THIS CAR RUNS REAL RICH

1988 Pontiac Trans Am

Tiny

88blunder

November, 21, 2009 AT 4:52 PM

Engine Performance problem
1988 Pontiac Trans Am V8 Two Wheel Drive Automatic 149000 miles

the car has the 305 tbi engine in it, it runs real rich, I have replaced the spark pluggs cap and rotor, pluggs I have gone through 2 oxugens sensors" due to the rich condition " I have checked for vaccum leaks and there are none, I just serviced the injectors, rebuilt the throttle bodie unit " new diaphragam filters and gaskets" new map sensor. It just dumps too much fuel I dont know what other sensor it could be btw I have no codes in the ecm so im stumped what could it be?

FOUND 380 RELATED QUESTIONS

Runs Rich

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720 Running Rich

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1 Answer

Tiny

rasmataz

November, 22, 2009 AT 3:02 AM

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.

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