1999 Buick Park Avenue Running rich

1999 BUICK PARK AVENUE
189,564 MILES • 6 CYL • FWD • AUTOMATIC
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PATRICK KIRBY
  • MEMBER
  • 1 POST
We wonder whats broken.Looking @ the engine run, it seems just fine for 10-15 minutes.THEN it begins to spit,sputter & rev up & down(when given gas) black smoke comes out if you try to keep it running by giving it gas.It dies & wont start again till cooled off.Autozones diagnostic had no code to give.It just said running rich.What could possibly be wrong?
May 13, 2010 at 10:22 PM
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MMPRINCE4000
  • ✓ASE Certified Mechanic
  • 8,548 POSTS
  • ASE Certified Mechanic
A sensor is bad, could be coolant temp, O2, TPS etc.

But all the sensors should set a code, is your check engine light on?
May 20, 2010 at 8:49 AM
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