1987 Chevy Suburban gas millage issues

1987 CHEVROLET SUBURBAN
100,000 MILES • V8 • 2WD • AUTOMATIC
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CHICKEN NOODLE
  • MEMBER
  • 1 POST
I am recieving terrible gas millage and have changed the plugs wires and cap rotor i know these things dont get good mileage but about 9 per at best
Feb 27, 2008 at 10:46 AM
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BLACKOP555
  • ✓Experienced Mechanic
  • 10,386 POSTS
run a few tanks of fuel system cleaner through it add a little more then suggested.

also check your tire pressure and ignition timing.

if that is all good you may have a bad air filter.

and if all those are good you probably have a bad o2 sensor.
Mar 21, 2008 at 2:04 AM
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