why does my 2003 buick century suddenly start to high idle

Asked by foxglove 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
55,910

TransAm77 answered 9 years ago

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.

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Oldwhitewoman88 answered 9 years ago

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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