Bogging/no power/jerking
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This is a discussion on Bogging/no power/jerking within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hello i have a 2002 wrx with 102k on it. Recently i put a downipe on it but i put ...

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    Registered User wrxwagon2's Avatar
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    Bogging/no power/jerking

    Hello i have a 2002 wrx with 102k on it. Recently i put a downipe on it but i put the stock one back on because i thought it might be the problem. I reset my computer so the check engine light isnt on yet but by car at idle when i hit the gas it studders then revs. also it jerks really bad at low rpms and has no power around 5k and really 50% power all around the rpm range. So im gonna get it scanned this weekend if the check engine light returns but i was wondering if anyone had any ideas. Thanks
    2004 WRX (currently driving)
    2000 Audi S4 APR tuned (sold)
    2002 WRX wagon ( sold )
    1988 Thunderbird Turbocoupe

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    UnBanned Sinister's Avatar
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    Quote Originally Posted by wrxwagon2 View Post
    Hello i have a 2002 wrx with 102k on it. Recently i put a downipe on it but i put the stock one back on because i thought it might be the problem. I reset my computer so the check engine light isnt on yet but by car at idle when i hit the gas it studders then revs. also it jerks really bad at low rpms and has no power around 5k and really 50% power all around the rpm range. So im gonna get it scanned this weekend if the check engine light returns but i was wondering if anyone had any ideas. Thanks
    First... do you have a boost gauge?
    Second... did you do the O2 sensor fix like you're supposed to?
    Third... do you have EM?
    Fourth... do you have the stock up-pipe?

    I have a bad feeling this could be the cat in the up-pipe fragmenting. If you don't have a CEL, but you have 50% power in the full range.. then the cat could've fragmented into your turbo. That's why I want to know if you have a boost gauge.

    Just to be sure.. the Cruise Control light isn't blinking, is it?
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    Admiral Ackbar mycologist's Avatar
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    Also kind of sounds like a fuel filter.
    Last edited by mycologist; 05-27-2009 at 03:51 PM.
    "From a little spark may burst a mighty flame." - Dante
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    UnBanned Sinister's Avatar
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    Quote Originally Posted by mycologist View Post
    Also kind of sounds like a fuel filter.
    True.. it is at 100k+ miles...
    Kevin
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    Registered User wrxwagon2's Avatar
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    ok so i just got back from autozone and they scanned it and the code P0171 came up which is either a faulty MAF sensor, vacum leak, low fuel pressure, or a plugged injector/ cylinder misfire. So what i did so far was clean the MAF and put injector cleaner in. I have a feeling it might be he fuel filter too. Idk what to buy first though because a new MAF is $180 and if i buy that and thats not the problem i just wasted 180 dollars.
    2004 WRX (currently driving)
    2000 Audi S4 APR tuned (sold)
    2002 WRX wagon ( sold )
    1988 Thunderbird Turbocoupe

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    Registered User wrxwagon2's Avatar
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    Also i was wondering if after i do all these things to try to get the CEL off do i have to reset the ecu and drive it and see if it comes back on? or do i just drive it with the light on and see if it goes off? thanks
    2004 WRX (currently driving)
    2000 Audi S4 APR tuned (sold)
    2002 WRX wagon ( sold )
    1988 Thunderbird Turbocoupe

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    Registered User Pactin's Avatar
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    Quote Originally Posted by wrxwagon2 View Post
    Also i was wondering if after i do all these things to try to get the CEL off do i have to reset the ecu and drive it and see if it comes back on? or do i just drive it with the light on and see if it goes off? thanks
    it won't turn off til you fix the problem. once u do, just reset.
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    Admiral Ackbar mycologist's Avatar
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    Quote Originally Posted by wrxwagon2 View Post
    Also i was wondering if after i do all these things to try to get the CEL off do i have to reset the ecu and drive it and see if it comes back on? or do i just drive it with the light on and see if it goes off? thanks
    Do the filter first, or both. The filter is a no brainer, it is good maintenance and it is cheap.

    Reset and see if it comes back.
    "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 JUSTINSNUTSWINGER's Avatar
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    Can of Seafoam works wonders for the filter and injectors. Just a thought.
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    Registered User wrxwagon2's Avatar
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    put a new fuel filter on and it smoothed out the idle but its still cuts some power out around 5 thousand rpm, thinking i need a new MAF..
    2004 WRX (currently driving)
    2000 Audi S4 APR tuned (sold)
    2002 WRX wagon ( sold )
    1988 Thunderbird Turbocoupe

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    Registered User wrx0131's Avatar
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    Quote Originally Posted by wrxwagon2 View Post
    put a new fuel filter on and it smoothed out the idle but its still cuts some power out around 5 thousand rpm, thinking i need a new MAF..
    They usually go hand in hand. I had the same problem; I replaced my fuel filter and it slightly fixed the problem. Then my car started running lean and i destroyed one of my pistons. Turned out to be a bad MAF sensor. Get that replaced ASAP.
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    Admiral Ackbar mycologist's Avatar
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    Quote Originally Posted by wrxwagon2 View Post
    put a new fuel filter on and it smoothed out the idle but its still cuts some power out around 5 thousand rpm, thinking i need a new MAF..
    Reset your ECU?
    "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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    Admiral Ackbar mycologist's Avatar
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    Quote Originally Posted by wrx0131 View Post
    They usually go hand in hand. I had the same problem; I replaced my fuel filter and it slightly fixed the problem. Then my car started running lean and i destroyed one of my pistons. Turned out to be a bad MAF sensor. Get that replaced ASAP.
    That is a bummer. Bad or dirty MAFs usually go with oil based air filters. I can't figure how the MAF failing would be related to the fuel filter in any way though.
    "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 wrx0131's Avatar
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    Quote Originally Posted by mycologist View Post
    That is a bummer. Bad or dirty MAFs usually go with oil based air filters. I can't figure how the MAF failing would be related to the fuel filter in any way though.
    Sorry i meant to say that they both have similar symptoms, so sometimes it could be either/or.
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    Admiral Ackbar mycologist's Avatar
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    Quote Originally Posted by wrx0131 View Post
    Sorry i meant to say that they both have similar symptoms, so sometimes it could be either/or.
    Ah, makes sense.
    "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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