microsvc Posted September 25, 2009 Report Share 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 Link to comment Share on other sites More sharing options...
RobertISaar Posted September 25, 2009 Report Share Posted September 25, 2009 1st: are thereany codes? Quote Link to comment Share on other sites More sharing options...
xtremerevolution Posted September 25, 2009 Report Share 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 Link to comment Share on other sites More sharing options...
RobertISaar Posted September 25, 2009 Report Share Posted September 25, 2009 add MAF to that list... Quote Link to comment Share on other sites More sharing options...
xtremerevolution Posted September 25, 2009 Report Share Posted September 25, 2009 ah yes, a dirty maf can really kill your economy. be very careful while cleaning it. Quote Link to comment Share on other sites More sharing options...
microsvc Posted September 26, 2009 Author Report Share 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 Link to comment Share on other sites More sharing options...
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