What is the problem with high shaking and vibration during cold idle?

[JamesonFitz]

Reasons for car body shaking during idle: 1. Severe engine carbon deposits: The most common cause of car shaking is dirty throttle or excessive carbon deposits in the fuel injectors. When the combustible mixture in the engine is sometimes lean and sometimes rich, it causes idle shaking after a cold start. 2. Ignition system problems: Check the working condition of the spark plugs, high-voltage wires, and ignition coils. Poor performance of the ignition system or spark plugs can also lead to such faults. 3. Unstable oil pressure: If you have already cleaned the engine carbon deposits, washed the throttle, and replaced the spark plugs but still notice body shaking during idle, it is recommended to check the fuel supply pressure and the intake pressure sensor. Abnormal fuel pump pressure or incorrect values and poor performance of the intake pressure sensor can cause body shaking. 4. Aging engine components: Car shaking is also related to the aging of engine mounts. Engine mounts are responsible for absorbing minor vibrations during engine operation. If there is a problem with the engine mounts, these vibrations will be transmitted to the steering wheel and the cabin, causing shaking during idle.