A long introduction/problems with misfiring at idle
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This is a discussion on A long introduction/problems with misfiring at idle within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hello everyone I am new here im coming from s2000's so its a little bit of a learning curve. Well ...

  1. #1
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    Sep 2009
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    A long introduction/problems with misfiring at idle

    Hello everyone I am new here im coming from s2000's so its a little bit of a learning curve. Well to start out I just picked up an 06 wrx with a few mods on it and it is giving me a fit. I am getting P0301-4 codes and it missfires pretty good. I already changed plugs even though they looked fine. I did a compression test and numbers were from 150-60 across the board. I ran an injector flush through with the pump disconnected and even swapped coils to see if it was that. Also I disconnected each injector one at a time and felt each cylinder drop. Although the idle runs higher when in closed loop it still has a miss and once it switches over to open loop the idle dips so low that it shuts off everytime. I'm really stumped as to what it could be. I was thinking it might be the cps but i took it out and its reading some resistance. Does anyone know how many ohms it should read? Well I know this is a doozy of a post but any help is greatly appreciated.
    Arthur B.
    oh and also here are the mods the engine has.
    aem intake
    turboxs bov
    3inch exhaust without cat(too dirty to read the badge lol)
    thats it i believe.

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  3. #2
    Registered User Findus11's Avatar
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    Nov 2007
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    Ketchum, Idaho
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    get your hands on a stock bov and a stock intake or a cobb intake. Does it have a tune? Because subies NEED a tune with a catless exhaust. Those are the only things I can think of. But i dont know if a BOV and an intake can make it run so bad. I would make sure it has a stage 2 tune. Thats what it needs
    Hawk Eye #1991
    Dirty Crew #11
    Military Militia #1991
    I still don't know how I got this car...

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