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Why does the car shake at idle?

1 Answers

MollyDella

07/30/25 6:23am

The reasons for car shaking at idle are: 1. Excessive carbon deposits. Severe carbon buildup inside the engine cylinders can cause spark plug blockage and valve blockage; 2. Fuel supply system failure. Unstable oil pressure can easily lead to unstable mixture concentration; 3. Aging engine mounts; 4. Issues with the ignition coil or spark plugs failing to fire for some reason. Idle refers to the engine running without any load, only overcoming the frictional resistance of its internal components, without delivering external power. The minimum speed required to maintain stable engine operation is called idle speed, which is one of the five basic operating conditions of an engine. A well-functioning engine typically has an idle speed of 550 to 800 revolutions per minute. The idle speed can be adjusted by altering the throttle opening size, idle fuel supply, etc.

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