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  1. #1
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    2.0t fsi complete boost loss

    Hi fellas.
    Wondered if you can help me agin.
    Driving to work this morning in the torrential rain and I lost all boost pressure. Tried turning engine off and on again to reset, but nothing.
    Plugged in my phone to use the Torque app that i have, checked for faults , and nothing. Nothing on the dash either. Still the same on the homeward journey to.
    I do get a small pressure reading through the Torque app, buts its just the standard pre readings you get just before the turbo spools up.
    The DV has already been changed for the upgradded version, and I have tried the oil cap removal while engine running test, but no real issues there.
    Does anyone have any idea.
    Thanks

    Brad.

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  3. #2
    bez101's Avatar
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    id check the Dv
    boost pipe
    ic pipes

  4. #3
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    If the pipes or pipe have come loose, would I hear any hissing sounds.

  5. #4
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    As above, check IC/boost piping.

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  6. #5
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    Trust it to happen when we have just changed the clocks.
    Thanks fellas, i will check them on friday afternoon.
    Brad.

  7. #6
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    Buy a boost gauge

  8. #7
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    Right, I have checked my pipes, and all seems ok. I even pulled the new DV out to check it over, but there's not a lot that can go wrong with them.

    What can I check for now. It's been a bit frustrating driving, knowing I have no power.


    On a separate matter. While I was under the car, I noticed red fluid under the passenger side engine mount. Does this mean it has failed, the car has been feeling a little rougher than usual lately.


    Thanks

    Brad.

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    I have read that the PCV valve is a weak point, could this be the problem.

  10. #9
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    Can someone point me to the right place for the boost piping. I have checked the ic pipes under the engine. But I am not sure which pipes are the boost one's.

  11. #10
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    Right, quick update.
    I have had another look and I have noticed that the long rod coming out of the back of the pressure unit is not connected to anything. Is this normal, it seems strange to have that long rod their with a threaded end and it not be connected to anything.
    Also, I removed the lower passenger side IC pipe to check for small splits, and when I did so about 50 to 70ml of oil poured out on my driveway, again, is this normal.
    Sorry for all the questions, but I just want to make sure I have covered everything before I give in and take it to a garage.

    Brad.

  12. #11
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    Quote Originally Posted by Roadrunner146 View Post
    Right, quick update.
    I have had another look and I have noticed that the long rod coming out of the back of the pressure unit is not connected to anything. Is this normal, it seems strange to have that long rod their with a threaded end and it not be connected to anything.
    .
    oil can be normal if never emptied, it settles at the lowest point.

    This rod, is it at the back of the turbo?

  13. #12
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    Yes. A pipe links the DV to the pressure unit.

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    AHA, that'll be it. It's supposed to be connected via the nuts to the arm which activates the wastgate. Without it, boost is just vented away

  15. #14
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    Its going to be fun connecting that back up. I can just about see the waste gate on the back of the manifold. Looks like I will be getting some grazed knuckles tomorrow. Does anyone know what the connection at the waste gate end looks like. Brad.

  16. #15
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    Does this picture help? The turbo bypass valve is removed in this shot. The wastegate vacuum unit is visible at the top with the actuator rod coming out of it going to the wastegate (bottom rhs) on the turbo.

    Audi A4 B7 2004 red 2.0 TFSI Quattro Sport saloon, Servotronic steering, MFSW, CDIS, DRL with Coming Home, auto dual xenon lights/wipers/mirrors, split folding rear seats, 3rd headrest, centre armrest, Isofix mounts, RS4 rear ARB, pedals & carbon dash trims; Audi TTS 9Jx18alloys (2 sets), Yokohama AD08 summer, Conti TS830P winter 245/40/18 tyres, TPI 15/20 spacers/lockers, Pipercross filter, GFB DV+ turbo valve, NGK BKR7EIX plugs, Osram Silverstar Xenarc D1S bulbs. Build thread

  17. #16
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    I can't quite make out the connection in that shot, but thanks Al.
    I have managed to find a linkage picture, but it's from a Golf, but it does give me an idea of what I'm looking for. HPIM1997wcomments.jpeg

  18. #17
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    Dont turn the rod itself or you will tear the rubber inside the actuator.


    Lynall

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    Quote Originally Posted by lynallbel View Post
    Dont turn the rod itself or you will tear the rubber inside the actuator.


    Lynall
    Thanks for the advice.

  20. #19
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    Hi all.
    I've managed to sort the problem out, but it was a lot more evolving than I originally thought.
    The waste gate actuation rod had actually snapped. So a bit of head scratching, I came up with a plan to repair it.
    While removing the N75 valve, if that's what it's called, I managed to snap a small plastic pipe off a small switch located next to it.
    So two repairs to do.

    Been for a drive and I have my boost back, but not quite the same.
    Boost comes in, but higher up the rev range and not quite as strong.
    According to the boost gauge, I'm getting 4.8psi which is not full boost.
    Am I right in thinking that the actuation rod is adjustable, if so, which is the correct way to adjust it, either clockwise or anticlockwise.

    Here's some pictures of the repairs I did. The bolt used to fix the rod is a worktop connecting bolt. Worked a treat. And dont panic over the amount of glue used to fix the snapped pipe. It was super glued first, then epoxy resin spread around to give it some strength. 20131103_133952.jpg20131103_152035.jpg

  21. #20
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    the length is critical as youve found out you wont get full boost otherwise.

    what a mare
    back to boost, oh how I missed thee....

  22. #21
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    What is the standard boost for a 2.0t fsi psi wise.
    I will need to know this before I alter the length of the bar. Don't want to over boost.

  23. #22
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    Quote Originally Posted by Roadrunner146 View Post
    What is the standard boost for a 2.0t fsi psi wise.
    I will need to know this before I alter the length of the bar. Don't want to over boost.
    12-13 psi, 2800 rpm is when you make peak boost or around there.

  24. #23
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    Thanks.

  25. #24
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    There is some information here that may help.

    Looks tricky to get the right adjustment / length. Good luck!
    B7 A4 Avant S-line Special Edition v2 2.0 TFSi - AmD stage 1 - 263Bhp 396Nm

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    Thanks for that.
    I have read a few threads on the subject. But because of the unique way my actuation rod broke and how it's been repaired, it should be a simpler job.

  27. #26
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    Well I managed to get under the car this morning, and what a PITA. 2 and half hours it took me.
    When fitting the worktop bolt the first time, it must of wound in what was left of the actuation rod back into the adjuster, making the rod to short. I nearly lost the thread completely.
    The only way I could think of to stop the thread rotating was to file down another bolt to lock the thread to adjuster, and it worked a treat.
    While driving I am hitting peak boost at 14 psi, but normal acceleration, I am getting 7 to 9psi. I could tweak a bit further, but I am happy with what I have got. Not bad fix for £5 for bolt and super glue.

    Thanks for all your help and advice fellas.

    Brad.20131108_125431.jpgScreenshot_2013-11-08-13-31-35.jpg

 

 

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