1992 Pontiac Bonneville Runs great cold, but terrible hot

1992 PONTIAC BONNEVILLE
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MIKE T
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Engine Performance problem
1992 Pontiac Bonneville 6 cyl Front Wheel Drive Automatic 210K miles
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While running cold everything is fine, but after the vehicle warms up it starts to run rough at idle and sometimes stall.
Apr 11, 2008 at 5:50 AM
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MERLIN2021
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Service engine soon light on?


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Apr 11, 2008 at 6:06 AM
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MERLIN2021
  • ✓Experienced Mechanic
  • 17,250 POSTS
Start with the Idle air control, it's bolted to the throttlebody, then check for stuck egr, maybe even unplug an 02 sensor, it is affected only when warm, so since 02 and egr are out of the loop at cold start pay attention there...
Apr 12, 2008 at 3:29 AM
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