Fuel mileage

2003 GMC SIERRA
1,012 MILES • V8 • 4WD • AUTOMATIC
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JKROLIKOWSKI
  • MEMBER
  • 1 POST
I recently replaced my mass air sensor in my 2003 GMC Sierra 2500 HD pickup. Garage told me my fuel pump was bad, not! Then I noticed my fuel milage went from approx 14-15 mpg to 10-12 mpg. Can that be adjusted ?
Thanks.
Apr 11, 2011 at 6:36 AM
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WRENCHTECH
  • ✓Experienced Mechanic
  • 20,760 POSTS
No, it can not. The computer maintains a constant 14.7:1 air/fuel ratio at all times. Your MAF is reading the correct amount of incoming air now so you are getting the corresponding correct amount of fuel.
Apr 11, 2011 at 8:38 AM
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