check engine

1999 GMC SUBURBAN
136,000 MILES • V8 • 2WD • AUTOMATIC
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RICHARD GOODWIN
  • MEMBER
  • 1 POST
what would make bank 1& bank 2
run lean
Jan 24, 2011 at 2:27 AM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
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.
Jan 24, 2011 at 2:38 AM
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DOCHAGERTY
  • ✓ASE Certified Mechanic
  • 9,606 POSTS
  • ASE Certified Mechanic
Intake manifold leak, plugged fuel filter, oxygen sensor aged, MAP sensor out of range, fuel pressure too low(bad regulator)
Jan 24, 2011 at 2:39 AM
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