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2003 Chevy Silverado Badddd Fuel Mileage

Tiny
BLEACH_33
  • MEMBER
  • 2003 CHEVROLET SILVERADO
Engine Mechanical problem
2003 Chevy Silverado V8 Four Wheel Drive Automatic 105K miles

I have been getting horrible gas mileage lately, and at almost $4 a gallon this is not good. I'm pretty sure it's not the filter as I relpaced this with the fuel pump less than 3K miles ago. Would it be the fuel injectors? Or the Oxygen sensor? I don't want to start ripping things out that don't need to be replaced
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Friday, March 21st, 2008 AT 2:34 PM

2 Replies

Tiny
DENNYP
  • MECHANIC
  • 1,823 POSTS
Make sure you have good tires and they are properly inflated. Make sure your spark plugs are good and your transmission is in good condition. You should also check your air filter. There are still many other things that can affect fuel mileage.
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Friday, March 21st, 2008 AT 10:39 PM
Tiny
BLEACH_33
  • MEMBER
  • 1 POST
I replaced all the spark plugs as I thought this could be it and it was due time, but no increase. I should check the air filter (K&N aftermarket), but I think it's fine. The transmission has been acting poorly I didn't know that could affect gas mileage. Also I recently moved from Arizona to Oregon would this have a negative effect?
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Saturday, March 22nd, 2008 AT 11:40 AM

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