Why Does a New Car Shake at Idle?

1 Answers
DeDerek
07/29/25 10:43pm
Reasons for a new car shaking at idle: 1. Severe carbon buildup; 2. Ignition system failure: If the car's ignition system malfunctions or the spark plugs are damaged, fuel cannot be effectively burned in the cylinders; 3. Fuel injector failure: Uneven fuel injection among the engine cylinders due to faulty injectors can also cause idle shaking. It is normal for a new car to shake at idle. Generally, when a car starts cold, the RPM may shake between 900 to 1,100 per minute. After warming up, the RPM will stabilize around 800 per minute, reaching normal levels. When the engine is running and the accelerator pedal is completely released, the engine is in an idle state.
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