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2000 GMC Envoy Ck Eng Light

Tiny
LVCOUGAR1029
  • MEMBER
  • 2000 GMC ENVOY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 139,000 MILES
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!
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Saturday, May 1st, 2010 AT 5:10 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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.
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Saturday, May 1st, 2010 AT 5:48 PM

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