1995 Pontiac Firebird missfire and rich fuel mixture

Tiny
LIMO1644
  • MEMBER
  • 1995 PONTIAC FIREBIRD
  • V8
  • 2WD
  • MANUAL
  • 102,000 MILES
My transam is running rich and feels like it's not running on all 8 cylinders.
Saturday, May 22nd, 2010 AT 11:08 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi limo1644, Welcome to 2carpros and TY for the donation

Probable causes of an engine running rich are as follows:

1. Fuel pressure not within specs. Can be cause by restricted fuel return line or defective fuel pressure regulator.
2. Defective Oxygen Sensors.
3. Leaking injectors.
4. Coolant temperature sensor out of calibration.
5. Restricted air intake system.
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Saturday, May 22nd, 2010 AT 11:42 AM

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