No boost problem
Page 1 of 2 12 LastLast
Results 1 to 15 of 26

This is a discussion on No boost problem within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I have a 2002 wrx with a VF-39 and a GM BCS, and stock BOV, it was running great and ...

  1. #1
    Registered User
    Join Date
    May 2010
    Posts
    18

    No boost problem

    I have a 2002 wrx with a VF-39 and a GM BCS, and stock BOV, it was running great and then all of a sudden yesterday i went to get on it and there was no boost. My car still runs fine idles fine accelerates fine, its like nothing is wrong its not even smoking but you can smell that it is running rich. vacuum is reading 20 psi and idle but when i accelerate and should be hitting boost the gauge just sits at 0 pounds still not smoking or running any different then idle but there is absolutely no boost. Does anybody know what could be wrong, and how to test it????
    Last edited by Slowbaroo; 06-21-2010 at 04:44 PM.

  2. Remove Advertisements
    ClubWRX.net
    Advertisements
     

  3. #2
    Good news, everyone! xxxxxxxAnub1s's Avatar
    Join Date
    Jan 2005
    Location
    Eh, whaaaaa?
    Posts
    3,855
    I Support ClubWRX
    Take a look at the wastegate actuator, the valve could be stuck closed.
    Cody
    Hawk-Eye Alliance #727 N.E.R.D #255.255.255.0

    Your nighttime volunteer of near-useless information.
    Good news, everyone!

  4. #3
    UnBanned Sinister's Avatar
    Join Date
    Nov 2006
    Location
    Denver Metro Area
    Posts
    17,627
    I Support ClubWRX
    if the wastegate was stuck closed... then he'd be overboosting. It may be open. Wastegate pressure is 7psi, so if a vac line was busted, or the BCS wasn't working... then you'd be boosting to 7psi... But depending on where you're reading your boost pressure from... That may be the case.
    Kevin
    Moderator
    Sinister's Blowoff Valve FAQ
    WRX Gas Mileage FAQ
    Sinister's Progress Thread - 430whp 429wtq - Sold
    Firearms Enthusiasts Thread

    The Sheriff's Star at the bottom left corner rates a user's reputation.
    If you found a user's post to be helpful or quite the opposite, please make it known to them by clicking the Star!

  5. #4
    Registered User
    Join Date
    May 2010
    Posts
    18
    I am reading boost pressure from the BOV

  6. #5
    UnBanned Sinister's Avatar
    Join Date
    Nov 2006
    Location
    Denver Metro Area
    Posts
    17,627
    I Support ClubWRX
    Do you have an aftermarket up pipe?

    This sounds suspiciously like a turbo that got hit with shrapnel and seized up.

    The only things this could reasonably be are:
    The wastegate arm is stuck in the open position.
    The oil coked and your bearings in the turbo siezed.
    the turbo FODded out (FOD Foreign Object Debris... a.k.a. the pre-turbo catalytic converter, also called the precat, had a chunk let loose and jam the turbine wheel)
    Kevin
    Moderator
    Sinister's Blowoff Valve FAQ
    WRX Gas Mileage FAQ
    Sinister's Progress Thread - 430whp 429wtq - Sold
    Firearms Enthusiasts Thread

    The Sheriff's Star at the bottom left corner rates a user's reputation.
    If you found a user's post to be helpful or quite the opposite, please make it known to them by clicking the Star!

  7. #6
    Good news, everyone! xxxxxxxAnub1s's Avatar
    Join Date
    Jan 2005
    Location
    Eh, whaaaaa?
    Posts
    3,855
    I Support ClubWRX
    Thanks for the correction Sinister, apologies for the typo.
    Cody
    Hawk-Eye Alliance #727 N.E.R.D #255.255.255.0

    Your nighttime volunteer of near-useless information.
    Good news, everyone!

  8. #7
    UnBanned Sinister's Avatar
    Join Date
    Nov 2006
    Location
    Denver Metro Area
    Posts
    17,627
    I Support ClubWRX
    Quote Originally Posted by Anub1s View Post
    Thanks for the correction Sinister, apologies for the typo.
    Kevin
    Moderator
    Sinister's Blowoff Valve FAQ
    WRX Gas Mileage FAQ
    Sinister's Progress Thread - 430whp 429wtq - Sold
    Firearms Enthusiasts Thread

    The Sheriff's Star at the bottom left corner rates a user's reputation.
    If you found a user's post to be helpful or quite the opposite, please make it known to them by clicking the Star!

  9. #8
    Registered User
    Join Date
    May 2010
    Posts
    18
    should i be able to move the waste gate actuator all the way back with my hand with only using a little bit of force?

