum line, intake manifold gasket, throttle body gasket, leaking EGR valve gasket, power brake booster or positive crankcase ventilation (PCV) valve. Vacuum leaks can be tricky to find. You can visually inspect every vacuum hose and trace it with your hand, feeling for tears or damaged spots. Also, pay attention to hissing sounds that may indicate a leak. A leaking gasket is harder to detect, though, unless you have a smoke machine designed for this purpose. V případě potřeby nahlédněte do návodu k opravě vozidla. 10. Failed Timing Belt You won't see this type of failure often. Timing belts can last between 50,000 and 100,000 miles or more, depending on your particular model. And if you have a timing chain rather than a belt, you may never have to worry about replacing it. Still, if you've checked the usual suspect without success, check for a failed timing belt or chain. The engine's crankshaft and camshaft are joined by a timing belt or chain through a series of sprockets. When this belt or chain brakes or wears out, or the tensioner fails, the crankshaft won't be able to rotate the camshaft anymore, making it impossible to start the engine. Checking for a failed timing belt or chain: On a vehicle fitted with a distributor, you can remove the distributor cap and try to fire up the engine. If the distributor rotor doesn't move, most likely your timing belt or chain, or one of the system components, has failed. On models with multiport fuel injection systems, sometimes it's possible to remove the timing belt or chain cover to check for camshaft movement while trying to start the engine. Or you may be able to remove the oil cap from the valve cover, or the cover itself if necessary, to check for valve movement while trying to start the engine. If there's no movement, it's time to check the belt, chain, or system components. If the camshaft rotates, you may still want to verify ignition timing. If the belt or chain has skipped some sprocket teeth, it may be difficult or impossible to start your engine. Consult your vehicle repair manual to check crankshaft and camshaft synchronization. A Few Unusual Additional Possibilities Of course, there are other model-specific components or systems that can prevent your vehicle from starting. Například: A faulty key fob or with a drained battery. Inertia fuel shut-off switch triggered during an accident or a jolt on the road. Faulty anti-theft system. Consult the repair manual for your specific make and model for help on these and other systems or components. Dealing With a Car That Won't Start To sum up, when your car won't start, begin your diagnostic with the most simple components or obvious potential problems, as in Diagnostics 1 and 2 at the beginning of the article: Make sure there's gas in the fuel tank. Verify your battery's state of charge. Make sure battery terminals are clean and tight. Check the battery and engine ground connections. Verify the fuel pump is energizing when turning the ignition key to On. Check for blown fuses. Then you can start checking the alternator, starter motor, ignition, fuel system pressure, and their circuits. Most of the time you'll be able to fix the problem yourself. Sometimes, you will need to replace a fuel pressure regulator, ignition coil, module, or fuel pump, or fix a vacuum leak. See the Resources below for diagnostic ideas if you have narrowed your problem down to a particular system. Resources on Starting System Faults Car Starter Problems? Five Starting-System Inspection Tips Car starter problems? Don't blame the starter motor yet. These 5 troubleshooting tips will help you find the culprit. Jak používat pokles napětí k odstraňování problémů se systémem startéru Testování poklesu napětí vám může pomoci najít problémová místa v obvodu startéru, než budete zbytečně vyměňovat součástky. Resources on Charging Circuit Faults Troubleshooting Alternator and Charging System Problems Diagnose alternator and charging system problems with this practical guide to get your car back on the road faster. How to Do a Voltage Drop Test on Your Charging System Voltage-drop test your charging system circuit before condemning your alternator. Resources on the Fuel System Jak testovat regulátor tlaku paliva Naučte se testovat regulátor tlaku paliva, abyste ušetřili peníze a čas při opravách automobilů. Resources for Dealing with the Crankshaft and Camshaft Sensors Jak otestovat snímač polohy klikového hřídele pomocí multimetru Odstraňte problémy s indukčním snímačem polohy klikového hřídele nebo snímačem polohy klikového hřídele typu Hallova efektu (CKP) pomocí digitálního multimetru. Test snímače polohy vačkového hřídele Test snímače polohy vačkového hřídele můžete provést doma pomocí digitálního multimetru a v případě potřeby pomocí několika běžných nástrojů. Můj motor nemá na cívce jiskru Pokud zapalovací systém vašeho auta nemá jiskru, několik jednoduchých testů vám pomůže najít závadu. Resources for Dealing With Battery Faults How to Test a Car Battery With a Multimeter or Hydrometer This guide will show you how to use a digital multimeter, hydrometer, and other simple tools to troubleshoot, inspect, and clean your battery if necessary. How to Do a Parasitic Battery Drain Test Find that parasitic battery drain that's causing your car battery problems whether you have a newer or older vehicle model. Tento obsah je přesný a pravdivý podle nejlepšího vědomí autora a nemá nahrazovat formální a individualizované rady od kvalifikovaného profesionála.
Při řešení problému s motorem, který odmítá nastartovat, můžete použít zvuky nebo jejich nedostatek jako diagnostický nástroj. Zvuky vám pomohou zaměřit se na systém nebo systémy, kde by se problém mohl nacházet, a eliminovat další potenciální problémová místa.
1. Jediným kliknutím
Pokud při pokusu nastartovat auto uslyšíte jediné, nepřerušované cvaknutí, problém může být ve startéru nebo obvodu.
2. Rachotivý zvuk
Rachotivý zvuk vycházející zpod kapoty při pokusu o nastartování motoru může ukazovat na nedostatečně nabitou baterii, uvolněné nebo zkorodované svorky baterie nebo na problém s alternátorem nebo systémem dobíjení.
3. Vůbec žádný zvuk
Pokud při pokusu o nastartování auta nic neslyšíte, zkontrolujte:
4. Zvuk otáčení motoru
Když otočíte klíčkem zapalování, abyste nastartovali motor, můžete slyšet obvyklé burácení motoru, ale motor se ve skutečnosti nikdy nenastartuje. Pokud ano:
V případě potřeby nahlédněte do Zdroje část ve spodní části tohoto příspěvku, kde najdete nápovědu k těmto a dalším problémům.
Předdiagnostika 2:Kontrola dodávky rychlého palivového systému Často lze stav bez startu vysledovat až k závadě v palivovém systému. Pokud se váš motor přetáčí, ale odmítá nastartovat, proveďte tento jednoduchý test. Tento test vám může zjistit, zda problém souvisí s dodávkou paliva. Odstraňte vzduchový kanál, abyste měli přístup k tělu škrticí klapky. Nastříkejte trochu startovací kapaliny za škrticí ventil. Zkuste nastartovat motor. Pokud motor na několik sekund naskočí a poté zhasne, váš problém s největší pravděpodobností souvisí s palivem. Zkontrolujte palivový filtr, regulátor tlaku paliva a palivové čerpadlo, jak je uvedeno v následujících částech. Následující video ukazuje, jak používat startovací kapalinu. Nyní:Deset běžných chyb a jak každou z nich zkontrolovat Nyní, když máte představu o tom, jaký systém je třeba prozkoumat, můžete začít zkoumat. Následujících deset oddílů pojednává o deseti nejčastějších závadách, které pravděpodobně budete řešit, když vaše auto odmítne nastartovat, a o tom, jak postupovat při kontrole každé potenciální závady. 1. Baterie je vybitá To je jeden z nejčastějších důvodů, proč auto nejde nastartovat. Autobaterie může vydržet až šest let v závislosti na údržbě a provozních podmínkách. Jeho životnost zkrátí například extrémní povětrnostní podmínky. Není však neobvyklé, že se baterie náhle vybije. Zkontrolujte připojení svorek baterie. Odstraňte korozi a ujistěte se, že jsou svorky těsné. Poté zkontrolujte hladinu elektrolytu, pokud má baterie odnímatelné kryty. Když auto odmítne nastartovat, ujistěte se, že je baterie dobře nabitá. Stav nabití můžete zkontrolovat pomocí digitálního multimetru (DMM). Kontrola stavu nabití baterie: Vypněte veškeré příslušenství, zavřete dveře a otevřete kapotu. Nastavte voltmetr na 20 V DC. Zapněte DMM a připojte černý kabel k zápornému (-) pólu baterie a červený ke kladnému (+) pólu baterie. Vaše baterie by měla mít alespoň 12,4 V; jinak nabijte baterii nebo ji nechte zkontrolovat v místním obchodě s autodíly. Pokud potřebujete baterii dobít, použijte pokud možno pomalé nabíjení. To pomůže obnovit stav baterie. Váš místní obchod s autodíly může zkontrolovat, zda je vaše baterie stále v pořádku. 2. Špatný motor nebo systém spouštěče Dalšími běžnými zdroji problémů jsou startér a jeho obvod. Tento systém může být na vině, pokud při pokusu o nastartování motoru uslyšíte pevné cvaknutí. Může být problém s elektromagnetem spouštěče, relé nebo spouštěcím motorem. V případě potřeby zkontrolujte obvod pomocí testu poklesu napětí. Viz Zdroje v dolní části tohoto příspěvku, kde najdete pomoc s tímto testem. Váš místní obchod s autodíly také zdarma zkontroluje startér, ale budete muset startér z vozidla vyjmout. 3. Faulty Alternator Along with a dead or bad battery, alternator issues are one of the most common reasons for a no-start condition. Usually, the charging system will turn on a warning light on the dashboard alerting you about a fault in the system. However, there are many reasons a charging system may fail to deliver a charge to the battery or electrical power to other systems in the vehicle. Points to check: Check for a loose or worn belt or a worn or damaged belt tensioner. Inspect the condition of the wiring and connectors. Have the alternator checked at your local auto parts store. Do an alternator circuit voltage drop test, if necessary. See the Resources section. Keep in mind that a corroded battery terminal could be a sign of an alternator overcharging the battery. If you don't want to do it, your local auto parts store will check the alternator for you. 4. Fuel Filter Clogged Most manufacturers recommend replacing the fuel filter every one or two years. Replace your fuel filter as recommended. Although many fuel filters include a bypass valve in case the filter clogs, not all come equipped with this valve. Besides, rust and other sediments in the fuel tank can make their way to the fuel filter and clog its filter element. Before giving out completely, a clogging fuel filter will give you one or more signs. For example, you may notice a lack of engine power at high speeds, difficulty starting the engine, or poor acceleration. Check your repair manual to inspect the fuel filter and system in your particular model, if necessary. If you suspect insufficient fuel reaching the injectors, do the quick fuel system delivery check as described in the second section of this post. 5. Faulty Fuel Pressure Regulator A fuel pressure regulator (FPR) limits the amount of pressure buildup in the system, typically to between 35 and 45 psi. Check your vehicle repair manual for your model specifications. But FPRs can fail. If the internal diaphragm begins to leak fuel into the intake manifold, pressure will drop, and the cylinders will be flooded with fuel, making the engine hard to start. Also, if too much raw fuel reaches the catalytic converter, the Check Engine Light (CEL) will begin to flash on your dashboard. If you suspect insufficient fuel reaching the injectors, do the quick fuel system delivery check as described in the "Pre-Diagnostic 2" section of this article above. You can perform a few FPR tests at home. Viz Zdroje section at the bottom of this article for some help. 6. Bad Fuel Pump Fuel pumps have a long service life. They can last 80,000 miles or more. If your fuel filter and fuel pressure regulator are fine, but you have a fuel issue, probably your fuel pump is bad. When turning the ignition key to the "On" position, before trying to start the engine, you should hear a buzzing sound for a couple of seconds. This is the sound of the fuel pump motor being activated to prime the fuel delivery system. If you don't hear this sound, it may be that: no voltage is reaching the fuel pump, the fuel pump fuse is blown, the fuel pump relay is bad, or the pump itself may have failed. To verify a fuel delivery issue, do the quick fuel system delivery check as described in the second diagnostic section near the top of this article. Also, check the repair manual for your particular model to see how to test the fuel pump, if necessary. 7. Faulty Ignition Coil or Module For the most part, ignition coils or modules are pretty reliable. Unlike spark plugs, wires, and distributor caps (depending on the model), an ignition coil or module doesn't require much attention. However, they can fail from time to time. The conditions under which they operate, like heat, vibration and other engine performance issues, can have an adverse effect on any of these components after many miles of operation. Older vehicle models used a single ignition coil and module to deliver a spark to the spark plugs. Newer models may use a module and one coil per spark plug. A failed coil or module in one of these models will certainly prevent the engine from starting. You can use a spark tester to verify the presence and condition of the spark. You can buy one at your local auto parts store. If possible, get an adjustable spark tester you can use in different vehicles. The Resources section at the bottom of this post, and your vehicle repair manual, can help you check an ignition coil or test for the presence of a spark in the ignition system. 8. Faulty Crankshaft or Camshaft Position Sensor The crankshaft position (CKP) sensor monitors engine speed, and the camshaft position (CMP) sensor tracks the position of the camshaft. The electronic control module (ECM), the car's computer, uses the signal from both sensors to control fuel injection operation, direct ignition, and, depending on vehicle model, the variable valve timing system. If any of these sensors fails, your car may fail to start. Sometimes, depending on the specific fault, a bad CKP or CMP will trigger the check engine light (CEL). Whether the CEL illuminates on your dashboard or not, it's a good idea to scan the computer memory for potential diagnostic trouble codes (DTCs) that can help you diagnose a no-start condition. If you don't have a scan tool, your local auto parts store may download DTCs for you without cost. Also, check your vehicle repair manual. And, within the Resources section at the bottom of this post, you'll find links to other posts to help you check these sensors yourself, if possible. 9. Major Vacuum Leak Major vacuum leaks are not common, but they definitely happen. A vacuum leak can make the air-fuel mixture too lean, preventing the engine from starting. A leak may come from a vacuum line, intake manifold gasket, throttle body gasket, leaking EGR valve gasket, power brake booster or positive crankcase ventilation (PCV) valve. Vacuum leaks can be tricky to find. You can visually inspect every vacuum hose and trace it with your hand, feeling for tears or damaged spots. Also, pay attention to hissing sounds that may indicate a leak. A leaking gasket is harder to detect, though, unless you have a smoke machine designed for this purpose. V případě potřeby nahlédněte do návodu k opravě vozidla. 