What causes the idle vibration in Buick Excelle?

[LaLeilani]

Buick Excelle idle vibration reasons are as follows: Throttle body carbon buildup: Carbon buildup can cause idle vibration, so you can start by cleaning the throttle body. If the vibration stops after cleaning, it indicates the throttle was dirty. If the vibration persists after cleaning, the throttle body assembly might be damaged and need replacement. Note that since modern vehicles use electronic throttle bodies, idle speed relearning is required after cleaning. Poor fuel quality: Low-quality gasoline leads to poor fuel injector atomization, resulting in incomplete combustion of the air-fuel mixture in the cylinders, which can also cause idle vibration. It's recommended to use higher-grade gasoline after finishing the current tank and perform a fuel system cleaning. Spark plug misfire: Spark plug misfire causing one or multiple cylinders to stop working can also lead to idle vibration. Check the spark plugs - if cracks appear on the ceramic parts, also inspect whether the ignition module is functioning properly.