What Causes Slight Vibration in the Car Seat at Idle?

[JayceFitz]

The reasons for slight vibration in the car seat at idle are: 1. The throttle is dirty or the fuel injector has excessive carbon deposits. When there is too much carbon buildup inside the engine, the gasoline sprayed by the cold start injector will be largely absorbed by the carbon deposits, resulting in an overly lean mixture during cold starts; 2. Poor performance of the ignition system or suboptimal spark plug firing conditions; 3. Abnormal fuel pump pressure or incorrect readings and poor performance of the intake pressure sensor; 4. Aging engine mounts. Engine mounts are essentially the shock absorption system of the engine, responsible for absorbing minor vibrations during engine operation. If the engine mounts are faulty, these vibrations will be transmitted to the steering wheel and the interior of the car, causing shaking at idle.