10. Failed Timing Belt You won't see this type of failure often. Timing belts can last between 50,000 and 100,000 miles or more, depending on your particular model. And if you have a timing chain rather than a belt, you may never have to worry about replacing it. Still, if you've checked the usual suspect without success, check for a failed timing belt or chain. The engine's crankshaft and camshaft are joined by a timing belt or chain through a series of sprockets. When this belt or chain brakes or wears out, or the tensioner fails, the crankshaft won't be able to rotate the camshaft anymore, making it impossible to start the engine. Checking for a failed timing belt or chain: On a vehicle fitted with a distributor, you can remove the distributor cap and try to fire up the engine. If the distributor rotor doesn't move, most likely your timing belt or chain, or one of the system components, has failed. On models with multiport fuel injection systems, sometimes it's possible to remove the timing belt or chain cover to check for camshaft movement while trying to start the engine. Or you may be able to remove the oil cap from the valve cover, or the cover itself if necessary, to check for valve movement while trying to start the engine. If there's no movement, it's time to check the belt, chain, or system components. If the camshaft rotates, you may still want to verify ignition timing. If the belt or chain has skipped some sprocket teeth, it may be difficult or impossible to start your engine. Consult your vehicle repair manual to check crankshaft and camshaft synchronization. A Few Unusual Additional Possibilities Of course, there are other model-specific components or systems that can prevent your vehicle from starting. Například: A faulty key fob or with a drained battery. Inertia fuel shut-off switch triggered during an accident or a jolt on the road. Faulty anti-theft system. Consult the repair manual for your specific make and model for help on these and other systems or components. Dealing With a Car That Won't Start To sum up, when your car won't start, begin your diagnostic with the most simple components or obvious potential problems, as in Diagnostics 1 and 2 at the beginning of the article: Make sure there's gas in the fuel tank. Verify your battery's state of charge. Make sure battery terminals are clean and tight. Check the battery and engine ground connections. Verify the fuel pump is energizing when turning the ignition key to On. Check for blown fuses. Then you can start checking the alternator, starter motor, ignition, fuel system pressure, and their circuits. Most of the time you'll be able to fix the problem yourself. Sometimes, you will need to replace a fuel pressure regulator, ignition coil, module, or fuel pump, or fix a vacuum leak. See the Resources below for diagnostic ideas if you have narrowed your problem down to a particular system. Resources on Starting System Faults Car Starter Problems? Five Starting-System Inspection Tips Car starter problems? Don't blame the starter motor yet. These 5 troubleshooting tips will help you find the culprit. Jak používat pokles napětí k odstraňování problémů se systémem startéru Testování poklesu napětí vám může pomoci najít problémová místa v obvodu startéru, než budete zbytečně vyměňovat součástky. Resources on Charging Circuit Faults Troubleshooting Alternator and Charging System Problems Diagnose alternator and charging system problems with this practical guide to get your car back on the road faster. How to Do a Voltage Drop Test on Your Charging System Voltage-drop test your charging system circuit before condemning your alternator. Resources on the Fuel System Jak testovat regulátor tlaku paliva Naučte se testovat regulátor tlaku paliva, abyste ušetřili peníze a čas při opravách automobilů. Resources for Dealing with the Crankshaft and Camshaft Sensors Jak otestovat snímač polohy klikového hřídele pomocí multimetru Odstraňte problémy s indukčním snímačem polohy klikového hřídele nebo snímačem polohy klikového hřídele typu Hallova efektu (CKP) pomocí digitálního multimetru. Test snímače polohy vačkového hřídele Test snímače polohy vačkového hřídele můžete provést doma pomocí digitálního multimetru a v případě potřeby pomocí několika běžných nástrojů. Můj motor nemá na cívce jiskru Pokud zapalovací systém vašeho auta nemá jiskru, několik jednoduchých testů vám pomůže najít závadu. Resources for Dealing With Battery Faults How to Test a Car Battery With a Multimeter or Hydrometer This guide will show you how to use a digital multimeter, hydrometer, and other simple tools to troubleshoot, inspect, and clean your battery if necessary. How to Do a Parasitic Battery Drain Test Find that parasitic battery drain that's causing your car battery problems whether you have a newer or older vehicle model. Tento obsah je přesný a pravdivý podle nejlepšího vědomí autora a nemá nahrazovat formální a individualizované rady od kvalifikovaného profesionála.
Často lze stav bez startu vysledovat až k závadě v palivovém systému. Pokud se váš motor přetáčí, ale odmítá nastartovat, proveďte tento jednoduchý test. Tento test vám může zjistit, zda problém souvisí s dodávkou paliva.
Pokud motor na několik sekund naskočí a poté zhasne, váš problém s největší pravděpodobností souvisí s palivem. Zkontrolujte palivový filtr, regulátor tlaku paliva a palivové čerpadlo, jak je uvedeno v následujících částech.
Následující video ukazuje, jak používat startovací kapalinu.
Nyní, když máte představu o tom, jaký systém je třeba prozkoumat, můžete začít zkoumat. Následujících deset oddílů pojednává o deseti nejčastějších závadách, které pravděpodobně budete řešit, když vaše auto odmítne nastartovat, a o tom, jak postupovat při kontrole každé potenciální závady.
1. Baterie je vybitá To je jeden z nejčastějších důvodů, proč auto nejde nastartovat. Autobaterie může vydržet až šest let v závislosti na údržbě a provozních podmínkách. Jeho životnost zkrátí například extrémní povětrnostní podmínky. Není však neobvyklé, že se baterie náhle vybije. Zkontrolujte připojení svorek baterie. Odstraňte korozi a ujistěte se, že jsou svorky těsné. Poté zkontrolujte hladinu elektrolytu, pokud má baterie odnímatelné kryty. Když auto odmítne nastartovat, ujistěte se, že je baterie dobře nabitá. Stav nabití můžete zkontrolovat pomocí digitálního multimetru (DMM). Kontrola stavu nabití baterie: Vypněte veškeré příslušenství, zavřete dveře a otevřete kapotu. Nastavte voltmetr na 20 V DC. Zapněte DMM a připojte černý kabel k zápornému (-) pólu baterie a červený ke kladnému (+) pólu baterie. Vaše baterie by měla mít alespoň 12,4 V; jinak nabijte baterii nebo ji nechte zkontrolovat v místním obchodě s autodíly. Pokud potřebujete baterii dobít, použijte pokud možno pomalé nabíjení. To pomůže obnovit stav baterie. Váš místní obchod s autodíly může zkontrolovat, zda je vaše baterie stále v pořádku. 2. Špatný motor nebo systém spouštěče Dalšími běžnými zdroji problémů jsou startér a jeho obvod. Tento systém může být na vině, pokud při pokusu o nastartování motoru uslyšíte pevné cvaknutí. Může být problém s elektromagnetem spouštěče, relé nebo spouštěcím motorem. V případě potřeby zkontrolujte obvod pomocí testu poklesu napětí. Viz Zdroje v dolní části tohoto příspěvku, kde najdete pomoc s tímto testem. Váš místní obchod s autodíly také zdarma zkontroluje startér, ale budete muset startér z vozidla vyjmout. 3. Faulty Alternator Along with a dead or bad battery, alternator issues are one of the most common reasons for a no-start condition. Usually, the charging system will turn on a warning light on the dashboard alerting you about a fault in the system. However, there are many reasons a charging system may fail to deliver a charge to the battery or electrical power to other systems in the vehicle. Points to check: Check for a loose or worn belt or a worn or damaged belt tensioner. Inspect the condition of the wiring and connectors. Have the alternator checked at your local auto parts store. Do an alternator circuit voltage drop test, if necessary. See the Resources section. Keep in mind that a corroded battery terminal could be a sign of an alternator overcharging the battery. If you don't want to do it, your local auto parts store will check the alternator for you. 4. Fuel Filter Clogged Most manufacturers recommend replacing the fuel filter every one or two years. Replace your fuel filter as recommended. Although many fuel filters include a bypass valve in case the filter clogs, not all come equipped with this valve. Besides, rust and other sediments in the fuel tank can make their way to the fuel filter and clog its filter element. Before giving out completely, a clogging fuel filter will give you one or more signs. For example, you may notice a lack of engine power at high speeds, difficulty starting the engine, or poor acceleration. Check your repair manual to inspect the fuel filter and system in your particular model, if necessary. If you suspect insufficient fuel reaching the injectors, do the quick fuel system delivery check as described in the second section of this post. 5. Faulty Fuel Pressure Regulator A fuel pressure regulator (FPR) limits the amount of pressure buildup in the system, typically to between 35 and 45 psi. Check your vehicle repair manual for your model specifications. But FPRs can fail. If the internal diaphragm begins to leak fuel into the intake manifold, pressure will drop, and the cylinders will be flooded with fuel, making the engine hard to start. Also, if too much raw fuel reaches the catalytic converter, the Check Engine Light (CEL) will begin to flash on your dashboard. If you suspect insufficient fuel reaching the injectors, do the quick fuel system delivery check as described in the "Pre-Diagnostic 2" section of this article above. You can perform a few FPR tests at home. Viz Zdroje section at the bottom of this article for some help. 6. Bad Fuel Pump Fuel pumps have a long service life. They can last 80,000 miles or more. If your fuel filter and fuel pressure regulator are fine, but you have a fuel issue, probably your fuel pump is bad. When turning the ignition key to the "On" position, before trying to start the engine, you should hear a buzzing sound for a couple of seconds. This is the sound of the fuel pump motor being activated to prime the fuel delivery system. If you don't hear this sound, it may be that: no voltage is reaching the fuel pump, the fuel pump fuse is blown, the fuel pump relay is bad, or the pump itself may have failed. To verify a fuel delivery issue, do the quick fuel system delivery check as described in the second diagnostic section near the top of this article. Also, check the repair manual for your particular model to see how to test the fuel pump, if necessary. 7. Faulty Ignition Coil or Module For the most part, ignition coils or modules are pretty reliable. Unlike spark plugs, wires, and distributor caps (depending on the model), an ignition coil or module doesn't require much attention. However, they can fail from time to time. The conditions under which they operate, like heat, vibration and other engine performance issues, can have an adverse effect on any of these components after many miles of operation. Older vehicle models used a single ignition coil and module to deliver a spark to the spark plugs. Newer models may use a module and one coil per spark plug. A failed coil or module in one of these models will certainly prevent the engine from starting. You can use a spark tester to verify the presence and condition of the spark. You can buy one at your local auto parts store. If possible, get an adjustable spark tester you can use in different vehicles. The Resources section at the bottom of this post, and your vehicle repair manual, can help you check an ignition coil or test for the presence of a spark in the ignition system. 8. Faulty Crankshaft or Camshaft Position Sensor The crankshaft position (CKP) sensor monitors engine speed, and the camshaft position (CMP) sensor tracks the position of the camshaft. The electronic control module (ECM), the car's computer, uses the signal from both sensors to control fuel injection operation, direct ignition, and, depending on vehicle model, the variable valve timing system. If any of these sensors fails, your car may fail to start. Sometimes, depending on the specific fault, a bad CKP or CMP will trigger the check engine light (CEL). Whether the CEL illuminates on your dashboard or not, it's a good idea to scan the computer memory for potential diagnostic trouble codes (DTCs) that can help you diagnose a no-start condition. If you don't have a scan tool, your local auto parts store may download DTCs for you without cost. Also, check your vehicle repair manual. And, within the Resources section at the bottom of this post, you'll find links to other posts to help you check these sensors yourself, if possible. 9. Major Vacuum Leak Major vacuum leaks are not common, but they definitely happen. A vacuum leak can make the air-fuel mixture too lean, preventing the engine from starting. A leak may come from a vacuum line, intake manifold gasket, throttle body gasket, leaking EGR valve gasket, power brake booster or positive crankcase ventilation (PCV) valve. Vacuum leaks can be tricky to find. You can visually inspect every vacuum hose and trace it with your hand, feeling for tears or damaged spots. Also, pay attention to hissing sounds that may indicate a leak. A leaking gasket is harder to detect, though, unless you have a smoke machine designed for this purpose. V případě potřeby nahlédněte do návodu k opravě vozidla. 10. Failed Timing Belt You won't see this type of failure often. Timing belts can last between 50,000 and 100,000 miles or more, depending on your particular model. And if you have a timing chain rather than a belt, you may never have to worry about replacing it. Still, if you've checked the usual suspect without success, check for a failed timing belt or chain. The engine's crankshaft and camshaft are joined by a timing belt or chain through a series of sprockets. When this belt or chain brakes or wears out, or the tensioner fails, the crankshaft won't be able to rotate the camshaft anymore, making it impossible to start the engine. Checking for a failed timing belt or chain: On a vehicle fitted with a distributor, you can remove the distributor cap and try to fire up the engine. If the distributor rotor doesn't move, most likely your timing belt or chain, or one of the system components, has failed. On models with multiport fuel injection systems, sometimes it's possible to remove the timing belt or chain cover to check for camshaft movement while trying to start the engine. Or you may be able to remove the oil cap from the valve cover, or the cover itself if necessary, to check for valve movement while trying to start the engine. If there's no movement, it's time to check the belt, chain, or system components. If the camshaft rotates, you may still want to verify ignition timing. If the belt or chain has skipped some sprocket teeth, it may be difficult or impossible to start your engine. Consult your vehicle repair manual to check crankshaft and camshaft synchronization. A Few Unusual Additional Possibilities Of course, there are other model-specific components or systems that can prevent your vehicle from starting. Například: A faulty key fob or with a drained battery. Inertia fuel shut-off switch triggered during an accident or a jolt on the road. Faulty anti-theft system. Consult the repair manual for your specific make and model for help on these and other systems or components. Dealing With a Car That Won't Start To sum up, when your car won't start, begin your diagnostic with the most simple components or obvious potential problems, as in Diagnostics 1 and 2 at the beginning of the article: Make sure there's gas in the fuel tank. Verify your battery's state of charge. Make sure battery terminals are clean and tight. Check the battery and engine ground connections. Verify the fuel pump is energizing when turning the ignition key to On. Check for blown fuses. Then you can start checking the alternator, starter motor, ignition, fuel system pressure, and their circuits. Most of the time you'll be able to fix the problem yourself. Sometimes, you will need to replace a fuel pressure regulator, ignition coil, module, or fuel pump, or fix a vacuum leak. See the Resources below for diagnostic ideas if you have narrowed your problem down to a particular system. Resources on Starting System Faults Car Starter Problems? Five Starting-System Inspection Tips Car starter problems? Don't blame the starter motor yet. These 5 troubleshooting tips will help you find the culprit. Jak používat pokles napětí k odstraňování problémů se systémem startéru Testování poklesu napětí vám může pomoci najít problémová místa v obvodu startéru, než budete zbytečně vyměňovat součástky. Resources on Charging Circuit Faults Troubleshooting Alternator and Charging System Problems Diagnose alternator and charging system problems with this practical guide to get your car back on the road faster. How to Do a Voltage Drop Test on Your Charging System Voltage-drop test your charging system circuit before condemning your alternator. Resources on the Fuel System Jak testovat regulátor tlaku paliva Naučte se testovat regulátor tlaku paliva, abyste ušetřili peníze a čas při opravách automobilů. Resources for Dealing with the Crankshaft and Camshaft Sensors Jak otestovat snímač polohy klikového hřídele pomocí multimetru Odstraňte problémy s indukčním snímačem polohy klikového hřídele nebo snímačem polohy klikového hřídele typu Hallova efektu (CKP) pomocí digitálního multimetru. Test snímače polohy vačkového hřídele Test snímače polohy vačkového hřídele můžete provést doma pomocí digitálního multimetru a v případě potřeby pomocí několika běžných nástrojů. Můj motor nemá na cívce jiskru Pokud zapalovací systém vašeho auta nemá jiskru, několik jednoduchých testů vám pomůže najít závadu. Resources for Dealing With Battery Faults How to Test a Car Battery With a Multimeter or Hydrometer This guide will show you how to use a digital multimeter, hydrometer, and other simple tools to troubleshoot, inspect, and clean your battery if necessary. How to Do a Parasitic Battery Drain Test Find that parasitic battery drain that's causing your car battery problems whether you have a newer or older vehicle model. Tento obsah je přesný a pravdivý podle nejlepšího vědomí autora a nemá nahrazovat formální a individualizované rady od kvalifikovaného profesionála.
