What are the reasons for the Passat B5 shaking during startup?

[SanJeremiah]

Passat B5 shaking during startup is mainly caused by the ignition system, unstable oil pressure, and engine aging. Solutions for the ignition system: Check the working condition of the spark plugs, high-voltage wires, and ignition coils. Poor performance of the ignition system or improper spark plug firing can also lead to such faults. Solutions for oil pressure: If you have already cleaned the engine carbon deposits, washed the throttle body, replaced the oil pads 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 supply pressure or incorrect values and poor performance of the intake pressure sensor can cause body shaking. Solutions for aging engine components: Car shaking is also related to aging engine mounts. Engine mounts are actually 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 interior, causing shaking at idle.