Vibrations in the car body and its engine when starting, especially when it is cold, is one of the things that worry many motorists, especially as it disappears and appears at specific times.
This problem usually results from damage to some parts of the car, the most important of which are the following:
1- A malfunction in one of the injectors in the car, sometimes it works normally, and at other times it causes a defect in the combustion process, which leads to a jerk or vibration in the car
2- A malfunction in the fuel mixing system and the air ratio in the combustion chamber of the engine, so the air inlet must be cleaned in addition to the IAC valve
3- When a vibration appears in the car when the engine is running, separate the plug of the sprayers each one separately and listen to the sound and vibration of the engine when removing each plug, and the damaged sprayer when removing its electrical plug will not change the engine sound will remain normal here you know the damaged sprayer.
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