im turning to you guys.. help
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This is a discussion on im turning to you guys.. help within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I spent a day at the deal letting a tech look at it. My car is not putting out any ...

  1. #1
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    im turning to you guys.. help

    I spent a day at the deal letting a tech look at it. My car is not putting out any boost except wastagte pressure(5-7psi). At first i didnt throw a cell while driving around. Then a couple miles later i thre P0171 (system too lean; bank 1). the tech changed my af sensor and reset the ecu so im guess that is way it worked for a little while. My light came on again but still p ulled full boost(13 psi) for about 50 miles and then it cut boost and all i had was wg pressure. I change from the stock BPV to my VTA BOV and went and drove it around. The boost came back but the light stayed on. about 25 miles after with BOV still on, It cut boost again and that is where im at.

    02 wrx
    K&N typhoon Cold Air intake
    BOV
    Catless up and down pipe
    HKS high power exhaust



    the tech said it could be because i have no back pressure whatsoever.. is this true sinc ei have a free flowing exhaust?

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  3. #2
    Registered User powder's Avatar
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    Quote Originally Posted by sammyswrxsti View Post
    I spent a day at the deal letting a tech look at it. My car is not putting out any boost except wastagte pressure(5-7psi). At first i didnt throw a cell while driving around. Then a couple miles later i thre P0171 (system too lean; bank 1). the tech changed my af sensor and reset the ecu so im guess that is way it worked for a little while. My light came on again but still p ulled full boost(13 psi) for about 50 miles and then it cut boost and all i had was wg pressure. I change from the stock BPV to my VTA BOV and went and drove it around. The boost came back but the light stayed on. about 25 miles after with BOV still on, It cut boost again and that is where im at.

    02 wrx
    K&N typhoon Cold Air intake
    BOV
    Catless up and down pipe
    HKS high power exhaust



    the tech said it could be because i have no back pressure whatsoever.. is this true sinc ei have a free flowing exhaust?
    In a word, NO. Backpressure helps nothing.

    I would highly recommend puting your stock bpv back on also and i'd try puting your stock intake back on. It could be messing with your MAF readings and screwing up your a/f.

    Who's this tech that you took it to anyways? Not Subaru i hope?
    Blobeye Syndicate #2004
    Military Militia #30-06

    2004 WRX - JBP:Stage 2:13.93 @ 96

    Wingless alas. Too bad it took a 50 ton truck to make it happen.

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    it was flow subaru in winston salem. nc. I dont have my stock intake. I had the stock BPV on and it had cut boost... i took it off and put the BOV on and now the problem goes and comes more

    if i let it sit for a while itll do right for about 15- 20 minutes(with the light on but full boost) IMO i think it has something to do with heat

  5. #4
    Registered User powder's Avatar
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    That bothers me that a subaru tech told you lack of backpressure might be doing it.
    Blobeye Syndicate #2004
    Military Militia #30-06

    2004 WRX - JBP:Stage 2:13.93 @ 96

    Wingless alas. Too bad it took a 50 ton truck to make it happen.

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    Yep.. i have posted on nasioc too but noone has responded...Ive got a friend going to let me borrow his intake and see.... how long should i wait to see if it is it?... so backpressure has nothing to do with it im guessing??
    I knew something was wrong when i went back to them to get an exhaust bolt and they were like.. we would have to order that.. we dont have it here.. yea.. bull.. i walked in to the shop to the tech that told me bkpressure could be whats doing it and was like... do you have a bolt like this.. he went and got one. I dont know if this amount to anything but i tried pusshing on my BPV valve while i had it off... and to be honest.. it has ALOT OF PRESSURE BEHIND IT.. alot more that the BOV??!! should they be almost the same?.. this is causing my gas to go.. bye bye.. i had cleaned my MAF when i recharged my k&n filter on my typhoon... i put a resonable amount of filter oil on it... what should i do?

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    Registered User wrxisthebest's Avatar
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    backpressure?????

    your turbo should be covering that???
    well u know what i mean!!
    its not a na vehicle if u have a straight pipe it shouldnt even matter cause it is after the turbo!!!!

    that scares me that is why i dont go to dealerships!

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    if i let it sit for 5-15 mins itll get full boost but still have cel for about 5 or ten minutes.. then cuts boost again

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