2007 WRX Management Light & Misfire (Help)
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This is a discussion on 2007 WRX Management Light & Misfire (Help) within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hi there, i am new to this site and im looking for some advise with my 07 WRX. The car ...

  1. #1
    Registered User
    Join Date
    Dec 2008

    2007 WRX Management Light & Misfire (Help)

    Hi there, i am new to this site and im looking for some advise with my 07 WRX.

    The car came with an aftermarket exhaust fitted ( turbo back) now its not all from the same manufacture but i know the back box is Cobra.

    Now a few months back when i first got the car i took it out for a good caining, things were going great and then the engine misfired and the engine management light came on and stayed on. I took the car to my dealer and they turned the light off and said bring it back if it happens again.

    Ok so since then i fitted a standard STI back box for a little less noise as i was doing alot of miles, in this period i drove the car hard a few times and never had any misfires or manag lights. Today i put my cobra box back on and went for a spin, it didnt take long for the wrx to misfire again and put the manag light back on.

    Has anyone heard of this problem? I can only think that this exhaust has never been set on the rolling road or maybe with the increased power the engine is boosting slightly to high and thats causing the mang light to come.

    Please help

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  3. #2
    Sammich Makin' Pwincess wrxtreme06's Avatar
    Join Date
    May 2007
    orlando flawduh
    I Support ClubWRX
    when you run a turboback exhaust you need some sort of tune or engine management, especially with 04+ wrx's.

    your CEL (check engine light) is coming on due to the 02 sensor in the downpipe (more than likely..)

    please get some sort of EM AS SOON AS POSSIBLE. this will eliminate the code and make your car run to its full potential without causing any harm.

    your friendly, neighborhood subaru girl

    abbigale : 06 impreza wrx tr: cobb stage II

  4. #3
    Registered User
    Join Date
    Dec 2008
    Hi and thanks for your reply. When you say i need some type of engine management or tune, do you mean the engine needs to be mapped correctly because of the full system.

    I race motor bikes and when we tune them and put full exhaust systems on we also run an uprated ECU or run a dyno jet system to sort the fuel/air mixture out.

    Is that the kind of thing you are talking about?

  5. #4
    Moderator Donkey's Avatar
    Join Date
    Apr 2005
    Da boonies,Va
    I Support ClubWRX
    Yes.A turbo back exhaust will require ECU tuning due to the emmisions functions of the rear 02 sensor.A catback will not.

    2002-7 WRX & STi Exhaust Systems Explained Uppipe Downpipe Header Catback Turboback JSC Speed
    Resident Adviser @ WTF Tuning, LLC
    2002 FORESTER S
    1998 FORESTER S

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