1997 Other Chevrolet Models POOR MILAGE

Tiny
JESUSFERNANDEZ
  • MEMBER
  • 1997 CHEVROLET
  • V8
  • 4WD
  • AUTOMATIC
  • 10,956 MILES
5.7L 4x4 changed plugs, wires, dist cap, rotor, replaced fuel injectors. Use to get 16 to 17 Hiway MPG. This started at ~ 90K miles. Seems to idle ok. Now milage is ~12.3 to 12.8, I drive like an old man, easy excelleration and speeds at 55. Using Regular or medium grade, makes very little difference.
Wednesday, September 15th, 2010 AT 10:27 PM

1 Reply

Tiny
KEVIN12881
  • MEMBER
  • 336 POSTS
It could be your o2 sensors. May have two, one on each manifold, three the prvious two and one befor cat converter or maybe even four with one after the cat, but I bet just the two. Strong Emphasis on the word could, but I have a feeling it just may be your cause
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Wednesday, September 15th, 2010 AT 10:55 PM

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