1999 Chevy S-10 Poor Gas Mileage

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SHAKER1956
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  • 1 POST
Engine Performance problem
1999 Chevy S-10 6 cyl Four Wheel Drive Automatic 107 KM miles

I have even chipped my truck to try and get better gas mileage. Averaging 12 mpg's. New gas filter, air filter, plugs and wires. I got this code,(p1626), which is the Theft deterent system fuel enable circuit. Can this be my problem? It still hauls really good. My 95 S-10 used to average 20 mpg's in the city. Same motor!
Oct 15, 2009 at 11:52 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
Chances are you have a problem with an O2 sensor or a partially plugged catylatic converter. Have any other codes codes come up? Also, I believe the 4.3L V6 with 4wd averages around 14 MPG in the city.
Oct 17, 2009 at 9:30 AM
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