What Causes Engine Shaking and Lack of Power?

[LenaMarie]

Engine shaking and lack of power can be caused by: 1. Damaged spark plugs, where the wear of the spark plug electrode gap leads to insufficient ignition, causing incomplete combustion of the air-fuel mixture and resulting in acceleration shaking; 2. Poor fuel quality, where low-quality gasoline leads to poor atomization in the fuel injectors, causing incomplete combustion of the mixture in the cylinders and resulting in engine shaking and power loss; 3. Excessive carbon buildup, where a dirty throttle body or excessive carbon deposits in the fuel injectors can cause the throttle to not close properly or the idle control motor to stick after driving a certain distance, leading to high idle speed and engine shaking; 4. Unstable fuel pressure. If you have already cleaned the engine carbon deposits, changed the oil, and replaced the spark plugs but still experience shaking at idle, it is recommended to visit a 4S shop to check the fuel supply pressure and the intake pressure sensor. If the fuel pump pressure is abnormal or the intake pressure sensor values are incorrect or malfunctioning, it can cause vehicle shaking. In this case, check the fuel pressure and replace components if necessary.