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.

[Sawyer]

I've been driving an Audi A6 for over four years and encountered parking vibrations twice. It's mainly caused by aging engine mount bushings. The engine mounts of Audi cars are particularly delicate and prone to cracking after five or six years of use. At this point, engine vibrations are directly transmitted to the steering wheel, especially noticeable when idling in D gear with the AC on. Last time, I replaced all three engine mount bushings for 1800 RMB, and the shaking stopped immediately. It could also be due to a dirty throttle body or worn-out spark plugs, especially for cars with over 80,000 kilometers. This issue shouldn't be ignored—prolonged vibrations could even damage the transmission. The safest option is to get a comprehensive check at an authorized 4S dealership. They have specialized equipment to measure engine vibration levels, which is far more reliable than roadside repair shops.

[ReeseAnn]

Parking vibration issues are quite common in German cars, especially older Audi models. After 15 years of repair experience, I've summarized several key points: First check if the engine mounts have collapsed or deformed, then verify whether the ignition system has any misfiring cylinders. Here's a simple diagnostic method: If the vibration is severe when braking in D gear but alleviates in N gear, fuel quality issues can basically be ruled out. Additionally, aftermarket parts modifications often cause vibrations - I've encountered cases where cheap engine mounts caused resonance. It's recommended to visit a reputable specialist workshop to read fault codes, with focus on engine operating data and transmission status, as problems in either can lead to vibrations. Timely repairs typically cost between 1,000 to 4,000, which is much cheaper than replacing the engine later.

[Anastasia]

To put it simply, there are a few aspects to consider: The most common issue is the aging of engine mounts, where cracked rubber components can directly transmit vibrations to the chassis. Secondly, excessive carbon buildup in the throttle body may cause unstable RPM due to restricted airflow. Additionally, decreased spark plug efficiency or abnormal oxygen sensor data could be factors. The solution involves replacing the engine mounts, performing a cleaning, and replacing the spark plugs. Those with strong DIY skills can attempt to clean the throttle body themselves—just purchase a can of cleaner, remove the intake pipe, and spray it down. However, replacing the engine mounts requires a lift, so it's more convenient to leave it to a professional mechanic. The cost is around the thousand-yuan range, and addressing it early brings peace of mind.