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PostPosted: Thu Dec 26, 2013 10:22 pm 
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Joined: Thu Nov 18, 2010 7:57 pm
Posts: 12
Year and Trim: 1989 Pontiac Bonneville LE 3.8 V6
Hey guys...having a problem with it periodically idling rough and popping thru the exhaust during some cold mornings.. also when I turn on the defroster option.........i'm thinking its something to do with a vacuum solenoid or idle control somewhere.....it mainly does this on frosty mornings or around freezing......but runs fine after it gets heat in the motor....any ideas?..

Thanks,
Matt


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PostPosted: Wed Jan 08, 2014 3:42 pm 
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Posts like an LN3
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Joined: Mon Feb 02, 2009 10:54 am
Posts: 432
Year and Trim: 99 Bonneville
There is an idle air motor under the throttle body.\
Probably gunked up. I have one for sale if you need it.

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PostPosted: Thu Jan 09, 2014 9:11 pm 
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Joined: Tue Aug 25, 2009 8:32 pm
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Location: SE Michigan
Year and Trim: '99 Montana
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It could also be an ignition issue (plugs, wires, coils) or a bad intake temp sensor, possibly dirty mass airflow sensor. It should idle higher when it's cold, and slowly drop in speed as it warms up.

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