why does my 2003 buick century suddenly start to high idle

Asked by Oct 16, 2014 at 07:47 PM about the 2003 Buick Century Sedan FWD

Question type: Maintenance & Repair

My 2003 buick century started to high idle. It has been driven that way for a couple of
days, There is no check engine light on and no dtcs were present when my diagnostic
machine was put on it, please help

2 Answers


Check the throttle position sensor and the throttle plate itself. Make sure the plate is clean. Also inspect the throttle linkage make sure it's not sticking, dent or dirty.


I also have a Buick Century. I removed my idle air control and carefully cleaned the tip. I cleaned the passage with a test tube brush and throttle body cleaner, then re-installed the idle air control. While I was at it, I cleaned the throttle body butterflies and opening. It works great now!

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