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What Causes High Idle Speed and Shaking in Cars?

1 Answers

Kirsten

07/30/25 3:18am

Car high idle speed and shaking can be caused by: 1. Dirty throttle body; 2. Faulty spark plugs; 3. Non-functioning engine cylinders; 4. Aging rubber components in engine and transmission mounts. The car engine is the device that provides power to the vehicle, determining its power performance, fuel economy, stability, and environmental friendliness. Idle speed refers to the engine running without load, needing to overcome internal friction resistance without outputting power externally, maintaining the minimum stable operating speed. The idle speed is adjusted by modifying the throttle opening size and idle fuel supply quantity.

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