1990 Buick Regal very rough idle

1990 BUICK REGAL
147,179 MILES • 6 CYL • FWD • AUTOMATIC
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BRADLLU
  • MEMBER
  • 1 POST
I have a 1990 Buick regal 3.1. when i put in the diagnostic tester, it teels me i have a knock sensor error. the car runs fine for about 5 minuets and then something messes up and it has a very rough idle and will then stall. i replaced the egr valve and also the idle air control valve. i dont know what to do please help. THANKS
Jan 7, 2008 at 8:53 AM
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BLACKOP555
  • ✓Experienced Mechanic
  • 10,386 POSTS
change your knock sensor, very rarely will they fail, and when they do this may be the result. also clean out the throttle body.
Jan 7, 2008 at 11:12 AM
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