To je jeden z nejčastějších důvodů, proč auto nejde nastartovat. Autobaterie může vydržet až šest let v závislosti na údržbě a provozních podmínkách. Jeho životnost zkrátí například extrémní povětrnostní podmínky.
Není však neobvyklé, že se baterie náhle vybije.
Zkontrolujte připojení svorek baterie. Odstraňte korozi a ujistěte se, že jsou svorky těsné. Poté zkontrolujte hladinu elektrolytu, pokud má baterie odnímatelné kryty.
Když auto odmítne nastartovat, ujistěte se, že je baterie dobře nabitá. Stav nabití můžete zkontrolovat pomocí digitálního multimetru (DMM).
Kontrola stavu nabití baterie:
Pokud potřebujete baterii dobít, použijte pokud možno pomalé nabíjení. To pomůže obnovit stav baterie.
Váš místní obchod s autodíly může zkontrolovat, zda je vaše baterie stále v pořádku.
2. Špatný motor nebo systém spouštěče Dalšími běžnými zdroji problémů jsou startér a jeho obvod. Tento systém může být na vině, pokud při pokusu o nastartování motoru uslyšíte pevné cvaknutí. Může být problém s elektromagnetem spouštěče, relé nebo spouštěcím motorem. V případě potřeby zkontrolujte obvod pomocí testu poklesu napětí. Viz Zdroje v dolní části tohoto příspěvku, kde najdete pomoc s tímto testem. Váš místní obchod s autodíly také zdarma zkontroluje startér, ale budete muset startér z vozidla vyjmout. 3. Faulty Alternator Along with a dead or bad battery, alternator issues are one of the most common reasons for a no-start condition. Usually, the charging system will turn on a warning light on the dashboard alerting you about a fault in the system. However, there are many reasons a charging system may fail to deliver a charge to the battery or electrical power to other systems in the vehicle. Points to check: Check for a loose or worn belt or a worn or damaged belt tensioner. Inspect the condition of the wiring and connectors. Have the alternator checked at your local auto parts store. Do an alternator circuit voltage drop test, if necessary. See the Resources section. Keep in mind that a corroded battery terminal could be a sign of an alternator overcharging the battery. If you don't want to do it, your local auto parts store will check the alternator for you. 4. Fuel Filter Clogged Most manufacturers recommend replacing the fuel filter every one or two years. Replace your fuel filter as recommended. Although many fuel filters include a bypass valve in case the filter clogs, not all come equipped with this valve. Besides, rust and other sediments in the fuel tank can make their way to the fuel filter and clog its filter element. Before giving out completely, a clogging fuel filter will give you one or more signs. For example, you may notice a lack of engine power at high speeds, difficulty starting the engine, or poor acceleration. Check your repair manual to inspect the fuel filter and system in your particular model, if necessary. If you suspect insufficient fuel reaching the injectors, do the quick fuel system delivery check as described in the second section of this post. 5. Faulty Fuel Pressure Regulator A fuel pressure regulator (FPR) limits the amount of pressure buildup in the system, typically to between 35 and 45 psi. Check your vehicle repair manual for your model specifications. But FPRs can fail. If the internal diaphragm begins to leak fuel into the intake manifold, pressure will drop, and the cylinders will be flooded with fuel, making the engine hard to start. Also, if too much raw fuel reaches the catalytic converter, the Check Engine Light (CEL) will begin to flash on your dashboard. If you suspect insufficient fuel reaching the injectors, do the quick fuel system delivery check as described in the "Pre-Diagnostic 2" section of this article above. You can perform a few FPR tests at home. Viz Zdroje section at the bottom of this article for some help. 6. Bad Fuel Pump Fuel pumps have a long service life. They can last 80,000 miles or more. If your fuel filter and fuel pressure regulator are fine, but you have a fuel issue, probably your fuel pump is bad. When turning the ignition key to the "On" position, before trying to start the engine, you should hear a buzzing sound for a couple of seconds. This is the sound of the fuel pump motor being activated to prime the fuel delivery system. If you don't hear this sound, it may be that: no voltage is reaching the fuel pump, the fuel pump fuse is blown, the fuel pump relay is bad, or the pump itself may have failed. To verify a fuel delivery issue, do the quick fuel system delivery check as described in the second diagnostic section near the top of this article. Also, check the repair manual for your particular model to see how to test the fuel pump, if necessary. 7. Faulty Ignition Coil or Module For the most part, ignition coils or modules are pretty reliable. Unlike spark plugs, wires, and distributor caps (depending on the model), an ignition coil or module doesn't require much attention. However, they can fail from time to time. The conditions under which they operate, like heat, vibration and other engine performance issues, can have an adverse effect on any of these components after many miles of operation. Older vehicle models used a single ignition coil and module to deliver a spark to the spark plugs. Newer models may use a module and one coil per spark plug. A failed coil or module in one of these models will certainly prevent the engine from starting. You can use a spark tester to verify the presence and condition of the spark. You can buy one at your local auto parts store. If possible, get an adjustable spark tester you can use in different vehicles. The Resources section at the bottom of this post, and your vehicle repair manual, can help you check an ignition coil or test for the presence of a spark in the ignition system. 8. Faulty Crankshaft or Camshaft Position Sensor The crankshaft position (CKP) sensor monitors engine speed, and the camshaft position (CMP) sensor tracks the position of the camshaft. The electronic control module (ECM), the car's computer, uses the signal from both sensors to control fuel injection operation, direct ignition, and, depending on vehicle model, the variable valve timing system. If any of these sensors fails, your car may fail to start. Sometimes, depending on the specific fault, a bad CKP or CMP will trigger the check engine light (CEL). Whether the CEL illuminates on your dashboard or not, it's a good idea to scan the computer memory for potential diagnostic trouble codes (DTCs) that can help you diagnose a no-start condition. If you don't have a scan tool, your local auto parts store may download DTCs for you without cost. Also, check your vehicle repair manual. And, within the Resources section at the bottom of this post, you'll find links to other posts to help you check these sensors yourself, if possible. 9. Major Vacuum Leak Major vacuum leaks are not common, but they definitely happen. A vacuum leak can make the air-fuel mixture too lean, preventing the engine from starting. A leak may come from a vacuum line, intake manifold gasket, throttle body gasket, leaking EGR valve gasket, power brake booster or positive crankcase ventilation (PCV) valve. Vacuum leaks can be tricky to find. You can visually inspect every vacuum hose and trace it with your hand, feeling for tears or damaged spots. Also, pay attention to hissing sounds that may indicate a leak. A leaking gasket is harder to detect, though, unless you have a smoke machine designed for this purpose. V případě potřeby nahlédněte do návodu k opravě vozidla. 10. Failed Timing Belt You won't see this type of failure often. Timing belts can last between 50,000 and 100,000 miles or more, depending on your particular model. And if you have a timing chain rather than a belt, you may never have to worry about replacing it. Still, if you've checked the usual suspect without success, check for a failed timing belt or chain. The engine's crankshaft and camshaft are joined by a timing belt or chain through a series of sprockets. When this belt or chain brakes or wears out, or the tensioner fails, the crankshaft won't be able to rotate the camshaft anymore, making it impossible to start the engine. Checking for a failed timing belt or chain: On a vehicle fitted with a distributor, you can remove the distributor cap and try to fire up the engine. If the distributor rotor doesn't move, most likely your timing belt or chain, or one of the system components, has failed. On models with multiport fuel injection systems, sometimes it's possible to remove the timing belt or chain cover to check for camshaft movement while trying to start the engine. Or you may be able to remove the oil cap from the valve cover, or the cover itself if necessary, to check for valve movement while trying to start the engine. If there's no movement, it's time to check the belt, chain, or system components. If the camshaft rotates, you may still want to verify ignition timing. If the belt or chain has skipped some sprocket teeth, it may be difficult or impossible to start your engine. Consult your vehicle repair manual to check crankshaft and camshaft synchronization. A Few Unusual Additional Possibilities Of course, there are other model-specific components or systems that can prevent your vehicle from starting. Například: A faulty key fob or with a drained battery. Inertia fuel shut-off switch triggered during an accident or a jolt on the road. Faulty anti-theft system. Consult the repair manual for your specific make and model for help on these and other systems or components. Dealing With a Car That Won't Start To sum up, when your car won't start, begin your diagnostic with the most simple components or obvious potential problems, as in Diagnostics 1 and 2 at the beginning of the article: Make sure there's gas in the fuel tank. Verify your battery's state of charge. Make sure battery terminals are clean and tight. Check the battery and engine ground connections. Verify the fuel pump is energizing when turning the ignition key to On. Check for blown fuses. Then you can start checking the alternator, starter motor, ignition, fuel system pressure, and their circuits. Most of the time you'll be able to fix the problem yourself. Sometimes, you will need to replace a fuel pressure regulator, ignition coil, module, or fuel pump, or fix a vacuum leak. See the Resources below for diagnostic ideas if you have narrowed your problem down to a particular system. Resources on Starting System Faults Car Starter Problems? Five Starting-System Inspection Tips Car starter problems? Don't blame the starter motor yet. These 5 troubleshooting tips will help you find the culprit. Jak používat pokles napětí k odstraňování problémů se systémem startéru Testování poklesu napětí vám může pomoci najít problémová místa v obvodu startéru, než budete zbytečně vyměňovat součástky. Resources on Charging Circuit Faults Troubleshooting Alternator and Charging System Problems Diagnose alternator and charging system problems with this practical guide to get your car back on the road faster. How to Do a Voltage Drop Test on Your Charging System Voltage-drop test your charging system circuit before condemning your alternator. Resources on the Fuel System Jak testovat regulátor tlaku paliva Naučte se testovat regulátor tlaku paliva, abyste ušetřili peníze a čas při opravách automobilů. Resources for Dealing with the Crankshaft and Camshaft Sensors Jak otestovat snímač polohy klikového hřídele pomocí multimetru Odstraňte problémy s indukčním snímačem polohy klikového hřídele nebo snímačem polohy klikového hřídele typu Hallova efektu (CKP) pomocí digitálního multimetru. Test snímače polohy vačkového hřídele Test snímače polohy vačkového hřídele můžete provést doma pomocí digitálního multimetru a v případě potřeby pomocí několika běžných nástrojů. Můj motor nemá na cívce jiskru Pokud zapalovací systém vašeho auta nemá jiskru, několik jednoduchých testů vám pomůže najít závadu. Resources for Dealing With Battery Faults How to Test a Car Battery With a Multimeter or Hydrometer This guide will show you how to use a digital multimeter, hydrometer, and other simple tools to troubleshoot, inspect, and clean your battery if necessary. How to Do a Parasitic Battery Drain Test Find that parasitic battery drain that's causing your car battery problems whether you have a newer or older vehicle model. Tento obsah je přesný a pravdivý podle nejlepšího vědomí autora a nemá nahrazovat formální a individualizované rady od kvalifikovaného profesionála.
