What Causes Shaking During Acceleration in an Automatic Transmission Car?
3 Answers
Automatic transmission cars may shake during acceleration due to the following reasons: 1. Severe engine carbon buildup: The most common cause of car shaking is a dirty throttle body or excessive carbon deposits on the fuel injectors. When there is too much carbon buildup inside the engine, the gasoline sprayed by the cold start injector can be largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts, making it difficult to start. 2. Ignition system issues: Check the condition of the spark plugs, high-voltage wires, and ignition coils. Poor performance of the ignition system or inadequate spark plug firing can also lead to such symptoms. 3. Unstable fuel pressure: If you have already cleaned the engine carbon deposits, cleaned the throttle body, replaced the oil seals and spark plugs, but still experience body shaking, 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 and poor performance of the intake pressure sensor can both cause body shaking.
I noticed my automatic transmission car shakes during acceleration, which is quite common and mostly caused by engine system issues. If the car body shakes severely when you press the accelerator, don't panic immediately - it's usually due to worn spark plugs or faulty ignition coils causing poor ignition and unstable combustion. Another possibility is damaged rubber mounts on the engine supports losing their cushioning effect, transmitting vibrations during gear engagement. I've experienced this myself - my car would shake during acceleration on long trips, but replacing the spark plugs fixed it immediately. Remember, persistent shaking increases fuel consumption and may damage other components, so don't delay - get it diagnosed at a reliable repair shop as soon as possible.
The other day when I was driving my automatic car and stepped on the gas pedal, I suddenly felt the whole car body shaking, so annoying! I asked my friends, and they said the fuel injectors might be clogged, causing uneven fuel spray and imbalance; or the transmission fluid might be low or deteriorated, affecting lubrication and making gear shifts rough. I also checked if the tires were unbalanced, as uneven wheels can easily cause vibrations during acceleration. The repairs aren’t too expensive, but they do take time. I recommend doing regular minor maintenance, like cleaning the fuel injectors, to avoid costly major repairs later.
