What Causes Car Shaking?
2 Answers
Common causes of car body shaking: 1. Excessive carbon buildup in fuel injectors and throttle body, or a dirty throttle body: During cold starts, carbon deposits inside the engine absorb some gasoline, resulting in an overly lean combustible mixture, making it difficult to start or causing engine shaking. It is necessary to clean the fuel injectors and throttle body. If the throttle body is too dirty, clean it and replace the air filter. 2. Car tire issues: If the car body has slight shaking while driving or at high speeds, and the steering wheel pulls to one side, this situation is usually caused by car tire problems. It is necessary to check the tire pressure, tire wear, shock absorbers, and other components. It is best to perform a four-wheel alignment and dynamic balancing. If there is no pulling, only dynamic balancing is needed. 3. Mismatch between the fuel supply system and ignition system: When the car's fuel supply system and ignition system are not functioning properly, shaking can also occur. It is necessary to check whether the intake pressure sensor, fuel supply pressure, spark plug firing, etc., are normal.
I've been driving for over a decade, and car shaking is indeed quite common. Most of the time, it's due to issues with the engine's ignition system—like worn spark plugs, faulty ignition coils, or cylinder imbalance—which can make the engine run unevenly, causing the car body to vibrate. It could also be unbalanced tires, where the wheels wobble while driving, especially noticeable at high speeds. A bent or worn driveshaft might cause similar problems. My advice is to first park the car safely and check the spark plugs and ignition coils, as well as inspect the tires for uneven wear. If left unresolved, fuel consumption will increase, and safety could be compromised. It's best to have a professional shop diagnose the issue as soon as possible.