Dalšími běžnými zdroji problémů jsou startér a jeho obvod. Tento systém může být na vině, pokud při pokusu o nastartování motoru uslyšíte pevné cvaknutí.
Může být problém s elektromagnetem spouštěče, relé nebo spouštěcím motorem. V případě potřeby zkontrolujte obvod pomocí testu poklesu napětí. Viz Zdroje v dolní části tohoto příspěvku, kde najdete pomoc s tímto testem.
Váš místní obchod s autodíly také zdarma zkontroluje startér, ale budete muset startér z vozidla vyjmout.
3. Faulty Alternator Along with a dead or bad battery, alternator issues are one of the most common reasons for a no-start condition. Usually, the charging system will turn on a warning light on the dashboard alerting you about a fault in the system. However, there are many reasons a charging system may fail to deliver a charge to the battery or electrical power to other systems in the vehicle. Points to check: Check for a loose or worn belt or a worn or damaged belt tensioner. Inspect the condition of the wiring and connectors. Have the alternator checked at your local auto parts store. Do an alternator circuit voltage drop test, if necessary. See the Resources section. Keep in mind that a corroded battery terminal could be a sign of an alternator overcharging the battery. If you don't want to do it, your local auto parts store will check the alternator for you. 4. Fuel Filter Clogged Most manufacturers recommend replacing the fuel filter every one or two years. Replace your fuel filter as recommended. Although many fuel filters include a bypass valve in case the filter clogs, not all come equipped with this valve. Besides, rust and other sediments in the fuel tank can make their way to the fuel filter and clog its filter element. Before giving out completely, a clogging fuel filter will give you one or more signs. For example, you may notice a lack of engine power at high speeds, difficulty starting the engine, or poor acceleration. Check your repair manual to inspect the fuel filter and system in your particular model, if necessary. If you suspect insufficient fuel reaching the injectors, do the quick fuel system delivery check as described in the second section of this post. 5. Faulty Fuel Pressure Regulator A fuel pressure regulator (FPR) limits the amount of pressure buildup in the system, typically to between 35 and 45 psi. Check your vehicle repair manual for your model specifications. But FPRs can fail. If the internal diaphragm begins to leak fuel into the intake manifold, pressure will drop, and the cylinders will be flooded with fuel, making the engine hard to start. Also, if too much raw fuel reaches the catalytic converter, the Check Engine Light (CEL) will begin to flash on your dashboard. If you suspect insufficient fuel reaching the injectors, do the quick fuel system delivery check as described in the "Pre-Diagnostic 2" section of this article above. You can perform a few FPR tests at home. Viz Zdroje section at the bottom of this article for some help. 6. Bad Fuel Pump Fuel pumps have a long service life. They can last 80,000 miles or more. If your fuel filter and fuel pressure regulator are fine, but you have a fuel issue, probably your fuel pump is bad. When turning the ignition key to the "On" position, before trying to start the engine, you should hear a buzzing sound for a couple of seconds. This is the sound of the fuel pump motor being activated to prime the fuel delivery system. If you don't hear this sound, it may be that: no voltage is reaching the fuel pump, the fuel pump fuse is blown, the fuel pump relay is bad, or the pump itself may have failed. To verify a fuel delivery issue, do the quick fuel system delivery check as described in the second diagnostic section near the top of this article. Also, check the repair manual for your particular model to see how to test the fuel pump, if necessary. 7. Faulty Ignition Coil or Module For the most part, ignition coils or modules are pretty reliable. Unlike spark plugs, wires, and distributor caps (depending on the model), an ignition coil or module doesn't require much attention. However, they can fail from time to time. The conditions under which they operate, like heat, vibration and other engine performance issues, can have an adverse effect on any of these components after many miles of operation. Older vehicle models used a single ignition coil and module to deliver a spark to the spark plugs. Newer models may use a module and one coil per spark plug. A failed coil or module in one of these models will certainly prevent the engine from starting. You can use a spark tester to verify the presence and condition of the spark. You can buy one at your local auto parts store. If possible, get an adjustable spark tester you can use in different vehicles. The Resources section at the bottom of this post, and your vehicle repair manual, can help you check an ignition coil or test for the presence of a spark in the ignition system. 8. Faulty Crankshaft or Camshaft Position Sensor The crankshaft position (CKP) sensor monitors engine speed, and the camshaft position (CMP) sensor tracks the position of the camshaft. The electronic control module (ECM), the car's computer, uses the signal from both sensors to control fuel injection operation, direct ignition, and, depending on vehicle model, the variable valve timing system. If any of these sensors fails, your car may fail to start. Sometimes, depending on the specific fault, a bad CKP or CMP will trigger the check engine light (CEL). Whether the CEL illuminates on your dashboard or not, it's a good idea to scan the computer memory for potential diagnostic trouble codes (DTCs) that can help you diagnose a no-start condition. If you don't have a scan tool, your local auto parts store may download DTCs for you without cost. Also, check your vehicle repair manual. And, within the Resources section at the bottom of this post, you'll find links to other posts to help you check these sensors yourself, if possible. 9. Major Vacuum Leak Major vacuum leaks are not common, but they definitely happen. A vacuum leak can make the air-fuel mixture too lean, preventing the engine from starting. A leak may come from a vacuum line, intake manifold gasket, throttle body gasket, leaking EGR valve gasket, power brake booster or positive crankcase ventilation (PCV) valve. Vacuum leaks can be tricky to find. You can visually inspect every vacuum hose and trace it with your hand, feeling for tears or damaged spots. Also, pay attention to hissing sounds that may indicate a leak. A leaking gasket is harder to detect, though, unless you have a smoke machine designed for this purpose. V případě potřeby nahlédněte do návodu k opravě vozidla. 10. Failed Timing Belt You won't see this type of failure often. Timing belts can last between 50,000 and 100,000 miles or more, depending on your particular model. And if you have a timing chain rather than a belt, you may never have to worry about replacing it. Still, if you've checked the usual suspect without success, check for a failed timing belt or chain. The engine's crankshaft and camshaft are joined by a timing belt or chain through a series of sprockets. When this belt or chain brakes or wears out, or the tensioner fails, the crankshaft won't be able to rotate the camshaft anymore, making it impossible to start the engine. Checking for a failed timing belt or chain: On a vehicle fitted with a distributor, you can remove the distributor cap and try to fire up the engine. If the distributor rotor doesn't move, most likely your timing belt or chain, or one of the system components, has failed. On models with multiport fuel injection systems, sometimes it's possible to remove the timing belt or chain cover to check for camshaft movement while trying to start the engine. Or you may be able to remove the oil cap from the valve cover, or the cover itself if necessary, to check for valve movement while trying to start the engine. If there's no movement, it's time to check the belt, chain, or system components. If the camshaft rotates, you may still want to verify ignition timing. If the belt or chain has skipped some sprocket teeth, it may be difficult or impossible to start your engine. Consult your vehicle repair manual to check crankshaft and camshaft synchronization. A Few Unusual Additional Possibilities Of course, there are other model-specific components or systems that can prevent your vehicle from starting. Například: A faulty key fob or with a drained battery. Inertia fuel shut-off switch triggered during an accident or a jolt on the road. Faulty anti-theft system. Consult the repair manual for your specific make and model for help on these and other systems or components. Dealing With a Car That Won't Start To sum up, when your car won't start, begin your diagnostic with the most simple components or obvious potential problems, as in Diagnostics 1 and 2 at the beginning of the article: Make sure there's gas in the fuel tank. Verify your battery's state of charge. Make sure battery terminals are clean and tight. Check the battery and engine ground connections. Verify the fuel pump is energizing when turning the ignition key to On. Check for blown fuses. Then you can start checking the alternator, starter motor, ignition, fuel system pressure, and their circuits. Most of the time you'll be able to fix the problem yourself. Sometimes, you will need to replace a fuel pressure regulator, ignition coil, module, or fuel pump, or fix a vacuum leak. See the Resources below for diagnostic ideas if you have narrowed your problem down to a particular system. Resources on Starting System Faults Car Starter Problems? Five Starting-System Inspection Tips Car starter problems? Don't blame the starter motor yet. These 5 troubleshooting tips will help you find the culprit. Jak používat pokles napětí k odstraňování problémů se systémem startéru Testování poklesu napětí vám může pomoci najít problémová místa v obvodu startéru, než budete zbytečně vyměňovat součástky. Resources on Charging Circuit Faults Troubleshooting Alternator and Charging System Problems Diagnose alternator and charging system problems with this practical guide to get your car back on the road faster. How to Do a Voltage Drop Test on Your Charging System Voltage-drop test your charging system circuit before condemning your alternator. Resources on the Fuel System Jak testovat regulátor tlaku paliva Naučte se testovat regulátor tlaku paliva, abyste ušetřili peníze a čas při opravách automobilů. Resources for Dealing with the Crankshaft and Camshaft Sensors Jak otestovat snímač polohy klikového hřídele pomocí multimetru Odstraňte problémy s indukčním snímačem polohy klikového hřídele nebo snímačem polohy klikového hřídele typu Hallova efektu (CKP) pomocí digitálního multimetru. Test snímače polohy vačkového hřídele Test snímače polohy vačkového hřídele můžete provést doma pomocí digitálního multimetru a v případě potřeby pomocí několika běžných nástrojů. Můj motor nemá na cívce jiskru Pokud zapalovací systém vašeho auta nemá jiskru, několik jednoduchých testů vám pomůže najít závadu. Resources for Dealing With Battery Faults How to Test a Car Battery With a Multimeter or Hydrometer This guide will show you how to use a digital multimeter, hydrometer, and other simple tools to troubleshoot, inspect, and clean your battery if necessary. How to Do a Parasitic Battery Drain Test Find that parasitic battery drain that's causing your car battery problems whether you have a newer or older vehicle model. Tento obsah je přesný a pravdivý podle nejlepšího vědomí autora a nemá nahrazovat formální a individualizované rady od kvalifikovaného profesionála.
Along with a dead or bad battery, alternator issues are one of the most common reasons for a no-start condition.
Usually, the charging system will turn on a warning light on the dashboard alerting you about a fault in the system. However, there are many reasons a charging system may fail to deliver a charge to the battery or electrical power to other systems in the vehicle.
Points to check:
Keep in mind that a corroded battery terminal could be a sign of an alternator overcharging the battery.
If you don't want to do it, your local auto parts store will check the alternator for you.
