2002 Buick Century high idle

2002 Buick Century Idles very high and the engine races higher the longer the car runs.

First…have your codes read. If there is no code then it’s probably a bad TPS. My aunt had this same problem on her Buick and it turned out to have a bad PCM.

Locate the Idle Air Control valve on the throttle body.


While the engine is idling fast, take the handle of a screwdriver and rap on the IAC valve. If the idle speed changes, replace the IAC valve.