What are the causes of engine misfire?
2 Answers
The following are the causes of engine misfire: 1. Spark plug issues: clogged or damaged; 2. Cylinder wire issues; 3. Ignition coil issues; 4. Fuel injector issues: clogged or low voltage causing DME internal injector data loss; 5. Air-fuel mixture issues; 6. Cylinder pressure issues. The following is an analysis of engine misfire faults: 1. Engine misfire monitoring: To prevent excessive exhaust emissions and thermal damage to the catalytic converter, the engine control unit uses the crankshaft position sensor to monitor deviations in engine rotation speed to determine misfire, and the camshaft position sensor to identify the misfiring cylinder. 2. Classification of engine misfire: Engine misfire can be simply divided into two situations, one is complete misfire, meaning no combustion, and the other is partial misfire, meaning unstable combustion.
I've been driving for half my life and have encountered engine misfires many times. Essentially, it's when a cylinder fails to ignite, causing the car to shake like a sieve. The most common causes are spark plugs being burnt out or carbon-fouled, failing to spark; ignition coils aging or getting short-circuited by water, preventing voltage from reaching; or fuel injectors getting stuck or clogged, blocking fuel flow. Insufficient compression can also be a culprit, like piston ring leaks or a blown head gasket. These issues make the car run weak, emit black smoke, waste fuel, and are unsafe. Using low-quality gasoline in daily driving can accelerate fuel injector problems. I remember once on a long trip, the misfire shook the steering wheel violently—a quick check at a roadside shop revealed a spark plug issue, and replacing it fixed the problem immediately. The best prevention is regular maintenance: inspect spark plugs and fuel injectors every 5,000 km—don’t skimp and risk bigger trouble.
