microsvc Posted September 25, 2009 Report Posted September 25, 2009 '99 Lumina 3.1L. Recently the gas mileage has gone down severely. Whats some of the most common things with this engine that can cause a drop in gas mileage? Thanks! Quote
RobertISaar Posted September 25, 2009 Report Posted September 25, 2009 1st: are thereany codes? Quote
xtremerevolution Posted September 25, 2009 Report Posted September 25, 2009 could be a lot of things... bad spark plugs, o2 sensor, dragging rear brakes (siezed calipers or hand brake cable), low tire pressure, excessive carbon buildup (seafoam the car), clogged air filter, clogged catalytic converter The last guy who came on here with a fuel economy issue gained 4mpg from seafoaming his car. Quote
xtremerevolution Posted September 25, 2009 Report Posted September 25, 2009 ah yes, a dirty maf can really kill your economy. be very careful while cleaning it. Quote
microsvc Posted September 26, 2009 Author Report Posted September 26, 2009 1st: are thereany codes? No Check Engine Light, but havent checked for codes. Autozone only checks for codes if the idiot light is on. I have no other way to check. Quote
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