running too lean 99 ford expedition bank 1 and bank 2

1999 FORD EXPEDITION
18,000 MILES
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HONEYBOY
  • MEMBER
  • 1 POST
feels like its not running on all cylinders
Oct 20, 2011 at 11:44 PM
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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.
Oct 26, 2011 at 12:39 PM
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