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tdi bora not boosting!!

  • 24-12-2011 3:01am
    #1
    rs8
    Registered Users, Registered Users 2 Posts: 445 ✭✭


    my bora isnt boosting 100pd engine!!

    computer reads n75 boost control valve so i change that and still no joy!! change the other two valve beside that one aswell and still no joy ( had a donar bora)

    also change the map sensor and airflow meter, does anyone have any ideas??

    i also checked the pipes and hoses!

    car will boost when you switch the ignition on and off while moving sometimes!

    cheers for replies

    my guess is waste gate sticking??


Comments

  • #2
    richardsheil
    Registered Users, Registered Users 2 Posts: 691 ✭✭✭richardsheil


    Might be worth sucking on the vac pipe to the turbo actuator and seeing if the actuator is leaking

    See here- there is an instruction that is attached in one of the posts.

    http://www.boards.ie/vbulletin/showthread.php?t=2056478276


  • #3
    Neilw
    Registered Users, Registered Users 2 Posts: 3,795 ✭✭✭Neilw


    Did you get a full scan with vcds? If not you should get that done.

    George Dalton who posts here would be then man for advice on these.


  • #4
    toshy321
    Registered Users, Registered Users 2 Posts: 163 ✭✭toshy321


    Could be got to do with the waste gate allright mate of mine had similar problem and thats what it turned out to be hope ya get it figured out.


  • #5
    George Dalton
    Registered Users, Registered Users 2 Posts: 5,728 ✭✭✭George Dalton


    These use a VNT turbo so don't have a wastegate. Do you possibly mean the variable vane mechanism sticking rather than wastegate?

    You have three options at the moment as I see it:

    1. Continue to throw parts at it until you get lucky.
    2. Educate yourself on how the system works and how to test the various components in the system. Then invest in the necessary tools and equipment.
    3. Pay someone competent for an hour of their time and they should be able to tell you what is wrong after that.

    I think the third option is the cheapest, fastest and least hassle.


  • #6
    rs8
    Registered Users, Registered Users 2 Posts: 445 ✭✭rs8


    yes george the vane is what im on about do these give trouble?


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  • #7
    George Dalton
    Registered Users, Registered Users 2 Posts: 5,728 ✭✭✭George Dalton


    Yes sometimes they do. I would say about 1 in 4 that I see with boost issues turns out to be a VNT problem. The rest are vacuum lines, solenoid valves, MAP sensor, wiring problems etc etc.


  • #8
    Plug
    Registered Users, Registered Users 2 Posts: 9,248 ✭✭✭Plug


    The vanes can get stuck in these. When you rev it does the actuator move or can you see it? Also see is there a vacuum at the pipe going onto the actuator on the turbo when you rev it. If there is remove the turbo and dismantle it. See can you clean out the vanes of soot and PM.


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