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A4 2.0 TDI 2006 - Power Loss, stays mostly under 3000 RPM

dRu Jul 30, 2017

  1. dRu

    dRu Registered User

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    Hi everyone.

    I've been a forum reader for a while now, trying to get ideas to fix a problem I'm having with mine. I decided to expose my problem to see if I can get any other ideas, since I'm all out...
    By the way, I'm not a mechanic, so go easy on me. :)

    The problem - started last year in August, in higher RPM it would cut off, almost like if the turbo stopped working, then seconds in, it would kick back in. This problem developed consistently, to a point where it had no power to overtake, and struggle uphill. Now, it doesn't develop well, and its almost capped at 3k rpm. Needs extra acceleration to get going on 1st gear.

    It has no error codes!!! not one...ever!

    What has been done:
    Two different shops, many combined months of shop "stay-over"
    - Air Mass sensor replaced (AUDI one, even thought, I tried two others before - one bosh, one from china lol)
    - Turbo pressure checked (2BAR - deduct the atmosphere 1Bar.. )
    - Vacuum system has no leaks
    - EGR valve canceled
    - Injectors tested, they told me it passed the test, but later on the chief mechanic told me it was the injectors...??
    - No smoke coming out through the exhaust
    - I turn the car on, like a clock, everything sounds great.

    In sum, with everything that was done, the car is now worse...

    So, I'm at the brink of calling in a priest.

    Hopefully, someone here can push me in the right direction. I love this car and want to keep it.



    PS: I live on an island, there is no AUDI shop here... :(
    Also, they did a bypass here [see img] in the vacuum circuit (??) now the T is gone. Does anyone know what this is for?

    Thanks in advance!
    dRu
     

    Attached Files:

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  3. TonyMoneo

    TonyMoneo Registered User

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    Do you have vcds?


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  4. dRu

    dRu Registered User

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    No, I do not. :(
    I can get to someone who has one, I'm sure
     
  5. TonyMoneo

    TonyMoneo Registered User

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    I had an interesting issue with mine, the temp sonsor at the turbo got busted and it did not throw out an error. Our symptoms dont sound exactly similar, but maybe have a look at temps during startup. My egt was 400 degC at startup (which is nonsense). Will be an easy fix if thats your prob as well.


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  6. carlcall

    carlcall Well-Known Member VCDS Map User

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    Have you had your turbo checked as I had a similar problem and I took the inlet pipe off the turbo and video'd it when it was cold as once it had warmed up it would run fine to a certain point and then all of a sudden there would be nothing but black smoke and no boost.

    Here's a video of mine.....

     
  7. dRu

    dRu Registered User

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    Interesting, but the turbo has been checked and it's working fine. It was my first thought when the problem started, it felt like the turbo would stop working as she would lose power.
    But I'll have another look, and use your video as reference.

    Thanks bud




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  8. Cadman

    Cadman Registered User

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    Have you changed the fuel filter as I had a similar issue with the car not revving past 3000rpm. Turned out the fuel filter was blocked cause fuel starvation at higher revs


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  9. dRu

    dRu Registered User

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    Yup, it was replaced a few weeks ago :(



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  10. dRu

    dRu Registered User

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    Can an old battery be the culprit?
     
  11. LawrenceH

    LawrenceH Registered User

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    It sounds like a boost leak to me, have you thoroughly checked all the intake pipes, joints and IC?
     
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  13. way2204

    way2204 New Member

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    did you ever fix the problem i have exactly the same issues and could do with help
     
  14. Pie-eyedpiper

    Pie-eyedpiper Registered User

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    TDI? 1.9 or 2.0?
    Sounds like your turbo vanes are clogged or egr valve is faulty throwing it into limp mode above 3000 rpm.
     
  15. way2204

    way2204 New Member

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    Egr removed and deleted and no cat just put a new turbo on no revs same as before turbo fitted. Could it be intake manifold
     
  16. way2204

    way2204 New Member

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    2.0tdi 16v brd engine
     
  17. Pie-eyedpiper

    Pie-eyedpiper Registered User

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    Swirl flaps sticking in your intake manifold maybe.
     
  18. AlpineCab

    AlpineCab Registered User

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    Cam sensors / adjusters?
     
  19. way2204

    way2204 New Member

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    Cleaned throttle body changed swirl flaps manifold. Still no power 1st and second and hesitates to rev really baffled now
     
  20. way2204

    way2204 New Member

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    Will try cam sensor what adjusters ?

    And thanks for all help at my wits end
     
  21. AlpineCab

    AlpineCab Registered User

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    If you have variable timing on the TDI then there will be cam adjusters triggered by oil pressure fed actuators which change the cam position accordingly. The actuators are easy to change (on petrol engines at least, not sure about diesel).
     
  22. way2204

    way2204 New Member

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    Going to change cam sensor and cam belt water pump needs doing as well hope that works if not i will look into adjusters. Thanks for input i will let you know how i get on
     

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