2003 wrx serious sputtering and bogging need help
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This is a discussion on 2003 wrx serious sputtering and bogging need help within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; hey guys im new to this forum and im having serious problems with my 2003 wrx bugeye. first bogging and ...

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    Question 2003 wrx serious sputtering and bogging need help

    hey guys
    im new to this forum and im having serious problems with my 2003 wrx bugeye.
    first bogging and sputtering at high load and boost.changed fuel pump and still the same(used pump).
    changed coils plugs O2 sensor still same problem
    cleaned injectors and changed the seals and still the same.
    also checked for leaks nothing at all
    and the boost gauge is normal and stable
    now its bogging and sputtering from 2000-4000rpm.
    another thing, it doesnt sputter and bogg for the first like 15-20seconds on start up even if its cold or hot.whenever i turn it off then on it will act normal and smooth for the first 15-20 seconds.
    any thoughts?

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    and the Funky Bunch Calvinball's Avatar
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    Some more details on the car's history and mods/lack of mods please.
    - Will
    Current Car: 2015 Honduh Civic SIgh
    Previous Cars:2014 Golf TDI, 2012 WRB WRX Hatch, 2004 RSX-S, 1998 Grand Prix GTP
    "Isn't it amazing how smart you feel when you just aren't being stupid?"

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    car mods are:
    sti pinks
    sti tmic
    vf30 turbo
    perrin air intake
    4" downpipe from turbo xs
    also turbo xs uppipe
    it has ej20 with ported and polished heads
    wiseco pistons
    manley conecting rods
    acl bearings
    ....
    it has been like this for three years with no troubles and as for the forged block its done like only 10k miles.

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    also before this problem i had a bad alternator and i changed it

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    Supporting Member livid_wrx's Avatar
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    How do your data logs look? Who did your tune?

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    Captain James of the SS Impreza has gone down with the ship Drews's Avatar
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    Check crank and cam sensors for build up. Personally, I'd replace them, but you may be able to fix the issue by cleaning them.
    Hawk-Eye Alliance #Eleventy,000,000,000|N.E.R.D. Member 20,000
    Stable: 2014 Hyundai Veloster Turbo (Matte Grey), 06 LGT, 03 WRX, 98 RS, 00 OBS


    Resident Clubdub Debbie Downer. I'd love your ideas if you kept them to yourself. Subarus suck, get a new wife.

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    car had the tune when i bought it.i think its a cobb tune
    i have no CEL's.notging at all

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    the strange thing is why when i turn it off then on again it will act normal for the first 15-20 seconds.would these sensors act like this?thanks guys for ur help

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    Registered User XJman's Avatar
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    Yes they can. When mine went out on my old wj Cherokee it would run fine for a short time the sputter and die, restarting would be hit or miss.

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    ok thanks a lot.im gona try to change them today.i already have them from another engine.ill post what happens

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    hi again guys
    changed both sensors and still the same problem

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    Captain James of the SS Impreza has gone down with the ship Drews's Avatar
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    Quote Originally Posted by davidn View Post
    hi again guys
    changed both sensors and still the same problem
    I know you said you changed your plugs, but did you gap them properly? Is your fuel filter clogged? Is your fuel pump dead? Have you gone over all the vacuum connections? Maybe one of your coil packs is dead? I'm just throwing ideas at you here. It's all stuff I'd definitely go over. Double check the work you did, sometimes I forget to do things.
    Hawk-Eye Alliance #Eleventy,000,000,000|N.E.R.D. Member 20,000
    Stable: 2014 Hyundai Veloster Turbo (Matte Grey), 06 LGT, 03 WRX, 98 RS, 00 OBS


    Resident Clubdub Debbie Downer. I'd love your ideas if you kept them to yourself. Subarus suck, get a new wife.

    Never argue with idiots. They'll drag you to their level and beat you with experience.

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    double checked everything man
    gapped the plugs
    all vaccum connections checked
    filter changed
    the only thing is the pump i changed it with a used one and im thinking maybe its from the pump maybe its dead too.
    so i ordered a new one waiting to get it in the comming days.
    but my question is why will it run normally for the first 20 secs after start up
    then it will start sputtering again
    i think like its 80% from the pump.on start up it pressures good and then off?
    i dont know what to do lol

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    also new coil packs btw

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    guys problem has changed now
    now the bogging is a bit less now and something strange now is happening
    when i drive with a 10% throttle the car pulls great and seems fine but when i apply full throttle the car hesitates and the strangest thing is that at 6000-6500 rpm the car cuts off.as if u just turned off ignition
    any thoughts guys?

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