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What are the reasons for body shaking when an automatic transmission is in D gear?

2 Answers

Minnie

07/25/25 3:22pm

The reasons and solutions for body shaking when an automatic transmission is in D gear are as follows: 1. Excessive engine carbon deposits, causing incomplete combustion of gasoline, leading to engine shaking and abnormal noises. Clean the carbon deposits on the engine promptly. 2. Excessive carbon deposits on the throttle valve. Users can clean the throttle valve. Carbon deposits on the throttle valve affect its opening degree and air intake, causing the engine speed to fluctuate erratically after a cold start, making it very unstable. 3. Excessive carbon deposits on the spark plugs. Carbon deposits can be cleaned to restore the activity of the spark plugs; however, some spark plugs may have expired, leading to reduced performance. Weak sparks from individual spark plugs on certain cylinders can affect the car's performance, causing minor faults such as unstable idling. Replace the spark plugs with new ones promptly.

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Gama

08/11/25 9:26pm

When my automatic transmission car is shifted into D gear, the body suddenly shakes, feeling like the car is throwing a tantrum. I've looked it up, and this usually happens for several reasons: there might be an issue with the engine's ignition system, such as worn-out spark plugs or aging ignition coils, causing some cylinders to misfire; the transmission fluid might be too dirty or insufficient, leading to rough shifting; if the engine mounts are broken, the entire engine can shake violently; a clogged air filter or carbon buildup in the fuel system can also cause unstable fuel supply and shaking. When the car shakes while driving, I have to slow down and stop to check, otherwise it could easily lead to an accident. It's recommended to regularly replace spark plugs and engine oil, check mount bolts, and keep the transmission fluid clean to significantly reduce the frequency of shaking. With these small maintenance tasks done well, the car will run much smoother, saving both money and hassle compared to major repairs.

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