What causes slight shaking when the car is idling?

[SanArthur]

The reasons for car body shaking during idling: 1. Severe engine carbon deposits: The most common cause of car shaking is a dirty throttle valve or excessive carbon buildup in the fuel injectors. When the engine's combustible mixture becomes alternately lean and rich, it causes idle shaking after a cold start. 2. Ignition system issues: Check the working condition of the spark plugs, high-voltage wires, and ignition coils. Problems in the ignition system or poor performance of the spark plugs can also lead to such symptoms. 3. Unstable fuel pressure: If you have already cleaned the engine carbon deposits, cleaned the throttle valve, and replaced the spark plugs but still notice body shaking during idling, it is recommended 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 cause body shaking. 4. Aging engine components: Car shaking can also be related to worn engine mounts. Engine mounts are responsible for absorbing minor vibrations during engine operation. If the engine mounts are faulty, these vibrations can be transmitted to the steering wheel and the cabin, causing shaking during idling.