What are the symptoms and causes of engine misfire?
2 Answers
The symptoms of engine misfire are: 1. Abnormal engine operation or insufficient power; 2. Black smoke and backfiring from the muffler; 3. Increased fuel consumption; 4. Reduced horsepower and inability to accelerate; 5. Severe shaking; 6. Increased driving noise. The causes of engine misfire are: 1. Excessive wear of engine cylinder liner and piston rings, loose sealing of intake and exhaust valves, and leakage of valve oil seals; 2. Poor fuel atomization due to injector wear, resulting in increased or decreased fuel supply. Engine misfire refers to the condition where one or more cylinders of the engine are not functioning properly. The hazards of engine misfire include: 1. Decreased engine speed or power; 2. Increased fuel consumption and emission pollution; 3. Accelerated wear of moving parts, shortening the service life of lubricating oil.
I feel that the car keeps shaking while driving, especially when idling at a stop—the whole car wobbles back and forth, as if the engine had a shiver. Acceleration feels particularly sluggish, and even when I floor the throttle, there's hardly any power. Fuel consumption keeps rising, and black smoke comes out of the exhaust with a foul smell. This is most likely a cylinder misfire issue. There are many possible causes: the most common ones are worn-out or carbon-fouled spark plugs failing to ignite, clogged fuel injectors preventing proper fuel spray, faulty ignition coils unable to generate a spark, or cylinder compression issues like leaking valves or piston wear. If these problems aren’t addressed promptly, the engine will consume more fuel or even get ruined. Last time I encountered this, I went for repairs right away—replacing a spark plug made a big difference. Never slack on routine maintenance.
