What are the causes of idle vibration in an Audi A5?

[AlanaDella]

Audi A5 idle vibration causes and solutions: Ignition system issues: If there is a malfunction in the car's ignition system, it can lead to poor ignition system performance, improper spark plug firing, and other problems, resulting in unstable idle vibration. Solution: Check the condition of the spark plugs, high-voltage wires, and ignition coils to see if there is excessive carbon buildup on the spark plugs. If found, clean or replace the spark plugs immediately. Poor fuel quality: Poor fuel quality can damage engine performance, leading to idle vibration issues. Solution: Clean the car's throttle body promptly, which can generally resolve common faults. Excessive carbon buildup or aging in the engine: Excessive carbon buildup inside the engine can cause the gasoline sprayed by the cold start injector to be largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts, making it difficult to start and causing unstable oil pressure. Solution: Check the oil pressure and replace components if necessary.