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Check engine

Tiny
RICHARD GOODWIN
  • MEMBER
  • 1999 GMC SUBURBAN
  • V8
  • 2WD
  • AUTOMATIC
  • 136,000 MILES
What would make bank 1& bank 2
run lean
Monday, January 24th, 2011 AT 2:27 AM

2 Replies

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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Monday, January 24th, 2011 AT 2:38 AM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Intake manifold leak, plugged fuel filter, oxygen sensor aged, MAP sensor out of range, fuel pressure too low(bad regulator)
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Monday, January 24th, 2011 AT 2:39 AM

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