1992 Pontiac Bonneville Runs great cold, but terrible hot

1992 PONTIAC BONNEVILLE
Avatar
MIKE T
  • MEMBER
  • 1 POST
Engine Performance problem
1992 Pontiac Bonneville 6 cyl Front Wheel Drive Automatic 210K miles
----------------------------------------------------------------
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 12:50 PM
Advertisement
Avatar
MERLIN2021
  • CAR REPAIR CONTRIBUTOR
  • 17,250 POSTS
Service engine soon light on?


https://images.2carpros.com/forum/automotive_pictures/62217_GM_DLC95_Older_3.jpg

Apr 11, 2008 at 1:06 PM
Avatar
MERLIN2021
  • CAR REPAIR CONTRIBUTOR
  • 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 10:29 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.