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Guest Message by DevFuse

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New Cats, mpg still rotten

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2 replies to this topic

#1 Lesbaru


    Gir is my copilot

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  • Seattle

Posted 21 October 2004 - 02:48 PM

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.

#2 cookie


    Elite Master of the Subaru

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  • SFO

Posted 21 October 2004 - 04:56 PM

after that I would suspect oxy sensors.

#3 oddcomp


    Subaru Master

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  • longview ,wa

Posted 21 October 2004 - 05:24 PM

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

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