Can a Misfiring Cylinder at Idle Still Run?

[AndresLee]

If the engine shakes at idle but runs fine when driving, then it is not a misfiring cylinder. If the engine shakes at idle, it may be due to a damaged throttle body or some sensors. If the engine has a misfiring cylinder, then one cylinder is not working whether at idle or while driving. Misfiring cylinders are mostly caused by faults in the ignition system. Introduction to the automotive engine ignition system: 1. The automotive engine ignition system mainly consists of an ignition coil and spark plugs. 2. Spark plugs are wearable parts that require regular replacement. If spark plugs are used for a long time, the electrode gap will widen, which can affect the spark plug's ignition. 3. Prolonged use of spark plugs can lead to carbon buildup on the electrodes, which also affects the spark plug's ignition.

[MacKendra]

I've repaired many cars before. Idle misfire means the engine shakes severely when stationary, with some cylinders not working. In this case, the car can still move, but the power will be greatly reduced, acceleration will be as slow as a snail, and highway driving will be more difficult. Never force it to drive, otherwise it may damage the engine, burn out the catalytic converter, or even cause an accident by stalling midway. It's recommended to immediately check the spark plugs or ignition coils and spend a few hundred dollars to replace them, saving unnecessary expenses later. Always pay attention to abnormal idle conditions when driving, and timely maintenance is the best strategy.

[SanDelilah]

When I drove a used car, I experienced misfiring at idle speed, and the car shook like an earthquake. It could still move when forced to drive, but the power felt weak, making overtaking difficult, and fuel consumption soared. If left unrepaired, the problem could worsen to the point of engine stalling, especially in rainy weather, which is more dangerous. I quickly went to the repair shop, and the mechanic said it was an ignition system failure, which was fixed quickly. Now I've learned my lesson—never delay when there's an issue with idle speed.

[McLaila]

Idle misfire means some cylinders are not firing. The car can still run, but with weaker power, more vibration, and poorer acceleration than normal. Possible causes include worn spark plugs or damaged coils. Continuing to drive in this condition will increase engine wear and cause excessive exhaust emissions. It's okay for short distances, but long-term driving requires immediate repair. I once fixed it by replacing a small part—don't let a minor issue lead to major damage.