Lesbaru Posted October 21, 2004 Share Posted October 21, 2004 Well, bummer. Car runs better with new cats, but my mileage actually went DOWN to 17 mpg. What gives? Anybody got an idea what might be causing this? (it was 24 mpg, then after CEL for cats it went down to 18 mpg) Do I need a tune up after installing new cats? The car runs great. Quote Link to comment Share on other sites More sharing options...
cookie Posted October 21, 2004 Share Posted October 21, 2004 after that I would suspect oxy sensors. Quote Link to comment Share on other sites More sharing options...
oddcomp Posted October 21, 2004 Share Posted October 21, 2004 did you happen to reset the ecu? it prolly adjusted itself to work with the old plugged cats also do you know if any of the cat guts broke off? there maybe some stuck in the muffler mmm roasted cat guts.. lol Quote Link to comment Share on other sites More sharing options...
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