What Causes Idle Vibration in Passat?
1 Answers
Passat idle vibration is mainly caused by the following reasons: 1. Unstable oil pressure: If the fuel pump supply pressure is abnormal, or the intake pressure sensor value is incorrect and malfunctioning, it can cause idle vibration of the vehicle body. It is best to check the oil pressure and replace components if necessary. 2. Aging engine components: Aging engine components, such as worn engine mounts, can cause idle vibration of the vehicle body. Engine mounts are actually 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 vehicle. 3. Excessive carbon buildup and dirt: A dirty engine throttle or excessive carbon deposits on the fuel injectors can also cause idle vibration. When there is excessive carbon buildup, 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 and difficulty in starting. After the engine starts, the gasoline adsorbed on the carbon deposits will be sucked into the cylinder by the engine's vacuum and burned, making the mixture too rich. This causes the engine's combustible mixture to alternate between being too lean and too rich, leading to idle shaking.
