1998 Chevy Truck Runs too rich

1998 CHEVROLET TRUCK
Avatar
TOMBAPTIST
  • MEMBER
  • 1 POST
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.
May 17, 2010 at 6:14 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
RASMATAZ
  • CAR REPAIR CONTRIBUTOR
  • 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.
May 17, 2010 at 9:30 PM
Advertisement