Does a normal engine vibrate?

[LeilaLee]

Normally, it does not vibrate. The reasons for engine idle vibration are as follows: 1. Spark plug issues: If there is a fault in the car's ignition system spark plugs, it can cause poor ignition system performance, weak spark plug firing, and other problems, leading to unstable operation during idle. 2. Fuel quality issues: Most "idle" vibration and instability problems are closely related to fuel quality. Poor fuel quality can damage engine performance, thus causing idle vibration. 3. Excessive engine carbon buildup or aging: Excessive carbon buildup inside the engine can absorb a large amount of gasoline sprayed by the fuel injector during cold starts, resulting in an overly lean air-fuel mixture and making it difficult to start. 4. Engine mount aging: Engine mounts are essentially the engine's shock absorption system, responsible for absorbing minor vibrations during operation. If the engine mounts are faulty, these vibrations can transmit to the steering wheel and the cabin, causing vibrations during idle. 5. Unstable oil pressure: If the fuel pump's supply pressure is abnormal or the intake pressure sensor readings are incorrect, poor performance can lead to body vibration.