What Causes Body Shaking During Acceleration?

[OAlan]

Body shaking during acceleration can be caused by the following reasons: 1. Severe engine carbon deposits: The most common cause of car shaking is a dirty throttle or excessive carbon buildup in the fuel injectors. When there is too much carbon inside the engine, the gasoline sprayed by the cold-start injector will be largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts and making it difficult to start. In this situation, the car will only start easily once the carbon deposits have absorbed enough gasoline to become saturated. After starting, the gasoline adsorbed on the carbon deposits will be sucked into the cylinders by the engine's vacuum and burned, making the air-fuel mixture too rich. The engine's combustible mixture will fluctuate between too lean and too rich, causing idle shaking after a cold start. The lower the temperature, the more fuel is required for a cold start, and the presence of carbon deposits will significantly affect whether the cold start proceeds smoothly. 2. Issues with the ignition system: Check the condition of the spark plugs, high-voltage wires, and ignition coils. Poor performance of the ignition system or weak sparking from the spark plugs can also lead to such problems. 3. Unstable fuel pressure: If you have already cleaned the engine carbon deposits, throttle, replaced the gaskets and spark plugs, but still notice body shaking 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 and poor performance of the intake pressure sensor can both cause body shaking. 4. Aging engine components: Car shaking can also be related to the aging of engine mounts (also known as engine cushions). Engine mounts are essentially the shock absorption system of the engine, responsible for absorbing minor vibrations during engine operation. If the engine mounts are faulty, these vibrations will be transmitted to the steering wheel and the cabin, causing shaking at idle.