4. Fuel Filter Clogged Most manufacturers recommend replacing the fuel filter every one or two years. Replace your fuel filter as recommended. Although many fuel filters include a bypass valve in case the filter clogs, not all come equipped with this valve. Besides, rust and other sediments in the fuel tank can make their way to the fuel filter and clog its filter element. Before giving out completely, a clogging fuel filter will give you one or more signs. For example, you may notice a lack of engine power at high speeds, difficulty starting the engine, or poor acceleration. Check your repair manual to inspect the fuel filter and system in your particular model, if necessary. If you suspect insufficient fuel reaching the injectors, do the quick fuel system delivery check as described in the second section of this post. 5. Faulty Fuel Pressure Regulator A fuel pressure regulator (FPR) limits the amount of pressure buildup in the system, typically to between 35 and 45 psi. Check your vehicle repair manual for your model specifications. But FPRs can fail. If the internal diaphragm begins to leak fuel into the intake manifold, pressure will drop, and the cylinders will be flooded with fuel, making the engine hard to start. Also, if too much raw fuel reaches the catalytic converter, the Check Engine Light (CEL) will begin to flash on your dashboard. If you suspect insufficient fuel reaching the injectors, do the quick fuel system delivery check as described in the "Pre-Diagnostic 2" section of this article above. You can perform a few FPR tests at home. Viz Zdroje section at the bottom of this article for some help. 6. Bad Fuel Pump Fuel pumps have a long service life. They can last 80,000 miles or more. If your fuel filter and fuel pressure regulator are fine, but you have a fuel issue, probably your fuel pump is bad. When turning the ignition key to the "On" position, before trying to start the engine, you should hear a buzzing sound for a couple of seconds. This is the sound of the fuel pump motor being activated to prime the fuel delivery system. If you don't hear this sound, it may be that: no voltage is reaching the fuel pump, the fuel pump fuse is blown, the fuel pump relay is bad, or the pump itself may have failed. To verify a fuel delivery issue, do the quick fuel system delivery check as described in the second diagnostic section near the top of this article. Also, check the repair manual for your particular model to see how to test the fuel pump, if necessary. 7. Faulty Ignition Coil or Module For the most part, ignition coils or modules are pretty reliable. Unlike spark plugs, wires, and distributor caps (depending on the model), an ignition coil or module doesn't require much attention. However, they can fail from time to time. The conditions under which they operate, like heat, vibration and other engine performance issues, can have an adverse effect on any of these components after many miles of operation. Older vehicle models used a single ignition coil and module to deliver a spark to the spark plugs. Newer models may use a module and one coil per spark plug. A failed coil or module in one of these models will certainly prevent the engine from starting. You can use a spark tester to verify the presence and condition of the spark. You can buy one at your local auto parts store. If possible, get an adjustable spark tester you can use in different vehicles. The Resources section at the bottom of this post, and your vehicle repair manual, can help you check an ignition coil or test for the presence of a spark in the ignition system. 8. Faulty Crankshaft or Camshaft Position Sensor The crankshaft position (CKP) sensor monitors engine speed, and the camshaft position (CMP) sensor tracks the position of the camshaft. The electronic control module (ECM), the car's computer, uses the signal from both sensors to control fuel injection operation, direct ignition, and, depending on vehicle model, the variable valve timing system. If any of these sensors fails, your car may fail to start. Sometimes, depending on the specific fault, a bad CKP or CMP will trigger the check engine light (CEL). Whether the CEL illuminates on your dashboard or not, it's a good idea to scan the computer memory for potential diagnostic trouble codes (DTCs) that can help you diagnose a no-start condition. If you don't have a scan tool, your local auto parts store may download DTCs for you without cost. Also, check your vehicle repair manual. And, within the Resources section at the bottom of this post, you'll find links to other posts to help you check these sensors yourself, if possible. 9. Major Vacuum Leak Major vacuum leaks are not common, but they definitely happen. A vacuum leak can make the air-fuel mixture too lean, preventing the engine from starting. A leak may come from a vacuum line, intake manifold gasket, throttle body gasket, leaking EGR valve gasket, power brake booster or positive crankcase ventilation (PCV) valve. Vacuum leaks can be tricky to find. You can visually inspect every vacuum hose and trace it with your hand, feeling for tears or damaged spots. Also, pay attention to hissing sounds that may indicate a leak. A leaking gasket is harder to detect, though, unless you have a smoke machine designed for this purpose. V případě potřeby nahlédněte do návodu k opravě vozidla. 10. Failed Timing Belt You won't see this type of failure often. Timing belts can last between 50,000 and 100,000 miles or more, depending on your particular model. And if you have a timing chain rather than a belt, you may never have to worry about replacing it. Still, if you've checked the usual suspect without success, check for a failed timing belt or chain. The engine's crankshaft and camshaft are joined by a timing belt or chain through a series of sprockets. When this belt or chain brakes or wears out, or the tensioner fails, the crankshaft won't be able to rotate the camshaft anymore, making it impossible to start the engine. Checking for a failed timing belt or chain: On a vehicle fitted with a distributor, you can remove the distributor cap and try to fire up the engine. If the distributor rotor doesn't move, most likely your timing belt or chain, or one of the system components, has failed. On models with multiport fuel injection systems, sometimes it's possible to remove the timing belt or chain cover to check for camshaft movement while trying to start the engine. Or you may be able to remove the oil cap from the valve cover, or the cover itself if necessary, to check for valve movement while trying to start the engine. If there's no movement, it's time to check the belt, chain, or system components. If the camshaft rotates, you may still want to verify ignition timing. If the belt or chain has skipped some sprocket teeth, it may be difficult or impossible to start your engine. Consult your vehicle repair manual to check crankshaft and camshaft synchronization. A Few Unusual Additional Possibilities Of course, there are other model-specific components or systems that can prevent your vehicle from starting. Například: A faulty key fob or with a drained battery. Inertia fuel shut-off switch triggered during an accident or a jolt on the road. Faulty anti-theft system. Consult the repair manual for your specific make and model for help on these and other systems or components. Dealing With a Car That Won't Start To sum up, when your car won't start, begin your diagnostic with the most simple components or obvious potential problems, as in Diagnostics 1 and 2 at the beginning of the article: Make sure there's gas in the fuel tank. Verify your battery's state of charge. Make sure battery terminals are clean and tight. Check the battery and engine ground connections. Verify the fuel pump is energizing when turning the ignition key to On. Check for blown fuses. Then you can start checking the alternator, starter motor, ignition, fuel system pressure, and their circuits. Most of the time you'll be able to fix the problem yourself. Sometimes, you will need to replace a fuel pressure regulator, ignition coil, module, or fuel pump, or fix a vacuum leak. See the Resources below for diagnostic ideas if you have narrowed your problem down to a particular system. Resources on Starting System Faults Car Starter Problems? Five Starting-System Inspection Tips Car starter problems? Don't blame the starter motor yet. These 5 troubleshooting tips will help you find the culprit. Jak používat pokles napětí k odstraňování problémů se systémem startéru Testování poklesu napětí vám může pomoci najít problémová místa v obvodu startéru, než budete zbytečně vyměňovat součástky. Resources on Charging Circuit Faults Troubleshooting Alternator and Charging System Problems Diagnose alternator and charging system problems with this practical guide to get your car back on the road faster. How to Do a Voltage Drop Test on Your Charging System Voltage-drop test your charging system circuit before condemning your alternator. Resources on the Fuel System Jak testovat regulátor tlaku paliva Naučte se testovat regulátor tlaku paliva, abyste ušetřili peníze a čas při opravách automobilů. Resources for Dealing with the Crankshaft and Camshaft Sensors Jak otestovat snímač polohy klikového hřídele pomocí multimetru Odstraňte problémy s indukčním snímačem polohy klikového hřídele nebo snímačem polohy klikového hřídele typu Hallova efektu (CKP) pomocí digitálního multimetru. Test snímače polohy vačkového hřídele Test snímače polohy vačkového hřídele můžete provést doma pomocí digitálního multimetru a v případě potřeby pomocí několika běžných nástrojů. Můj motor nemá na cívce jiskru Pokud zapalovací systém vašeho auta nemá jiskru, několik jednoduchých testů vám pomůže najít závadu. Resources for Dealing With Battery Faults How to Test a Car Battery With a Multimeter or Hydrometer This guide will show you how to use a digital multimeter, hydrometer, and other simple tools to troubleshoot, inspect, and clean your battery if necessary. How to Do a Parasitic Battery Drain Test Find that parasitic battery drain that's causing your car battery problems whether you have a newer or older vehicle model. Tento obsah je přesný a pravdivý podle nejlepšího vědomí autora a nemá nahrazovat formální a individualizované rady od kvalifikovaného profesionála.
Most manufacturers recommend replacing the fuel filter every one or two years. Replace your fuel filter as recommended.
Although many fuel filters include a bypass valve in case the filter clogs, not all come equipped with this valve. Besides, rust and other sediments in the fuel tank can make their way to the fuel filter and clog its filter element.
Before giving out completely, a clogging fuel filter will give you one or more signs. For example, you may notice a lack of engine power at high speeds, difficulty starting the engine, or poor acceleration.
Check your repair manual to inspect the fuel filter and system in your particular model, if necessary.
If you suspect insufficient fuel reaching the injectors, do the quick fuel system delivery check as described in the second section of this post.
5. Faulty Fuel Pressure Regulator A fuel pressure regulator (FPR) limits the amount of pressure buildup in the system, typically to between 35 and 45 psi. Check your vehicle repair manual for your model specifications. But FPRs can fail. If the internal diaphragm begins to leak fuel into the intake manifold, pressure will drop, and the cylinders will be flooded with fuel, making the engine hard to start. Also, if too much raw fuel reaches the catalytic converter, the Check Engine Light (CEL) will begin to flash on your dashboard. If you suspect insufficient fuel reaching the injectors, do the quick fuel system delivery check as described in the "Pre-Diagnostic 2" section of this article above. You can perform a few FPR tests at home. Viz Zdroje section at the bottom of this article for some help. 6. Bad Fuel Pump Fuel pumps have a long service life. They can last 80,000 miles or more. If your fuel filter and fuel pressure regulator are fine, but you have a fuel issue, probably your fuel pump is bad. When turning the ignition key to the "On" position, before trying to start the engine, you should hear a buzzing sound for a couple of seconds. This is the sound of the fuel pump motor being activated to prime the fuel delivery system. If you don't hear this sound, it may be that: no voltage is reaching the fuel pump, the fuel pump fuse is blown, the fuel pump relay is bad, or the pump itself may have failed. To verify a fuel delivery issue, do the quick fuel system delivery check as described in the second diagnostic section near the top of this article. Also, check the repair manual for your particular model to see how to test the fuel pump, if necessary. 7. Faulty Ignition Coil or Module For the most part, ignition coils or modules are pretty reliable. Unlike spark plugs, wires, and distributor caps (depending on the model), an ignition coil or module doesn't require much attention. However, they can fail from time to time. The conditions under which they operate, like heat, vibration and other engine performance issues, can have an adverse effect on any of these components after many miles of operation. Older vehicle models used a single ignition coil and module to deliver a spark to the spark plugs. Newer models may use a module and one coil per spark plug. A failed coil or module in one of these models will certainly prevent the engine from starting. You can use a spark tester to verify the presence and condition of the spark. You can buy one at your local auto parts store. If possible, get an adjustable spark tester you can use in different vehicles. The Resources section at the bottom of this post, and your vehicle repair manual, can help you check an ignition coil or test for the presence of a spark in the ignition system. 8. Faulty Crankshaft or Camshaft Position Sensor The crankshaft position (CKP) sensor monitors engine speed, and the camshaft position (CMP) sensor tracks the position of the camshaft. The electronic control module (ECM), the car's computer, uses the signal from both sensors to control fuel injection operation, direct ignition, and, depending on vehicle model, the variable valve timing system. If any of these sensors fails, your car may fail to start. Sometimes, depending on the specific fault, a bad CKP or CMP will trigger the check engine light (CEL). Whether the CEL illuminates on your dashboard or not, it's a good idea to scan the computer memory for potential diagnostic trouble codes (DTCs) that can help you diagnose a no-start condition. If you don't have a scan tool, your local auto parts store may download DTCs for you without cost. Also, check your vehicle repair manual. And, within the Resources section at the bottom of this post, you'll find links to other posts to help you check these sensors yourself, if possible. 9. Major Vacuum Leak Major vacuum leaks are not common, but they definitely happen. A vacuum leak can make the air-fuel mixture too lean, preventing the engine from starting. A leak may come from a vacuum line, intake manifold gasket, throttle body gasket, leaking EGR valve gasket, power brake booster or positive crankcase ventilation (PCV) valve. Vacuum leaks can be tricky to find. You can visually inspect every vacuum hose and trace it with your hand, feeling for tears or damaged spots. Also, pay attention to hissing sounds that may indicate a leak. A leaking gasket is harder to detect, though, unless you have a smoke machine designed for this purpose. V případě potřeby nahlédněte do návodu k opravě vozidla. 10. Failed Timing Belt You won't see this type of failure often. Timing belts can last between 50,000 and 100,000 miles or more, depending on your particular model. And if you have a timing chain rather than a belt, you may never have to worry about replacing it. Still, if you've checked the usual suspect without success, check for a failed timing belt or chain. The engine's crankshaft and camshaft are joined by a timing belt or chain through a series of sprockets. When this belt or chain brakes or wears out, or the tensioner fails, the crankshaft won't be able to rotate the camshaft anymore, making it impossible to start the engine. Checking for a failed timing belt or chain: On a vehicle fitted with a distributor, you can remove the distributor cap and try to fire up the engine. If the distributor rotor doesn't move, most likely your timing belt or chain, or one of the system components, has failed. On models with multiport fuel injection systems, sometimes it's possible to remove the timing belt or chain cover to check for camshaft movement while trying to start the engine. Or you may be able to remove the oil cap from the valve cover, or the cover itself if necessary, to check for valve movement while trying to start the engine. If there's no movement, it's time to check the belt, chain, or system components. If the camshaft rotates, you may still want to verify ignition timing. If the belt or chain has skipped some sprocket teeth, it may be difficult or impossible to start your engine. Consult your vehicle repair manual to check crankshaft and camshaft synchronization. A Few Unusual Additional Possibilities Of course, there are other model-specific components or systems that can prevent your vehicle from starting. Například: A faulty key fob or with a drained battery. Inertia fuel shut-off switch triggered during an accident or a jolt on the road. Faulty anti-theft system. Consult the repair manual for your specific make and model for help on these and other systems or components. Dealing With a Car That Won't Start To sum up, when your car won't start, begin your diagnostic with the most simple components or obvious potential problems, as in Diagnostics 1 and 2 at the beginning of the article: Make sure there's gas in the fuel tank. Verify your battery's state of charge. Make sure battery terminals are clean and tight. Check the battery and engine ground connections. Verify the fuel pump is energizing when turning the ignition key to On. Check for blown fuses. Then you can start checking the alternator, starter motor, ignition, fuel system pressure, and their circuits. Most of the time you'll be able to fix the problem yourself. Sometimes, you will need to replace a fuel pressure regulator, ignition coil, module, or fuel pump, or fix a vacuum leak. See the Resources below for diagnostic ideas if you have narrowed your problem down to a particular system. Resources on Starting System Faults Car Starter Problems? Five Starting-System Inspection Tips Car starter problems? Don't blame the starter motor yet. These 5 troubleshooting tips will help you find the culprit. Jak používat pokles napětí k odstraňování problémů se systémem startéru Testování poklesu napětí vám může pomoci najít problémová místa v obvodu startéru, než budete zbytečně vyměňovat součástky. Resources on Charging Circuit Faults Troubleshooting Alternator and Charging System Problems Diagnose alternator and charging system problems with this practical guide to get your car back on the road faster. How to Do a Voltage Drop Test on Your Charging System Voltage-drop test your charging system circuit before condemning your alternator. Resources on the Fuel System Jak testovat regulátor tlaku paliva Naučte se testovat regulátor tlaku paliva, abyste ušetřili peníze a čas při opravách automobilů. Resources for Dealing with the Crankshaft and Camshaft Sensors Jak otestovat snímač polohy klikového hřídele pomocí multimetru Odstraňte problémy s indukčním snímačem polohy klikového hřídele nebo snímačem polohy klikového hřídele typu Hallova efektu (CKP) pomocí digitálního multimetru. Test snímače polohy vačkového hřídele Test snímače polohy vačkového hřídele můžete provést doma pomocí digitálního multimetru a v případě potřeby pomocí několika běžných nástrojů. Můj motor nemá na cívce jiskru Pokud zapalovací systém vašeho auta nemá jiskru, několik jednoduchých testů vám pomůže najít závadu. Resources for Dealing With Battery Faults How to Test a Car Battery With a Multimeter or Hydrometer This guide will show you how to use a digital multimeter, hydrometer, and other simple tools to troubleshoot, inspect, and clean your battery if necessary. How to Do a Parasitic Battery Drain Test Find that parasitic battery drain that's causing your car battery problems whether you have a newer or older vehicle model. Tento obsah je přesný a pravdivý podle nejlepšího vědomí autora a nemá nahrazovat formální a individualizované rady od kvalifikovaného profesionála.
