1990 Pontiac 6000 fuel problem

SHANNACHELLE

MEMBER
1990 PONTIAC 6000
6 CYL
FWD
AUTOMATIC
234,000 MILES

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.

Thursday, June 4th, 2009 AT 8:43 PM

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

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.