What Causes Engine Idle Vibration in Cars?

[Gerald]

The causes of engine idle vibration in cars are: 1. Throttle blockage, carbon buildup, or abnormal opening; 2. Carbon buildup or blockage in the fuel injector; 3. Spark plug burning or damage; 4. Use of low-quality gasoline leading to fuel pump blockage; 5. Incomplete combustion of the air-fuel mixture in the cylinder. The solutions for engine idle vibration are: 1. Clean the fuel system and check if the idle control valve needs cleaning due to carbon buildup; 2. Inspect the spark plugs for excessive carbon buildup and replace them if necessary; 3. Check the fuel pressure and replace components if needed; 4. Replace engine mounts or other aging parts. Engine idle refers to the operation state of the engine without any load, where the clutch is engaged, the transmission is in neutral, and the throttle pedal is fully released.