02 wrx sputters with boost controller on
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This is a discussion on 02 wrx sputters with boost controller on within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hi guys i bought a 02 wrx about 2 months ago and it has a bad sputter and flashing check ...

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    Registered User lamers24's Avatar
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    02 wrx sputters with boost controller on

    Hi guys i bought a 02 wrx about 2 months ago and it has a bad sputter and flashing check engine light at high rpm only with the electronic boost controller on. I have replaced the plugs twice and properly gapped them just to be sure. The mass air flow sensor and fuel filter were also just replaced. The car also had a custom dyno tune done. I did recently discover that the car also does have a manual boost controller under the hood so i turned it all the way down with the problem still persisting and im wondering if the vaccuum lines would be wrong having the manual and electronic boost controllers both installed.by the way the car also has a aem intake and full injen ses exauast. If both boost controllers are turned off all the way the car runs like it normally should with no problems.

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    He simply abides. SD_GR's Avatar
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    Search "fuel cut."
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    Registered User MainFrame's Avatar
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    At what boost pressure does it start cutting out?



    I had a similar problem that took about two years to diagnose.. in the end new coil packs along with cleaning every ground in the engine bay fixed it.

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    Registered User lamers24's Avatar
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    it seems to be around 10 psi and above

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    Admiral Ackbar mycologist's Avatar
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    Can you get any specifics about how it was tuned? If it properly done, a hybrid boost control setup with the MBC and EBC is the best you can get.

    new hybrid mbc/ebc method of boost control - NASIOC

    What are all the CEL codes it has stored?
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    Registered User lamers24's Avatar
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    it wasnt any kind of hybrid tune neither me or the tuner at knew about it at the time. I had it tuned 2 weeks after buying the car after hearing horror stories of the ebc and no tune to go with it.

    and i havent got a chance to check codes yet hopefully by the end of the weekend i will have some

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    Admiral Ackbar mycologist's Avatar
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    Kind of unbelievable he wouldn't notice that. I'd be wanting a refund, or if you still trust him at all a free retune.
    "From a little spark may burst a mighty flame." - Dante
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    Registered User lamers24's Avatar
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    checking for boost leaks today and noticed i had a leaky valve cover gasket would this have anything to do with the problem?
    Last edited by lamers24; 03-26-2012 at 02:16 PM.

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    Admiral Ackbar mycologist's Avatar
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    You really need to start at this by posting the CEL codes as I asked. Get them read ASAP as that is much more useful information than what you are working with / providing.

    The valve cover gasket - no I don't think so. Although I don't think you should have had too much pressure in there if your intake valves were closed for the test and the oil filler cap removed. I'm not really sure about that but I think it would have to come past the rings or valve seals? I wonder if your motor is running low compression now.
    "From a little spark may burst a mighty flame." - Dante
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    Registered User lamers24's Avatar
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    thanks for the fast reply i will get the codes read and get the mbc changed out hopefully by wensday

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    Registered User lamers24's Avatar
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    went and got the codes scanned today and they came back
    po546 - exhaust gas temature sensor circuit high bank 1
    po483 - cooling fan rationality check

  13. #12
    Admiral Ackbar mycologist's Avatar
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    Po546 - that is a bad or missing EGT sensor in the uppipe. Is the uppipe stock? If it has a cat in it you should replace the sensor. If it has no cat you should remove the sensor if it is there so it doesn't send pieces into the turbo. Plug the whole with a bung plug. Then disable the CEL in the tune (if you have no cat your tuner should have done this).

    You need to find another tuner. I'd recommend pulling the MBC completely and run the stock boost control system, with the correct ID tubing, restrictor pill, and t fitting, but I have no idea how it is going to react (possibly overboost badly) with the map you currently have on.
    "From a little spark may burst a mighty flame." - Dante
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    Admiral Ackbar mycologist's Avatar
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    po483 - Your car decided it was hot and qued the fans. After a certain time the temp. did not go down. Make sure your radiator fan system is working correctly. Also check that their is airflow through the radiator and no air bubbles in the cooling system etc.

    When you get both of these issues addressed, I think your car will come out of limp mode.
    "From a little spark may burst a mighty flame." - Dante
    "The stitch is lost unless the thread is knotted." - Italian proverb

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    Registered User lamers24's Avatar
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    there is no cat and the car does have a egt gauge which does funtion properly and the new vacuum lines and pill will be in thursday thanks for all the help so far

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    Registered User lamers24's Avatar
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    so i put the pill in and rerouted the lines and that seemed to fix the sputtering problem but im still getting the flashing cel at around 4k and the car seems to hesitate a bit then continues on fine through the rest of the gear and also like you said the car seems to be overboosting on this map now

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