Question about Subaru Impreza WRX STi

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Hello this problem has been confusing and well past my knowledge of Subaru. So i just finishd puttin a brand new 05sti tranny into my 02 wrx, the problem has been since i got it running when i reach beetween 4700 rpm and 5100 rpm my car sputters hessitates, missfires we put a code reader on it and it said all 4 cylinders were miss firing and recomended new spark plugs so i put a set of ngk platnium in check the coils, then we reset the computer check engine ligh went off drive great no problems at all after about 10 minutes the problem recurred, went to cost less got new fuel filter but the problem remained. seems like a sensor problem but the only sensor i do not have in my vehicle is a speedo sensor would that have any effect on how my car drove, ohh CAN ANY ONE HELP?

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Just so you know you can't use platnum plugs on a compressed turbo motor, they won't spark right under boost. Try using copper plugs they work better for forced induced motors.

Posted on Oct 19, 2012

  • jmc_2099
    jmc_2099 Oct 19, 2012

    Just so you know you can't use platnum plugs on a compressed turbo motor, they won't spark right under boost. Try using copper plugs they work better for forced induced motors.


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Sometimes bad coil packs or wireing can give the same code,so i would start testing the coils first then if there ok,move on to checking the wireing to them.and check for shorts too.

Posted on Mar 15, 2011


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