  10. #9
    UnBanned Sinister's Avatar
    Join Date
    Nov 2006
    Location
    Denver Metro Area
    Posts
    17,627
    I Support ClubWRX
    Quote Originally Posted by Slowbaroo View Post
    should i be able to move the waste gate actuator all the way back with my hand with only using a little bit of force?
    There is a 7lb spring in there... so it'll take a bit of a push.

    Do you have an upgraded up pipe?
    Kevin
    Moderator
    Sinister's Blowoff Valve FAQ
    WRX Gas Mileage FAQ
    Sinister's Progress Thread - 430whp 429wtq - Sold
    Firearms Enthusiasts Thread

    The Sheriff's Star at the bottom left corner rates a user's reputation.
    If you found a user's post to be helpful or quite the opposite, please make it known to them by clicking the Star!

  11. #10
    Registered User
    Join Date
    May 2010
    Posts
    18
    ya i do but i dont know what kind it is i bought the car with it on

  12. #11
    UnBanned Sinister's Avatar
    Join Date
    Nov 2006
    Location
    Denver Metro Area
    Posts
    17,627
    I Support ClubWRX
    Quote Originally Posted by Slowbaroo View Post
    ya i do but i dont know what kind it is i bought the car with it on
    does the up pipe have a catalytic converter?
    Kevin
    Moderator
    Sinister's Blowoff Valve FAQ
    WRX Gas Mileage FAQ
    Sinister's Progress Thread - 430whp 429wtq - Sold
    Firearms Enthusiasts Thread

    The Sheriff's Star at the bottom left corner rates a user's reputation.
    If you found a user's post to be helpful or quite the opposite, please make it known to them by clicking the Star!

  13. #12
    NRD
    NRD is offline
    Registered User
    Join Date
    Jun 2010
    Location
    Rialto
    Posts
    12
    i agree with sinister...but here is another way to check (if you have time and you are mechanically inclined)
    grab yourself a:
    1. 3/8 ratchet. 10mm, 12mm, 14mm, 17mm sockets.
    2. 1/4 inch ratchet. 8mm, 10mm sockets
    3. 3-6 inch extension for a 3/8 ratchet
    4. alot of rags
    5. some oil (5w30)
    6. coolant
    7. flat head screwdriver

    first, remove your intercooler completely. take the heat sheild off of the turbo. remove the oil supply line on the top of the turbo. remove the coolant supply line from the side of the turbo. depending on what make/model your car is, it might have a coolant return line on the opposite side of the turbo too, if it does, remove that as well. after you have removed all of that, remove your down pipe. remove your turbo inlet hose. now that you have everything disconnected from your turbo, its time to remove it. there are 3 14mm nuts that hold it in place. remove those. after that you should be able to pull it off of the up pipe. keep in mind, there is an oil return line on the bottom of your turbo. make sure when you install the turbo, you slip it back to where it belongs or you will have oil spilling everywhere.

    once you get the turbo off, check it theroughly, check for shaft play, schrap metal, wastegate abnormalities, or anything out of the ordinary.

    make sure you check all of your intercooler couplers and seals too, because if your turbo is fine, you might have a boost leak.

    hope you found my answer helpful


    Quote Originally Posted by Sinister View Post
    Do you have an aftermarket up pipe?

    This sounds suspiciously like a turbo that got hit with shrapnel and seized up.

    The only things this could reasonably be are:
    The wastegate arm is stuck in the open position.
    The oil coked and your bearings in the turbo siezed.
    the turbo FODded out (FOD Foreign Object Debris... a.k.a. the pre-turbo catalytic converter, also called the precat, had a chunk let loose and jam the turbine wheel)

  14. #13
    Registered User
    Join Date
    May 2010
    Posts
    18
    Thanks for the help NRD i will do that and let you know how things look once it is done

  15. #14
    NRD
    NRD is offline
    Registered User
    Join Date
    Jun 2010
    Location
    Rialto
    Posts
    12
    nooooooo prob bud. pm me if you need anything else

    Quote Originally Posted by Slowbaroo View Post
    Thanks for the help NRD i will do that and let you know how things look once it is done

  16. #15
    UnBanned Sinister's Avatar
    Join Date
    Nov 2006
    Location
    Denver Metro Area
    Posts
    17,627
    I Support ClubWRX
    Quote Originally Posted by NRD View Post
    make sure you check all of your intercooler couplers and seals too, because if your turbo is fine, you might have a boost leak.
    This is very unlikely since he's getting full vacuum but 0psi boost.

    Usually a boost leak will manifest as low boost... not 0 boost.
    Kevin
    Moderator
    Sinister's Blowoff Valve FAQ
    WRX Gas Mileage FAQ
    Sinister's Progress Thread - 430whp 429wtq - Sold
    Firearms Enthusiasts Thread

    The Sheriff's Star at the bottom left corner rates a user's reputation.
    If you found a user's post to be helpful or quite the opposite, please make it known to them by clicking the Star!

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •