What causes the idle vibration in Audi A6L 3.0?

[MacAdeline]

Audi A6L idle vibration may be caused by the following reasons: Severe engine carbon deposits: Engine carbon deposits are the main cause of car vibration. When there is excessive carbon buildup inside the engine, the gasoline injected by the fuel injector during cold starts will be largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts, which can easily cause vibration. Ignition system failure: Excessive carbon buildup on the spark plugs or an overly large ignition gap can lead to ignition failure. Oil pressure issues: Abnormal fuel pump supply pressure or incorrect readings from the intake pressure sensor can cause poor fuel pump performance, leading to body vibration.