Fouling plugs...P0302...Help...
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This is a discussion on Fouling plugs...P0302...Help... within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I will try to make this simple... Car is 2003 WRX Wagon. When purchased it was stock, except SPT cat-back ...

  1. #1
    Registered User pweizman's Avatar
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    Fouling plugs...P0302...Help...

    I will try to make this simple...

    Car is 2003 WRX Wagon. When purchased it was stock, except SPT cat-back (76K on it) threw a P0302 code the day I bought it. Battery and #2 plug replaced by dealer because it was fouled. I was told car had the 60K service done by PO.

    1 year later (90K on car):
    Car has UP, Bosal shorty divorced wastegate DP, SPT cat-back, stock main cat. No other mods.

    Car was Dyno tuned by Dynoflash about 8 months ago (didn't have UP on at the time). Put down around 200 / 200 conservatively. I was running out of fuel up top. He backed boost down, and made it nice and safe. He had to put my car on the charger because he said my voltage was low...during tuning (and this was a 2 month old Subaru battery!)

    I replaced the fuel filter a few months after my dyno tune, and found I made more boost (max 17 psi in 3rd gear WOT) afterwards. I am guessing the FF was partially clogged.

    I replaced the stock UP with a generic catless UP a few months later. Car ran great. I didn't get it retuned either........

    Yesterday, I got another check engine light..and it was found to be P0302 again by the dealer, another fouled #2 plug! They say it is because I am tuned, and my a/fs are out of range rich. Even though I fouled the same plug bone stock!

    The plug was visably black with soot. Def. running RICH.

    What say you gurus? Do I need retuned? Do I need a step hotter plugs? Do I need a new battery? Do I need to flog my car more?

    CN: Fouled #2 plug...second time! What gives?

    Thanks,
    Patrick
    RSX-S
    Sold: '03 WRX Wagon (bugeyes rock!)

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  3. #2
    Registered User pweizman's Avatar
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    No thoughts...???
    RSX-S
    Sold: '03 WRX Wagon (bugeyes rock!)

  4. #3
    Moderator Donkey's Avatar
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    First try listing what plugs and the gap you are using.Second,buy a wideband. You gotta pay to play.....
    Resident Adviser @ WTF Tuning, LLC
    2002 FORESTER S
    1998 FORESTER S




  5. #4
    Registered User pweizman's Avatar
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    Quote Originally Posted by Donkey View Post
    First try listing what plugs and the gap you are using.Second,buy a wideband. You gotta pay to play.....
    Stock plugs, and I am assuming stock gap...as they were installed by the dealer.

    Car was tuned with a wideband....

    Patrick
    RSX-S
    Sold: '03 WRX Wagon (bugeyes rock!)

  6. #5
    Moderator Donkey's Avatar
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    Quote Originally Posted by pweizman View Post
    Stock plugs, and I am assuming stock gap...as they were installed by the dealer.

    Car was tuned with a wideband....

    Patrick
    What AFR's was it tuned for?What are the AFR's now?Need a wideband to know.Try cleaning the MAF sensor.I would pull the plugs and get a part # off them.I have seen the stealership put the wrong plugs in before.They used ones for a 2.5L.
    Resident Adviser @ WTF Tuning, LLC
    2002 FORESTER S
    1998 FORESTER S




  7. #6
    Registered User pweizman's Avatar
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    Don't know what APR I was tuned to.

    I told him...SAFE.

    I will check the part number of the plugs.

    I think it could be that I drive like a granny too. I think I need to blow out some carbon more often!

    Patrick
    RSX-S
    Sold: '03 WRX Wagon (bugeyes rock!)

  8. #7
    Admiral Ackbar the 1st mycologist's Avatar
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    Replaced FF, now more fuel = rich??
    "From a little spark may burst a mighty flame." - Dante
    "The stitch is lost unless the thread is knotted." - Italian proverb

  9. #8
    Registered User pweizman's Avatar
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    Quote Originally Posted by mycologist View Post
    Replaced FF, now more fuel = rich??
    Yep...but that doesn't explain when I was bone stock, and fouled the same plug.

    Maybe that was just a fluke.

    I will investigate getting retuned.

    I think the mean time, I will flog my car more to burn off carbon deposits, run more fuel cleaner through it...and check my plugs more often.

    Patrick
    RSX-S
    Sold: '03 WRX Wagon (bugeyes rock!)

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