The car idles smoothly, but what is the reason for the jitter?

The normal idle speed of the car but the slight vibration of the car is most likely caused by the aging of the engine foot.

The engine foot is actually the damping system of the engine. The engine foot is responsible for absorbing slight vibration when the engine is running. If there is something wrong with the engine foot, these vibrations will be transmitted to the steering wheel and cab, causing idling jitter.

Extended data:

Precautions:

If the car is shaking, it is usually caused by the tires of the car. Drivers should go to a professional garage as soon as possible to do four-wheel alignment and dynamic balance for the car. If the shaking feeling is particularly obvious when the car accelerates, it means that the transmission shaft has failed, and it is necessary to go to a professional auto repair shop to check whether the screw of the transmission shaft is loose, whether the transmission shaft is twisted and deformed, and so on.

If the car body is found to be slightly shaking or running off during driving, it is usually caused by tires. First of all, it may be that the wheel balance is not good. The owner needs to do a four-wheel positioning and dynamic balance as soon as possible, and a tire dynamic balance if the vehicle does not run off.