1990 Pontiac 6000 fuel problem

1990 PONTIAC 6000
234,000 MILES • 6 CYL • FWD • AUTOMATIC
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SHANNACHELLE
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  • 1 POST
My car at times runs with rich exhaust and also sputters and will eventually switch off. the map sensor and egr valve has been replaced along with the fuel pump as well as the catalatic convertoer. Please advise.
Jun 4, 2009 at 8:43 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Running rich:

Possible causes include a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode.
Jun 5, 2009 at 2:44 AM
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