2002 wrx misfire! PLEASE HELP! PLEASe!!!
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This is a discussion on 2002 wrx misfire! PLEASE HELP! PLEASe!!! within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hello, I have a really bad misfire in my 2002 subaru wrx. I have had the car for about a ...

  1. #1
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    2002 wrx misfire! PLEASE HELP! PLEASe!!!

    Hello,
    I have a really bad misfire in my 2002 subaru wrx.
    I have had the car for about a year now.
    it has 91000 miles on it.

    Mods:
    HKS turbo back exhaust
    Turbo Xs FMIC
    HKS type s bov
    turbo xs short ram intake
    COBB accessport V2


    Ok so here is my story,
    I got this car stock from a dealership with 80,000.
    I started to add modifications to the car. I got a 20G turbo with a 800cc injectors setup, high flow up pipe, and a COBB pro tune from alige automotive in maryland. Took the car home for the first day after everything was completed. I was breaking the car in, running around 17-18 PSI. Everything seemed to me working fine. Steady boost, Clean acceleration, no problems whatsoever. After about an hour of me toying with the new setup, the car starts to misfire, BADLY. So i decided to turn the boost down to a safe 10psi. The car ran great, normally. But now when i take the boost over 10 psi it misfires and stutters BADLY! The check engine light blinks, and throws 4 codes. 1,2,3 and 4 cylinders misfire code. I can take the car back under 10 PSI and it will run perfectly, even at redline. I took it to the dealership and they had no idea. They said they couldn't help me because of all the modifications i had done. I checked everything, to spark plugs, vacuum leaks, MAF, the pro tune, i even changed the MAF and cleaned out my inter cooler & piping. Changed spark plugs, Checked the spark plug gaps. I DID EVERYTHING I COULD POSSIBLY THINK OF! I tried running 103 octane. Still nothing. I'm going crazy.


    OK so here is the funny part.

    I'm pretty good with automotive mechanics & turboed cars,
    So i decided to take everything off and change it back to stock. Since i still had all of the stock parts and could do all the labor myself. So i put the TDO-4 stock wrx turbo back on, and the stock 465cc blue injectors, and the stock cobb accessport map. AND THE CAR DOES THE SAME THING! It will run perfectly under 10 PSI but when i take it over 10, It misfires and stutters BADLY.. Im ready to give the car back, i cant take it.

    IF ANYONE CAN THINK OF ANYTHING! PLEASE REPLY TO THIS POST!


    IM BEGGING YOU GUYS FOR HELP!

    please!

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  3. #2
    Registered User EvoEatr's Avatar
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    Quote Originally Posted by subbyrex View Post
    Hello,
    I have a really bad misfire in my 2002 subaru wrx.
    I have had the car for about a year now.
    it has 91000 miles on it.

    Mods:
    HKS turbo back exhaust
    Turbo Xs FMIC
    HKS type s bov
    turbo xs short ram intake
    COBB accessport V2


    Ok so here is my story,
    I got this car stock from a dealership with 80,000.
    I started to add modifications to the car. I got a 20G turbo with a 800cc injectors setup, high flow up pipe, and a COBB pro tune from alige automotive in maryland. Took the car home for the first day after everything was completed. I was breaking the car in, running around 17-18 PSI. Everything seemed to me working fine. Steady boost, Clean acceleration, no problems whatsoever. After about an hour of me toying with the new setup, the car starts to misfire, BADLY. So i decided to turn the boost down to a safe 10psi. The car ran great, normally. But now when i take the boost over 10 psi it misfires and stutters BADLY! The check engine light blinks, and throws 4 codes. 1,2,3 and 4 cylinders misfire code. I can take the car back under 10 PSI and it will run perfectly, even at redline. I took it to the dealership and they had no idea. They said they couldn't help me because of all the modifications i had done. I checked everything, to spark plugs, vacuum leaks, MAF, the pro tune, i even changed the MAF and cleaned out my inter cooler & piping. Changed spark plugs, Checked the spark plug gaps. I DID EVERYTHING I COULD POSSIBLY THINK OF! I tried running 103 octane. Still nothing. I'm going crazy.


    OK so here is the funny part.

    I'm pretty good with automotive mechanics & turboed cars,
    So i decided to take everything off and change it back to stock. Since i still had all of the stock parts and could do all the labor myself. So i put the TDO-4 stock wrx turbo back on, and the stock 465cc blue injectors, and the stock cobb accessport map. AND THE CAR DOES THE SAME THING! It will run perfectly under 10 PSI but when i take it over 10, It misfires and stutters BADLY.. Im ready to give the car back, i cant take it.

    IF ANYONE CAN THINK OF ANYTHING! PLEASE REPLY TO THIS POST!


