Meeky Moose Posted October 22, 2011 Share Posted October 22, 2011 so first tank of gas since it started to get a little colder out 60-70degrees vs 80's. car went from 26mpg to 17mpg.. i need to check the codes cause it does flip the check engine light once in awhile.. otherwise runs fine.. it has no cats and is straight pipe to the stock muffler. and it does have an 02 sensor. nothings changed but outside temps really.. 91' legacy 5-speed 101k Quote Link to comment Share on other sites More sharing options...
Kurumano Seiza Posted October 23, 2011 Share Posted October 23, 2011 I just had the same thing happen. I fixed some oil leaks by replacing the valve cover gaskets and missing spark plug access seals, new plugs and wires. Went from 23mpg to 26mpg, then the last three fills have dropped down to 19mpg. Quote Link to comment Share on other sites More sharing options...
CNY_Dave Posted October 23, 2011 Share Posted October 23, 2011 Mileage will take a hit if they upped the ethanol content, or started adding ethanol. Winter blend, eccch. Dave Quote Link to comment Share on other sites More sharing options...
Kurumano Seiza Posted October 23, 2011 Share Posted October 23, 2011 Has anyone else had this high of a loss just due to fuel problems though? I'm still buying fuel at the same place as before my mileage got so much worse. Quote Link to comment Share on other sites More sharing options...
Meeky Moose Posted October 24, 2011 Author Share Posted October 24, 2011 so i finally got around to pulling codes 22 = knock sensor 32 = oxygen sensor inop 35 = evap the o2 sensor code is prolly from when i ran without it for a week when i did my custom y-pipe. i wanna clear the codes and run it a week to make sure i am getting the right ones for my issues but i tried to clear the codes and they would not clear. didn't matter what i did.. any tips on clearing them? Quote Link to comment Share on other sites More sharing options...
johnceggleston Posted October 25, 2011 Share Posted October 25, 2011 disconnect the battery over night. Quote Link to comment Share on other sites More sharing options...
bstone Posted October 25, 2011 Share Posted October 25, 2011 Your MPG will tank way down when you have an O2 code. Fix the problems, clear the codes. Quote Link to comment Share on other sites More sharing options...
nipper Posted October 25, 2011 Share Posted October 25, 2011 Those codes are your answer. Quote Link to comment Share on other sites More sharing options...
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