What Are the Causes of Car Engine Misfire?
2 Answers
Car engine misfire is mainly manifested as single-cylinder (or multi-cylinder) non-operation or poor operation. The main causes of cylinder misfire are the following 5 points: 1. Ignition system failure: such as incorrect ignition timing, abnormal spark plug gap, carbon buildup, breakdown, high-voltage line leakage, ignition coil open circuit or short circuit, ignition module and circuit faults, etc. 2. Fuel supply system failure: such as too low or too high fuel pressure, injector coil open circuit, short circuit, mechanical jamming, etc. 3. Intake system failure: such as air filter clogging, intake system leakage, etc. 4. Insufficient cylinder pressure: such as valve train failure, poor sealing between piston, piston rings and cylinder wall, cylinder gasket damage, etc. 5. Other faults: other faults in the engine electronic control system.
I remember that time when my car's engine was shaking inexplicably, as if it was about to fall apart—it was terrifying! Later, I learned that there could be many reasons for this, such as worn-out spark plugs, which are responsible for ignition and can misfire when they burn out. The fuel pump might also be faulty, failing to supply enough fuel, causing the engine to jerk. A clogged air filter can restrict airflow, leading to incomplete fuel combustion. Sensor failures are even more troublesome; for example, if the oxygen sensor malfunctions, it can mess up the air-fuel mixture ratio, resulting in frequent misfires. These are all common issues. Ignoring them can not only cause a sharp increase in fuel consumption but also potentially damage the engine. That's why regular maintenance is crucial—don't procrastinate.
