Will not pass smog because of lean mixsture fault code

Tiny
STEVEK
  • MEMBER
  • 1999 CHEVROLET EXPRESS
  • V8
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
Hi, I have a 1999 express van that has a lean mixture fault code and will not pass smog because of it, it is a 350 motor
Sunday, January 16th, 2011 AT 7:51 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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.
6. Oxygen Sensor.
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Sunday, January 16th, 2011 AT 11:19 PM

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