What Causes Engine Vibration in Audi Q5?
1 Answers
1. Severe Engine Carbon Deposits: The most common cause of car vibration is a dirty throttle body or excessive carbon buildup in the fuel injectors. When there is too much carbon buildup inside the engine, the gasoline sprayed by the cold-start injector is largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts and making ignition difficult. In this situation, the engine will only start easily once the carbon deposits have absorbed enough gasoline to reach saturation. After ignition, the gasoline adsorbed on the carbon deposits is sucked into the combustion chamber by the engine's vacuum, making the air-fuel mixture overly rich. The constantly fluctuating air-fuel mixture causes idle vibration after a cold start. The lower the temperature, the more fuel is required for a cold start, and the presence of carbon deposits significantly affects the smoothness of the cold start. 2. Ignition System Issues: Check the condition of the spark plugs, high-voltage wires, and ignition coils. Poor performance in the ignition system or weak sparking from the spark plugs can also lead to such symptoms. 3. Unstable Fuel Pressure: If you have already cleaned the engine carbon deposits, throttle body, replaced gaskets and spark plugs, but still experience body vibration at idle, it is recommended to visit a 4S shop to check the fuel supply pressure and the intake pressure sensor. Abnormal fuel pump pressure or incorrect readings/malfunctioning of the intake pressure sensor can cause body vibration. 4. Aging Engine Components: Car vibration can also be related to aging engine mounts (also known as engine mounts). Engine mounts act as the shock absorption system for the engine, absorbing minor vibrations during operation. If the engine mounts are faulty, these vibrations will transfer to the steering wheel and the cabin, causing vibration at idle.
