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?
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.