What Causes Idle Shaking in Sedans?

[DeTessa]

Reasons for idle shaking in sedans: 1. Severe engine carbon buildup: A common cause of car shaking is excessive dirt in the throttle body or carbon buildup in the fuel injectors. 2. Ignition system issues: Check the working condition of spark plugs, high-voltage wires, and ignition coils. Poor performance in the ignition system or weak spark plug firing can also lead to such faults. 3. Unstable fuel pressure: If you have already cleaned the engine carbon buildup, throttle body, replaced 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 manifold pressure sensor. 4. Aging engine components: Car shaking can also be related to worn engine mounts. Engine mounts act as the shock absorption system for the engine, absorbing minor vibrations during operation. If the engine mounts fail, these vibrations can transfer to the steering wheel and cabin, causing shaking during idle in the morning.