A fuel pressure regulator (FPR) limits the amount of pressure buildup in the system, typically to between 35 and 45 psi. Check your vehicle repair manual for your model specifications.
But FPRs can fail. If the internal diaphragm begins to leak fuel into the intake manifold, pressure will drop, and the cylinders will be flooded with fuel, making the engine hard to start.
Also, if too much raw fuel reaches the catalytic converter, the Check Engine Light (CEL) will begin to flash on your dashboard.
If you suspect insufficient fuel reaching the injectors, do the quick fuel system delivery check as described in the "Pre-Diagnostic 2" section of this article above.
You can perform a few FPR tests at home. Viz Zdroje section at the bottom of this article for some help.
6. Bad Fuel Pump Fuel pumps have a long service life. They can last 80,000 miles or more. If your fuel filter and fuel pressure regulator are fine, but you have a fuel issue, probably your fuel pump is bad. When turning the ignition key to the "On" position, before trying to start the engine, you should hear a buzzing sound for a couple of seconds. This is the sound of the fuel pump motor being activated to prime the fuel delivery system. If you don't hear this sound, it may be that: no voltage is reaching the fuel pump, the fuel pump fuse is blown, the fuel pump relay is bad, or the pump itself may have failed. To verify a fuel delivery issue, do the quick fuel system delivery check as described in the second diagnostic section near the top of this article. Also, check the repair manual for your particular model to see how to test the fuel pump, if necessary. 7. Faulty Ignition Coil or Module For the most part, ignition coils or modules are pretty reliable. Unlike spark plugs, wires, and distributor caps (depending on the model), an ignition coil or module doesn't require much attention. However, they can fail from time to time. The conditions under which they operate, like heat, vibration and other engine performance issues, can have an adverse effect on any of these components after many miles of operation. Older vehicle models used a single ignition coil and module to deliver a spark to the spark plugs. Newer models may use a module and one coil per spark plug. A failed coil or module in one of these models will certainly prevent the engine from starting. You can use a spark tester to verify the presence and condition of the spark. You can buy one at your local auto parts store. If possible, get an adjustable spark tester you can use in different vehicles. The Resources section at the bottom of this post, and your vehicle repair manual, can help you check an ignition coil or test for the presence of a spark in the ignition system. 8. Faulty Crankshaft or Camshaft Position Sensor The crankshaft position (CKP) sensor monitors engine speed, and the camshaft position (CMP) sensor tracks the position of the camshaft. The electronic control module (ECM), the car's computer, uses the signal from both sensors to control fuel injection operation, direct ignition, and, depending on vehicle model, the variable valve timing system. If any of these sensors fails, your car may fail to start. Sometimes, depending on the specific fault, a bad CKP or CMP will trigger the check engine light (CEL). Whether the CEL illuminates on your dashboard or not, it's a good idea to scan the computer memory for potential diagnostic trouble codes (DTCs) that can help you diagnose a no-start condition. If you don't have a scan tool, your local auto parts store may download DTCs for you without cost. Also, check your vehicle repair manual. And, within the Resources section at the bottom of this post, you'll find links to other posts to help you check these sensors yourself, if possible. 9. Major Vacuum Leak Major vacuum leaks are not common, but they definitely happen. A vacuum leak can make the air-fuel mixture too lean, preventing the engine from starting. A leak may come from a vacuum line, intake manifold gasket, throttle body gasket, leaking EGR valve gasket, power brake booster or positive crankcase ventilation (PCV) valve. Vacuum leaks can be tricky to find. You can visually inspect every vacuum hose and trace it with your hand, feeling for tears or damaged spots. Also, pay attention to hissing sounds that may indicate a leak. A leaking gasket is harder to detect, though, unless you have a smoke machine designed for this purpose. V případě potřeby nahlédněte do návodu k opravě vozidla. 10. Failed Timing Belt You won't see this type of failure often. Timing belts can last between 50,000 and 100,000 miles or more, depending on your particular model. And if you have a timing chain rather than a belt, you may never have to worry about replacing it. Still, if you've checked the usual suspect without success, check for a failed timing belt or chain. The engine's crankshaft and camshaft are joined by a timing belt or chain through a series of sprockets. When this belt or chain brakes or wears out, or the tensioner fails, the crankshaft won't be able to rotate the camshaft anymore, making it impossible to start the engine. Checking for a failed timing belt or chain: On a vehicle fitted with a distributor, you can remove the distributor cap and try to fire up the engine. If the distributor rotor doesn't move, most likely your timing belt or chain, or one of the system components, has failed. On models with multiport fuel injection systems, sometimes it's possible to remove the timing belt or chain cover to check for camshaft movement while trying to start the engine. Or you may be able to remove the oil cap from the valve cover, or the cover itself if necessary, to check for valve movement while trying to start the engine. If there's no movement, it's time to check the belt, chain, or system components. If the camshaft rotates, you may still want to verify ignition timing. If the belt or chain has skipped some sprocket teeth, it may be difficult or impossible to start your engine. Consult your vehicle repair manual to check crankshaft and camshaft synchronization. A Few Unusual Additional Possibilities Of course, there are other model-specific components or systems that can prevent your vehicle from starting. Například: A faulty key fob or with a drained battery. Inertia fuel shut-off switch triggered during an accident or a jolt on the road. Faulty anti-theft system. Consult the repair manual for your specific make and model for help on these and other systems or components. Dealing With a Car That Won't Start To sum up, when your car won't start, begin your diagnostic with the most simple components or obvious potential problems, as in Diagnostics 1 and 2 at the beginning of the article: Make sure there's gas in the fuel tank. Verify your battery's state of charge. Make sure battery terminals are clean and tight. Check the battery and engine ground connections. Verify the fuel pump is energizing when turning the ignition key to On. Check for blown fuses. Then you can start checking the alternator, starter motor, ignition, fuel system pressure, and their circuits. Most of the time you'll be able to fix the problem yourself. Sometimes, you will need to replace a fuel pressure regulator, ignition coil, module, or fuel pump, or fix a vacuum leak. See the Resources below for diagnostic ideas if you have narrowed your problem down to a particular system. Resources on Starting System Faults Car Starter Problems? Five Starting-System Inspection Tips Car starter problems? Don't blame the starter motor yet. These 5 troubleshooting tips will help you find the culprit. Jak používat pokles napětí k odstraňování problémů se systémem startéru Testování poklesu napětí vám může pomoci najít problémová místa v obvodu startéru, než budete zbytečně vyměňovat součástky. Resources on Charging Circuit Faults Troubleshooting Alternator and Charging System Problems Diagnose alternator and charging system problems with this practical guide to get your car back on the road faster. How to Do a Voltage Drop Test on Your Charging System Voltage-drop test your charging system circuit before condemning your alternator. Resources on the Fuel System Jak testovat regulátor tlaku paliva Naučte se testovat regulátor tlaku paliva, abyste ušetřili peníze a čas při opravách automobilů. Resources for Dealing with the Crankshaft and Camshaft Sensors Jak otestovat snímač polohy klikového hřídele pomocí multimetru Odstraňte problémy s indukčním snímačem polohy klikového hřídele nebo snímačem polohy klikového hřídele typu Hallova efektu (CKP) pomocí digitálního multimetru. Test snímače polohy vačkového hřídele Test snímače polohy vačkového hřídele můžete provést doma pomocí digitálního multimetru a v případě potřeby pomocí několika běžných nástrojů. Můj motor nemá na cívce jiskru Pokud zapalovací systém vašeho auta nemá jiskru, několik jednoduchých testů vám pomůže najít závadu. Resources for Dealing With Battery Faults How to Test a Car Battery With a Multimeter or Hydrometer This guide will show you how to use a digital multimeter, hydrometer, and other simple tools to troubleshoot, inspect, and clean your battery if necessary. How to Do a Parasitic Battery Drain Test Find that parasitic battery drain that's causing your car battery problems whether you have a newer or older vehicle model. Tento obsah je přesný a pravdivý podle nejlepšího vědomí autora a nemá nahrazovat formální a individualizované rady od kvalifikovaného profesionála.
Fuel pumps have a long service life. They can last 80,000 miles or more. If your fuel filter and fuel pressure regulator are fine, but you have a fuel issue, probably your fuel pump is bad.
When turning the ignition key to the "On" position, before trying to start the engine, you should hear a buzzing sound for a couple of seconds. This is the sound of the fuel pump motor being activated to prime the fuel delivery system.
If you don't hear this sound, it may be that:
To verify a fuel delivery issue, do the quick fuel system delivery check as described in the second diagnostic section near the top of this article.
Also, check the repair manual for your particular model to see how to test the fuel pump, if necessary.
