2000 GMC Envoy Ck Eng Light

2000 GMC ENVOY
139,000 MILES • 6 CYL • 4WD • AUTOMATIC
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LVCOUGAR1029
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My GMC Envoy was Running bad no check engine light. Took it to mechanic and they replaced the Mass Airflow sensor that didn't fix it. Then replaced cat Converter that fixed the no power problem. After 60 miles check engine light was on took it back, changed the fuel flow sensor and Map Sensor still came on. Changed the fuel filter and the fuel pump. Still the Ck Eng light comes on comes back with running to lean. Dealer and mechanic don't know what else to Do. Please Help!!!!
May 1, 2010 at 5:10 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Still the Ck Eng light comes on comes back with running to lean.

Lean fuel condition could be caused by one of the following below:

1.Vacuum leaks
2.EGR and PCV valve.
3.Low fuel pressure.
4.Dirty fuel injectors.
5.Mass Air Flow Sensor.
May 1, 2010 at 5:48 PM
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