    IM BEGGING YOU GUYS FOR HELP!

    please!


    So when you FIRST bought the car with all the stock parts did it do this?

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    Quote Originally Posted by EvoEatr View Post
    So when you FIRST bought the car with all the stock parts did it do this?

    No it ran perfectly. Like a regular stock 2002 wrx would.
    I test drove a couple a this one seemed to be the best.
    It was set at 15 PSI when i got it from the dealership.
    Ran perfect at that boost level for 3 months before i made the upgrades.

  5. #4
    He simply abides. SD_GR's Avatar
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    I'm stumped and will read on to hopefully learn something. Are you sure the map used with the stock parts was a stock map? Do you have any data from the time the misfire events occur? If so, post them and see if anyone can sort it.
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    Quote Originally Posted by SD_GR View Post
    I'm stumped and will read on to hopefully learn something. Are you sure the map used with the stock parts was a stock map? Do you have any data from the time the misfire events occur? If so, post them and see if anyone can sort it.
    I have tried using COBBs stage 2 map and it does the same thing. I'm not too familiar with data logging? are you referring to data logging with the accessport? and could i get basic instructions on how to data log and what data would be most helpful?

    thanks

  7. #6
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    Quote Originally Posted by subbyrex View Post
    Hello,
    I have a really bad misfire in my 2002 subaru wrx.
    I have had the car for about a year now.
    it has 91000 miles on it.

    Mods:
    HKS turbo back exhaust
    Turbo Xs FMIC
    HKS type s bov
    turbo xs short ram intake
    COBB accessport V2


    Ok so here is my story,
    I got this car stock from a dealership with 80,000.
    I started to add modifications to the car. I got a 20G turbo with a 800cc injectors setup, high flow up pipe, and a COBB pro tune from alige automotive in maryland. Took the car home for the first day after everything was completed. I was breaking the car in, running around 17-18 PSI. Everything seemed to me working fine. Steady boost, Clean acceleration, no problems whatsoever. After about an hour of me toying with the new setup, the car starts to misfire, BADLY. So i decided to turn the boost down to a safe 10psi. The car ran great, normally. But now when i take the boost over 10 psi it misfires and stutters BADLY! The check engine light blinks, and throws 4 codes. 1,2,3 and 4 cylinders misfire code. I can take the car back under 10 PSI and it will run perfectly, even at redline. I took it to the dealership and they had no idea. They said they couldn't help me because of all the modifications i had done. I checked everything, to spark plugs, vacuum leaks, MAF, the pro tune, i even changed the MAF and cleaned out my inter cooler & piping. Changed spark plugs, Checked the spark plug gaps. I DID EVERYTHING I COULD POSSIBLY THINK OF! I tried running 103 octane. Still nothing. I'm going crazy.


    OK so here is the funny part.

    I'm pretty good with automotive mechanics & turboed cars,
    So i decided to take everything off and change it back to stock. Since i still had all of the stock parts and could do all the labor myself. So i put the TDO-4 stock wrx turbo back on, and the stock 465cc blue injectors, and the stock cobb accessport map. AND THE CAR DOES THE SAME THING! It will run perfectly under 10 PSI but when i take it over 10, It misfires and stutters BADLY.. Im ready to give the car back, i cant take it.

    IF ANYONE CAN THINK OF ANYTHING! PLEASE REPLY TO THIS POST!


    IM BEGGING YOU GUYS FOR HELP!

    please!
    Do yourself a favor and take the ram air intake the bov off and just run the stage 2 base map it should run better.

  8. #7
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    Quote Originally Posted by Tegy View Post
    Do yourself a favor and take the ram air intake the bov off and just run the stage 2 base map it should run better.
    tried using the stock intake and intercooler. and bpv

  9. #8
    Registered User Skreekin's Avatar
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    Bring it back to your tuner. See if they can data log and see where the issue is.
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  10. #9
    Registered User Graham46's Avatar
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    +1, why would you take it back to the dealer instead of Agile? Im sure they will have a better idea of whats going on
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  11. #10
    Registered User oguitar's Avatar
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    Get a compression test to make sure the engine is still healthy.
    Life is like riding a bicycle in order to keep your balance you must keep moving.

  12. #11
    Registered User EvoEatr's Avatar
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    Quote Originally Posted by oguitar View Post
    Get a compression test to make sure the engine is still healthy.
    +1 ^..my thought exactly...if it ran great from the get go than after the mods where installed it ran like crap....hmmm....

  13. #12
    Good news, everyone! xxxxxxxAnub1s's Avatar
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    I don't see a fuel pump on that list. I'd be highly suspect of it if you had it tuned on the stock pump, which is just foolish to start with.

    Get the compression test done and do a fuel pressure test as well to make sure your pump is working correctly.
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