What Causes Cylinder Misfire?
2 Answers
Causes of cylinder misfire: 1. Spark plug issues, such as clogging or damage; 2. Problems with cylinder wires; 3. Faulty ignition coils; 4. Fuel injector issues, including clogging or low voltage causing DME internal injector data loss; 5. Improper air-fuel mixture; 6. Cylinder pressure problems. Engine cylinder misfire can lead to severe consequences. After misfire occurs, high concentrations of hydrocarbons enter the exhaust system, resulting in excessive exhaust emissions. High hydrocarbon levels also increase the temperature of the catalytic converter, potentially causing damage in severe cases.
I've dealt with cylinder misfires quite a few times, mainly due to issues in the ignition system and fuel supply. The most common problems are worn-out or carbon-fouled spark plugs that can't ignite the gasoline, or faulty ignition coils failing to deliver high voltage. On the fuel system side, clogged or dirty fuel injectors result in insufficient fuel spray, while low fuel pressure messes up the air-fuel mixture ratio. Poor compression can also be a culprit—think blown head gaskets, faulty valve seals, or worn piston rings lowering compression ratio too much to ignite. If sensors like the crankshaft position sensor malfunction, the ECU miscalculates ignition timing, causing big trouble. Regular inspection and replacement of these components prevents headaches. When the engine starts shaking, pull over immediately to avoid costly catalytic converter damage. Simple DIY tasks like changing spark plugs are doable, but electrical issues are best left to professionals.