7. Faulty Ignition Coil or Module For the most part, ignition coils or modules are pretty reliable. Unlike spark plugs, wires, and distributor caps (depending on the model), an ignition coil or module doesn't require much attention. However, they can fail from time to time. The conditions under which they operate, like heat, vibration and other engine performance issues, can have an adverse effect on any of these components after many miles of operation. Older vehicle models used a single ignition coil and module to deliver a spark to the spark plugs. Newer models may use a module and one coil per spark plug. A failed coil or module in one of these models will certainly prevent the engine from starting. You can use a spark tester to verify the presence and condition of the spark. You can buy one at your local auto parts store. If possible, get an adjustable spark tester you can use in different vehicles. The Resources section at the bottom of this post, and your vehicle repair manual, can help you check an ignition coil or test for the presence of a spark in the ignition system. 8. Faulty Crankshaft or Camshaft Position Sensor The crankshaft position (CKP) sensor monitors engine speed, and the camshaft position (CMP) sensor tracks the position of the camshaft. The electronic control module (ECM), the car's computer, uses the signal from both sensors to control fuel injection operation, direct ignition, and, depending on vehicle model, the variable valve timing system. If any of these sensors fails, your car may fail to start. Sometimes, depending on the specific fault, a bad CKP or CMP will trigger the check engine light (CEL). Whether the CEL illuminates on your dashboard or not, it's a good idea to scan the computer memory for potential diagnostic trouble codes (DTCs) that can help you diagnose a no-start condition. If you don't have a scan tool, your local auto parts store may download DTCs for you without cost. Also, check your vehicle repair manual. And, within the Resources section at the bottom of this post, you'll find links to other posts to help you check these sensors yourself, if possible. 9. Major Vacuum Leak Major vacuum leaks are not common, but they definitely happen. A vacuum leak can make the air-fuel mixture too lean, preventing the engine from starting. A leak may come from a vacuum line, intake manifold gasket, throttle body gasket, leaking EGR valve gasket, power brake booster or positive crankcase ventilation (PCV) valve. Vacuum leaks can be tricky to find. You can visually inspect every vacuum hose and trace it with your hand, feeling for tears or damaged spots. Also, pay attention to hissing sounds that may indicate a leak. A leaking gasket is harder to detect, though, unless you have a smoke machine designed for this purpose. V případě potřeby nahlédněte do návodu k opravě vozidla. 10. Failed Timing Belt You won't see this type of failure often. Timing belts can last between 50,000 and 100,000 miles or more, depending on your particular model. And if you have a timing chain rather than a belt, you may never have to worry about replacing it. Still, if you've checked the usual suspect without success, check for a failed timing belt or chain. The engine's crankshaft and camshaft are joined by a timing belt or chain through a series of sprockets. When this belt or chain brakes or wears out, or the tensioner fails, the crankshaft won't be able to rotate the camshaft anymore, making it impossible to start the engine. Checking for a failed timing belt or chain: On a vehicle fitted with a distributor, you can remove the distributor cap and try to fire up the engine. If the distributor rotor doesn't move, most likely your timing belt or chain, or one of the system components, has failed. On models with multiport fuel injection systems, sometimes it's possible to remove the timing belt or chain cover to check for camshaft movement while trying to start the engine. Or you may be able to remove the oil cap from the valve cover, or the cover itself if necessary, to check for valve movement while trying to start the engine. If there's no movement, it's time to check the belt, chain, or system components. If the camshaft rotates, you may still want to verify ignition timing. If the belt or chain has skipped some sprocket teeth, it may be difficult or impossible to start your engine. Consult your vehicle repair manual to check crankshaft and camshaft synchronization. A Few Unusual Additional Possibilities Of course, there are other model-specific components or systems that can prevent your vehicle from starting. Například: A faulty key fob or with a drained battery. Inertia fuel shut-off switch triggered during an accident or a jolt on the road. Faulty anti-theft system. Consult the repair manual for your specific make and model for help on these and other systems or components. Dealing With a Car That Won't Start To sum up, when your car won't start, begin your diagnostic with the most simple components or obvious potential problems, as in Diagnostics 1 and 2 at the beginning of the article: Make sure there's gas in the fuel tank. Verify your battery's state of charge. Make sure battery terminals are clean and tight. Check the battery and engine ground connections. Verify the fuel pump is energizing when turning the ignition key to On. Check for blown fuses. Then you can start checking the alternator, starter motor, ignition, fuel system pressure, and their circuits. Most of the time you'll be able to fix the problem yourself. Sometimes, you will need to replace a fuel pressure regulator, ignition coil, module, or fuel pump, or fix a vacuum leak. See the Resources below for diagnostic ideas if you have narrowed your problem down to a particular system. Resources on Starting System Faults Car Starter Problems? Five Starting-System Inspection Tips Car starter problems? Don't blame the starter motor yet. These 5 troubleshooting tips will help you find the culprit. Jak používat pokles napětí k odstraňování problémů se systémem startéru Testování poklesu napětí vám může pomoci najít problémová místa v obvodu startéru, než budete zbytečně vyměňovat součástky. Resources on Charging Circuit Faults Troubleshooting Alternator and Charging System Problems Diagnose alternator and charging system problems with this practical guide to get your car back on the road faster. How to Do a Voltage Drop Test on Your Charging System Voltage-drop test your charging system circuit before condemning your alternator. Resources on the Fuel System Jak testovat regulátor tlaku paliva Naučte se testovat regulátor tlaku paliva, abyste ušetřili peníze a čas při opravách automobilů. Resources for Dealing with the Crankshaft and Camshaft Sensors Jak otestovat snímač polohy klikového hřídele pomocí multimetru Odstraňte problémy s indukčním snímačem polohy klikového hřídele nebo snímačem polohy klikového hřídele typu Hallova efektu (CKP) pomocí digitálního multimetru. Test snímače polohy vačkového hřídele Test snímače polohy vačkového hřídele můžete provést doma pomocí digitálního multimetru a v případě potřeby pomocí několika běžných nástrojů. Můj motor nemá na cívce jiskru Pokud zapalovací systém vašeho auta nemá jiskru, několik jednoduchých testů vám pomůže najít závadu. Resources for Dealing With Battery Faults How to Test a Car Battery With a Multimeter or Hydrometer This guide will show you how to use a digital multimeter, hydrometer, and other simple tools to troubleshoot, inspect, and clean your battery if necessary. How to Do a Parasitic Battery Drain Test Find that parasitic battery drain that's causing your car battery problems whether you have a newer or older vehicle model. Tento obsah je přesný a pravdivý podle nejlepšího vědomí autora a nemá nahrazovat formální a individualizované rady od kvalifikovaného profesionála.
For the most part, ignition coils or modules are pretty reliable. Unlike spark plugs, wires, and distributor caps (depending on the model), an ignition coil or module doesn't require much attention.
However, they can fail from time to time. The conditions under which they operate, like heat, vibration and other engine performance issues, can have an adverse effect on any of these components after many miles of operation.
Older vehicle models used a single ignition coil and module to deliver a spark to the spark plugs. Newer models may use a module and one coil per spark plug. A failed coil or module in one of these models will certainly prevent the engine from starting.
You can use a spark tester to verify the presence and condition of the spark. You can buy one at your local auto parts store. If possible, get an adjustable spark tester you can use in different vehicles.
The Resources section at the bottom of this post, and your vehicle repair manual, can help you check an ignition coil or test for the presence of a spark in the ignition system.
8. Faulty Crankshaft or Camshaft Position Sensor The crankshaft position (CKP) sensor monitors engine speed, and the camshaft position (CMP) sensor tracks the position of the camshaft. The electronic control module (ECM), the car's computer, uses the signal from both sensors to control fuel injection operation, direct ignition, and, depending on vehicle model, the variable valve timing system. If any of these sensors fails, your car may fail to start. Sometimes, depending on the specific fault, a bad CKP or CMP will trigger the check engine light (CEL). Whether the CEL illuminates on your dashboard or not, it's a good idea to scan the computer memory for potential diagnostic trouble codes (DTCs) that can help you diagnose a no-start condition. If you don't have a scan tool, your local auto parts store may download DTCs for you without cost. Also, check your vehicle repair manual. And, within the Resources section at the bottom of this post, you'll find links to other posts to help you check these sensors yourself, if possible. 9. Major Vacuum Leak Major vacuum leaks are not common, but they definitely happen. A vacuum leak can make the air-fuel mixture too lean, preventing the engine from starting. A leak may come from a vacuum line, intake manifold gasket, throttle body gasket, leaking EGR valve gasket, power brake booster or positive crankcase ventilation (PCV) valve. Vacuum leaks can be tricky to find. You can visually inspect every vacuum hose and trace it with your hand, feeling for tears or damaged spots. Also, pay attention to hissing sounds that may indicate a leak. A leaking gasket is harder to detect, though, unless you have a smoke machine designed for this purpose. V případě potřeby nahlédněte do návodu k opravě vozidla. 10. Failed Timing Belt You won't see this type of failure often. Timing belts can last between 50,000 and 100,000 miles or more, depending on your particular model. And if you have a timing chain rather than a belt, you may never have to worry about replacing it. Still, if you've checked the usual suspect without success, check for a failed timing belt or chain. The engine's crankshaft and camshaft are joined by a timing belt or chain through a series of sprockets. When this belt or chain brakes or wears out, or the tensioner fails, the crankshaft won't be able to rotate the camshaft anymore, making it impossible to start the engine. Checking for a failed timing belt or chain: On a vehicle fitted with a distributor, you can remove the distributor cap and try to fire up the engine. If the distributor rotor doesn't move, most likely your timing belt or chain, or one of the system components, has failed. On models with multiport fuel injection systems, sometimes it's possible to remove the timing belt or chain cover to check for camshaft movement while trying to start the engine. Or you may be able to remove the oil cap from the valve cover, or the cover itself if necessary, to check for valve movement while trying to start the engine. If there's no movement, it's time to check the belt, chain, or system components. If the camshaft rotates, you may still want to verify ignition timing. If the belt or chain has skipped some sprocket teeth, it may be difficult or impossible to start your engine. Consult your vehicle repair manual to check crankshaft and camshaft synchronization. A Few Unusual Additional Possibilities Of course, there are other model-specific components or systems that can prevent your vehicle from starting. Například: A faulty key fob or with a drained battery. Inertia fuel shut-off switch triggered during an accident or a jolt on the road. Faulty anti-theft system. Consult the repair manual for your specific make and model for help on these and other systems or components. Dealing With a Car That Won't Start To sum up, when your car won't start, begin your diagnostic with the most simple components or obvious potential problems, as in Diagnostics 1 and 2 at the beginning of the article: Make sure there's gas in the fuel tank. Verify your battery's state of charge. Make sure battery terminals are clean and tight. Check the battery and engine ground connections. Verify the fuel pump is energizing when turning the ignition key to On. Check for blown fuses. Then you can start checking the alternator, starter motor, ignition, fuel system pressure, and their circuits. Most of the time you'll be able to fix the problem yourself. Sometimes, you will need to replace a fuel pressure regulator, ignition coil, module, or fuel pump, or fix a vacuum leak. See the Resources below for diagnostic ideas if you have narrowed your problem down to a particular system. Resources on Starting System Faults Car Starter Problems? Five Starting-System Inspection Tips Car starter problems? Don't blame the starter motor yet. These 5 troubleshooting tips will help you find the culprit. Jak používat pokles napětí k odstraňování problémů se systémem startéru Testování poklesu napětí vám může pomoci najít problémová místa v obvodu startéru, než budete zbytečně vyměňovat součástky. Resources on Charging Circuit Faults Troubleshooting Alternator and Charging System Problems Diagnose alternator and charging system problems with this practical guide to get your car back on the road faster. How to Do a Voltage Drop Test on Your Charging System Voltage-drop test your charging system circuit before condemning your alternator. Resources on the Fuel System Jak testovat regulátor tlaku paliva Naučte se testovat regulátor tlaku paliva, abyste ušetřili peníze a čas při opravách automobilů. Resources for Dealing with the Crankshaft and Camshaft Sensors Jak otestovat snímač polohy klikového hřídele pomocí multimetru Odstraňte problémy s indukčním snímačem polohy klikového hřídele nebo snímačem polohy klikového hřídele typu Hallova efektu (CKP) pomocí digitálního multimetru. Test snímače polohy vačkového hřídele Test snímače polohy vačkového hřídele můžete provést doma pomocí digitálního multimetru a v případě potřeby pomocí několika běžných nástrojů. Můj motor nemá na cívce jiskru Pokud zapalovací systém vašeho auta nemá jiskru, několik jednoduchých testů vám pomůže najít závadu. Resources for Dealing With Battery Faults How to Test a Car Battery With a Multimeter or Hydrometer This guide will show you how to use a digital multimeter, hydrometer, and other simple tools to troubleshoot, inspect, and clean your battery if necessary. How to Do a Parasitic Battery Drain Test Find that parasitic battery drain that's causing your car battery problems whether you have a newer or older vehicle model. Tento obsah je přesný a pravdivý podle nejlepšího vědomí autora a nemá nahrazovat formální a individualizované rady od kvalifikovaného profesionála.
The crankshaft position (CKP) sensor monitors engine speed, and the camshaft position (CMP) sensor tracks the position of the camshaft.
The electronic control module (ECM), the car's computer, uses the signal from both sensors to control fuel injection operation, direct ignition, and, depending on vehicle model, the variable valve timing system.
If any of these sensors fails, your car may fail to start.
Sometimes, depending on the specific fault, a bad CKP or CMP will trigger the check engine light (CEL). Whether the CEL illuminates on your dashboard or not, it's a good idea to scan the computer memory for potential diagnostic trouble codes (DTCs) that can help you diagnose a no-start condition.
If you don't have a scan tool, your local auto parts store may download DTCs for you without cost.
Also, check your vehicle repair manual. And, within the Resources section at the bottom of this post, you'll find links to other posts to help you check these sensors yourself, if possible.
