2002, 3.1, Grand Prix, ROUGH/SURGING idle at a stop

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goodwinbj
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Joined: Thu May 25, 2017 9:34 am

2002, 3.1, Grand Prix, ROUGH/SURGING idle at a stop

Unread post by goodwinbj » Mon Jul 31, 2017 5:23 pm

Subject says it all!

 

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

Re: 2002, 3.1, Grand Prix, ROUGH/SURGING idle at a stop

Unread post by carriedi » Mon Jul 31, 2017 10:02 pm

you should have it scanned. see if it is misfiring, vacuum leak, leaky injector, dirty injector, leaking fuel pressure regulator, O2 sensor stuck, exhaust getting plugged up. Low compression, jumped timing, TPS, CMP sensors...

Because almost everything is computer controlled, you need to see what the computer is reacting to.
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