Why does an Audi shake when parked?

[McRemington]

Audi shaking when parked can be caused by severe engine carbon buildup, ignition system failure, or oil pressure issues. Detailed explanations of the causes: Severe engine carbon buildup: Engine carbon buildup is the main cause of car shaking. When there is excessive carbon buildup inside the engine, the gasoline sprayed by the fuel injector during a cold start is largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts and making the car prone to shaking. Ignition system failure: Excessive carbon buildup on the spark plugs or overly large ignition gaps can cause ignition failure. Oil pressure issues: Abnormal fuel pump pressure or incorrect readings from the intake pressure sensor can lead to poor fuel pump performance, causing the car body to shake.