What are the causes of engine misfire in cars?
4 Answers
Car engine misfire can be caused by: 1. Excessive wear gap in engine cylinder liner piston rings; 2. Fuel injector wear; 3. Spark plug carbon buildup. Engine misfire refers to insufficient power caused by engine failure, resulting in lack of power, with situations where a minority of cylinders are not working. Engine misfire can shorten the service life of lubricating oil and may lead to sudden engine stall, increased fuel consumption, and black smoke emissions. An engine is a machine capable of converting other forms of energy into mechanical energy, originating in the UK. It can refer to either power generation devices or the entire machine including power units, with types including internal combustion engines, external combustion engines, electric motors, etc.
A few days ago, my car was shaking badly, and the engine sounded like a tractor. The mechanic later told me it was misfiring. There are many possible causes: old spark plugs or severe carbon buildup can directly affect a cylinder's ignition efficiency; aging or cracked ignition coils can also prevent proper firing; clogged fuel injectors or a short circuit in the fuel line can stop fuel from entering the cylinder, causing issues; a faulty compression system, such as poorly sealing valves or worn piston rings, can lead to insufficient compression pressure, extinguishing the flame; and a faulty crankshaft position sensor or oxygen sensor can send incorrect signals to the computer, causing misdirection. If these problems aren't fixed early, the car will jerk while driving, fuel consumption will skyrocket, and the engine core may be damaged. I've since developed a habit of regularly checking these components, which has saved me a lot of hassle.
When I first got my driver's license, I experienced a misfire issue while driving, which left me quite flustered. Later, I learned that it's mainly caused by ignition problems: spark plugs getting dirty or burnt out over time, failing to produce sparks; faulty ignition coils causing unstable current and preventing a cylinder from firing. The fuel system can also be the culprit: clogged fuel injectors preventing proper fuel spray, or wiring short circuits leading to abnormal fuel supply. Compression issues, like poor valve sealing or failed piston rings, can prevent proper ignition; faulty sensors like oxygen sensors can mislead the ECU into making wrong adjustments. As a beginner, I've learned to watch for symptoms—such as sluggish acceleration or popping sounds from the exhaust—so I can visit a repair shop promptly and prevent minor issues from becoming major troubles.
Often helping friends with car repairs, I've found there are quite a few common causes for engine misfires. Excessive carbon buildup or improper gap on spark plugs directly affects ignition performance; aging or cracked ignition coils result in weak current output causing cylinder misfires; clogged fuel injectors or fuel pump issues lead to insufficient fuel supply and failure to ignite; poor compression due to valve erosion or piston ring damage results in inadequate pressure; sensor failures like a faulty crankshaft position sensor send wrong signals disrupting the system. Using an OBD scanner to read trouble codes can quickly pinpoint the issue, allowing timely part replacement to prevent more severe damage. Simple DIY checks like replacing spark plugs are manageable, but for complex issues, it's advisable to take the car to a professional shop.