9. Major Vacuum Leak Major vacuum leaks are not common, but they definitely happen. A vacuum leak can make the air-fuel mixture too lean, preventing the engine from starting. A leak may come from a vacuum line, intake manifold gasket, throttle body gasket, leaking EGR valve gasket, power brake booster or positive crankcase ventilation (PCV) valve. Vacuum leaks can be tricky to find. You can visually inspect every vacuum hose and trace it with your hand, feeling for tears or damaged spots. Also, pay attention to hissing sounds that may indicate a leak. A leaking gasket is harder to detect, though, unless you have a smoke machine designed for this purpose. V případě potřeby nahlédněte do návodu k opravě vozidla. 10. Failed Timing Belt You won't see this type of failure often. Timing belts can last between 50,000 and 100,000 miles or more, depending on your particular model. And if you have a timing chain rather than a belt, you may never have to worry about replacing it. Still, if you've checked the usual suspect without success, check for a failed timing belt or chain. The engine's crankshaft and camshaft are joined by a timing belt or chain through a series of sprockets. When this belt or chain brakes or wears out, or the tensioner fails, the crankshaft won't be able to rotate the camshaft anymore, making it impossible to start the engine. Checking for a failed timing belt or chain: On a vehicle fitted with a distributor, you can remove the distributor cap and try to fire up the engine. If the distributor rotor doesn't move, most likely your timing belt or chain, or one of the system components, has failed. On models with multiport fuel injection systems, sometimes it's possible to remove the timing belt or chain cover to check for camshaft movement while trying to start the engine. Or you may be able to remove the oil cap from the valve cover, or the cover itself if necessary, to check for valve movement while trying to start the engine. If there's no movement, it's time to check the belt, chain, or system components. If the camshaft rotates, you may still want to verify ignition timing. If the belt or chain has skipped some sprocket teeth, it may be difficult or impossible to start your engine. Consult your vehicle repair manual to check crankshaft and camshaft synchronization. A Few Unusual Additional Possibilities Of course, there are other model-specific components or systems that can prevent your vehicle from starting. Například: A faulty key fob or with a drained battery. Inertia fuel shut-off switch triggered during an accident or a jolt on the road. Faulty anti-theft system. Consult the repair manual for your specific make and model for help on these and other systems or components. Dealing With a Car That Won't Start To sum up, when your car won't start, begin your diagnostic with the most simple components or obvious potential problems, as in Diagnostics 1 and 2 at the beginning of the article: Make sure there's gas in the fuel tank. Verify your battery's state of charge. Make sure battery terminals are clean and tight. Check the battery and engine ground connections. Verify the fuel pump is energizing when turning the ignition key to On. Check for blown fuses. Then you can start checking the alternator, starter motor, ignition, fuel system pressure, and their circuits. Most of the time you'll be able to fix the problem yourself. Sometimes, you will need to replace a fuel pressure regulator, ignition coil, module, or fuel pump, or fix a vacuum leak. See the Resources below for diagnostic ideas if you have narrowed your problem down to a particular system. Resources on Starting System Faults Car Starter Problems? Five Starting-System Inspection Tips Car starter problems? Don't blame the starter motor yet. These 5 troubleshooting tips will help you find the culprit. Jak používat pokles napětí k odstraňování problémů se systémem startéru Testování poklesu napětí vám může pomoci najít problémová místa v obvodu startéru, než budete zbytečně vyměňovat součástky. Resources on Charging Circuit Faults Troubleshooting Alternator and Charging System Problems Diagnose alternator and charging system problems with this practical guide to get your car back on the road faster. How to Do a Voltage Drop Test on Your Charging System Voltage-drop test your charging system circuit before condemning your alternator. Resources on the Fuel System Jak testovat regulátor tlaku paliva Naučte se testovat regulátor tlaku paliva, abyste ušetřili peníze a čas při opravách automobilů. Resources for Dealing with the Crankshaft and Camshaft Sensors Jak otestovat snímač polohy klikového hřídele pomocí multimetru Odstraňte problémy s indukčním snímačem polohy klikového hřídele nebo snímačem polohy klikového hřídele typu Hallova efektu (CKP) pomocí digitálního multimetru. Test snímače polohy vačkového hřídele Test snímače polohy vačkového hřídele můžete provést doma pomocí digitálního multimetru a v případě potřeby pomocí několika běžných nástrojů. Můj motor nemá na cívce jiskru Pokud zapalovací systém vašeho auta nemá jiskru, několik jednoduchých testů vám pomůže najít závadu. Resources for Dealing With Battery Faults How to Test a Car Battery With a Multimeter or Hydrometer This guide will show you how to use a digital multimeter, hydrometer, and other simple tools to troubleshoot, inspect, and clean your battery if necessary. How to Do a Parasitic Battery Drain Test Find that parasitic battery drain that's causing your car battery problems whether you have a newer or older vehicle model. Tento obsah je přesný a pravdivý podle nejlepšího vědomí autora a nemá nahrazovat formální a individualizované rady od kvalifikovaného profesionála.
Major vacuum leaks are not common, but they definitely happen. A vacuum leak can make the air-fuel mixture too lean, preventing the engine from starting.
A leak may come from a vacuum line, intake manifold gasket, throttle body gasket, leaking EGR valve gasket, power brake booster or positive crankcase ventilation (PCV) valve.
Vacuum leaks can be tricky to find. You can visually inspect every vacuum hose and trace it with your hand, feeling for tears or damaged spots. Also, pay attention to hissing sounds that may indicate a leak.
A leaking gasket is harder to detect, though, unless you have a smoke machine designed for this purpose.
V případě potřeby nahlédněte do návodu k opravě vozidla.
10. Failed Timing Belt You won't see this type of failure often. Timing belts can last between 50,000 and 100,000 miles or more, depending on your particular model. And if you have a timing chain rather than a belt, you may never have to worry about replacing it. Still, if you've checked the usual suspect without success, check for a failed timing belt or chain. The engine's crankshaft and camshaft are joined by a timing belt or chain through a series of sprockets. When this belt or chain brakes or wears out, or the tensioner fails, the crankshaft won't be able to rotate the camshaft anymore, making it impossible to start the engine. Checking for a failed timing belt or chain: On a vehicle fitted with a distributor, you can remove the distributor cap and try to fire up the engine. If the distributor rotor doesn't move, most likely your timing belt or chain, or one of the system components, has failed. On models with multiport fuel injection systems, sometimes it's possible to remove the timing belt or chain cover to check for camshaft movement while trying to start the engine. Or you may be able to remove the oil cap from the valve cover, or the cover itself if necessary, to check for valve movement while trying to start the engine. If there's no movement, it's time to check the belt, chain, or system components. If the camshaft rotates, you may still want to verify ignition timing. If the belt or chain has skipped some sprocket teeth, it may be difficult or impossible to start your engine. Consult your vehicle repair manual to check crankshaft and camshaft synchronization. A Few Unusual Additional Possibilities Of course, there are other model-specific components or systems that can prevent your vehicle from starting. Například: A faulty key fob or with a drained battery. Inertia fuel shut-off switch triggered during an accident or a jolt on the road. Faulty anti-theft system. Consult the repair manual for your specific make and model for help on these and other systems or components. Dealing With a Car That Won't Start To sum up, when your car won't start, begin your diagnostic with the most simple components or obvious potential problems, as in Diagnostics 1 and 2 at the beginning of the article: Make sure there's gas in the fuel tank. Verify your battery's state of charge. Make sure battery terminals are clean and tight. Check the battery and engine ground connections. Verify the fuel pump is energizing when turning the ignition key to On. Check for blown fuses. Then you can start checking the alternator, starter motor, ignition, fuel system pressure, and their circuits. Most of the time you'll be able to fix the problem yourself. Sometimes, you will need to replace a fuel pressure regulator, ignition coil, module, or fuel pump, or fix a vacuum leak. See the Resources below for diagnostic ideas if you have narrowed your problem down to a particular system. Resources on Starting System Faults Car Starter Problems? Five Starting-System Inspection Tips Car starter problems? Don't blame the starter motor yet. These 5 troubleshooting tips will help you find the culprit. Jak používat pokles napětí k odstraňování problémů se systémem startéru Testování poklesu napětí vám může pomoci najít problémová místa v obvodu startéru, než budete zbytečně vyměňovat součástky. Resources on Charging Circuit Faults Troubleshooting Alternator and Charging System Problems Diagnose alternator and charging system problems with this practical guide to get your car back on the road faster. How to Do a Voltage Drop Test on Your Charging System Voltage-drop test your charging system circuit before condemning your alternator. Resources on the Fuel System Jak testovat regulátor tlaku paliva Naučte se testovat regulátor tlaku paliva, abyste ušetřili peníze a čas při opravách automobilů. Resources for Dealing with the Crankshaft and Camshaft Sensors Jak otestovat snímač polohy klikového hřídele pomocí multimetru Odstraňte problémy s indukčním snímačem polohy klikového hřídele nebo snímačem polohy klikového hřídele typu Hallova efektu (CKP) pomocí digitálního multimetru. Test snímače polohy vačkového hřídele Test snímače polohy vačkového hřídele můžete provést doma pomocí digitálního multimetru a v případě potřeby pomocí několika běžných nástrojů. Můj motor nemá na cívce jiskru Pokud zapalovací systém vašeho auta nemá jiskru, několik jednoduchých testů vám pomůže najít závadu. Resources for Dealing With Battery Faults How to Test a Car Battery With a Multimeter or Hydrometer This guide will show you how to use a digital multimeter, hydrometer, and other simple tools to troubleshoot, inspect, and clean your battery if necessary. How to Do a Parasitic Battery Drain Test Find that parasitic battery drain that's causing your car battery problems whether you have a newer or older vehicle model. Tento obsah je přesný a pravdivý podle nejlepšího vědomí autora a nemá nahrazovat formální a individualizované rady od kvalifikovaného profesionála.
You won't see this type of failure often. Timing belts can last between 50,000 and 100,000 miles or more, depending on your particular model. And if you have a timing chain rather than a belt, you may never have to worry about replacing it.
Still, if you've checked the usual suspect without success, check for a failed timing belt or chain.
The engine's crankshaft and camshaft are joined by a timing belt or chain through a series of sprockets. When this belt or chain brakes or wears out, or the tensioner fails, the crankshaft won't be able to rotate the camshaft anymore, making it impossible to start the engine.
Checking for a failed timing belt or chain:
On a vehicle fitted with a distributor, you can remove the distributor cap and try to fire up the engine. If the distributor rotor doesn't move, most likely your timing belt or chain, or one of the system components, has failed.
On models with multiport fuel injection systems, sometimes it's possible to remove the timing belt or chain cover to check for camshaft movement while trying to start the engine. Or you may be able to remove the oil cap from the valve cover, or the cover itself if necessary, to check for valve movement while trying to start the engine. If there's no movement, it's time to check the belt, chain, or system components.
If the camshaft rotates, you may still want to verify ignition timing. If the belt or chain has skipped some sprocket teeth, it may be difficult or impossible to start your engine.
Consult your vehicle repair manual to check crankshaft and camshaft synchronization.
A Few Unusual Additional Possibilities Of course, there are other model-specific components or systems that can prevent your vehicle from starting. Například: A faulty key fob or with a drained battery. Inertia fuel shut-off switch triggered during an accident or a jolt on the road. Faulty anti-theft system. Consult the repair manual for your specific make and model for help on these and other systems or components. Dealing With a Car That Won't Start To sum up, when your car won't start, begin your diagnostic with the most simple components or obvious potential problems, as in Diagnostics 1 and 2 at the beginning of the article: Make sure there's gas in the fuel tank. Verify your battery's state of charge. Make sure battery terminals are clean and tight. Check the battery and engine ground connections. Verify the fuel pump is energizing when turning the ignition key to On. Check for blown fuses. Then you can start checking the alternator, starter motor, ignition, fuel system pressure, and their circuits. Most of the time you'll be able to fix the problem yourself. Sometimes, you will need to replace a fuel pressure regulator, ignition coil, module, or fuel pump, or fix a vacuum leak. See the Resources below for diagnostic ideas if you have narrowed your problem down to a particular system. Resources on Starting System Faults Car Starter Problems? Five Starting-System Inspection Tips Car starter problems? Don't blame the starter motor yet. These 5 troubleshooting tips will help you find the culprit. Jak používat pokles napětí k odstraňování problémů se systémem startéru Testování poklesu napětí vám může pomoci najít problémová místa v obvodu startéru, než budete zbytečně vyměňovat součástky. Resources on Charging Circuit Faults Troubleshooting Alternator and Charging System Problems Diagnose alternator and charging system problems with this practical guide to get your car back on the road faster. How to Do a Voltage Drop Test on Your Charging System Voltage-drop test your charging system circuit before condemning your alternator. Resources on the Fuel System Jak testovat regulátor tlaku paliva Naučte se testovat regulátor tlaku paliva, abyste ušetřili peníze a čas při opravách automobilů. Resources for Dealing with the Crankshaft and Camshaft Sensors Jak otestovat snímač polohy klikového hřídele pomocí multimetru Odstraňte problémy s indukčním snímačem polohy klikového hřídele nebo snímačem polohy klikového hřídele typu Hallova efektu (CKP) pomocí digitálního multimetru. Test snímače polohy vačkového hřídele Test snímače polohy vačkového hřídele můžete provést doma pomocí digitálního multimetru a v případě potřeby pomocí několika běžných nástrojů. Můj motor nemá na cívce jiskru Pokud zapalovací systém vašeho auta nemá jiskru, několik jednoduchých testů vám pomůže najít závadu. Resources for Dealing With Battery Faults How to Test a Car Battery With a Multimeter or Hydrometer This guide will show you how to use a digital multimeter, hydrometer, and other simple tools to troubleshoot, inspect, and clean your battery if necessary. How to Do a Parasitic Battery Drain Test Find that parasitic battery drain that's causing your car battery problems whether you have a newer or older vehicle model. Tento obsah je přesný a pravdivý podle nejlepšího vědomí autora a nemá nahrazovat formální a individualizované rady od kvalifikovaného profesionála.
Of course, there are other model-specific components or systems that can prevent your vehicle from starting. Například:
Consult the repair manual for your specific make and model for help on these and other systems or components.
To sum up, when your car won't start, begin your diagnostic with the most simple components or obvious potential problems, as in Diagnostics 1 and 2 at the beginning of the article:
Then you can start checking the alternator, starter motor, ignition, fuel system pressure, and their circuits.
Most of the time you'll be able to fix the problem yourself. Sometimes, you will need to replace a fuel pressure regulator, ignition coil, module, or fuel pump, or fix a vacuum leak.
See the Resources below for diagnostic ideas if you have narrowed your problem down to a particular system.
Tento obsah je přesný a pravdivý podle nejlepšího vědomí autora a nemá nahrazovat formální a individualizované rady od kvalifikovaného profesionála.