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1988 Pontiac Trans Am this car runs real rich

Tiny
88BLUNDER
  • MEMBER
  • 1988 PONTIAC TRANS AM
  • V8
  • 2WD
  • AUTOMATIC
  • 149,000 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?
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Saturday, November 21st, 2009 AT 4:52 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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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Sunday, November 22nd, 2009 AT 3:02 AM

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