3500 rpm Idle

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Coldbeerkid
Posts: 2
Joined: Fri Mar 02, 2018 3:00 pm

3500 rpm Idle

Unread post by Coldbeerkid » Fri Mar 02, 2018 3:08 pm

I have a 2002 Grand Prix with 60,000 miles on it. All of a sudden when starting idle races to 3500 rpm. Some wires got chewed up by mice for the coolant sensor. I replaced wires so far, and still running the same. Any suggestions?

 

Coldbeerkid
Posts: 2
Joined: Fri Mar 02, 2018 3:00 pm

Re: 3500 rpm Idle

Unread post by Coldbeerkid » Fri Mar 02, 2018 3:09 pm

It has the 3800 Series II motor

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carriedi
Posts: 2266
Joined: Wed Apr 10, 2013 12:42 pm
Location: Oregon

Re: 3500 rpm Idle

Unread post by carriedi » Fri Mar 02, 2018 9:23 pm

a high idle can be caused by a vacuum leak. unmetered air entering the intake system run lean and the O2 sensor says richen up the to get the exhaust to 14.7 to 1. More air plus more fuel means more rpms.

If you can get your hands on a scanner, check your fuel trims. Is your check engine light coming on? Do you have codes that you can tell me the numbers?
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