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1998 Chevy Truck Runs too rich

Tiny
TOMBAPTIST
  • MEMBER
  • 1998 CHEVROLET TRUCK
Engine Performance problem
1998 Chevy Truck V8 Two Wheel Drive Automatic

I replaced air filter, fuel injectors, plugs, wires, cap, rotor, and cooling temp sensor. And it still dumps too much fuel.
Monday, May 17th, 2010 AT 6:14 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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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Monday, May 17th, 2010 AT 9:30 PM

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