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1.9 TDi Turbo didn't come 'on' this morning...

Discussion in 'A4/S4 forum(B5 Chassis)' started by impster, Jul 27, 2009.

  1. impster
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    impster Member

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    [Jul 27, 2009]
    On the way to work this morning, I noticed I was really down on power - no turbo whatsoever!.

    I called my Dad (who has a 1.9TDi Avant) and he said that he occasionally had the same problem, which was usually sorted by switching off the engine and restarting.

    I did the same, and the problem seems to have cleared.

    Is this a common occurance, and what (if anything) can be done to rectify what I see as a potential future problem of the same sort?

    Many many thanks once again in anticipation.

    Impster
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  3. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Jul 27, 2009]
    vagcom scan will tell you what was going on, but i suspect the vanes in the VNT turbo sticking.
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  4. impster
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    impster Member

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    [Jul 27, 2009]
    Thanks for that reply - but what does that mean? Is it a diy job or an expensive replacement part?

    BTW the engine is a 115hp engine - not a 90 or 110 (if that makes a diference).

    Thanks again.
    Last edited: Jul 27, 2009
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  5. dieselfitter251
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    dieselfitter251 Blow ma own trumpet?

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    [Jul 27, 2009]
    Hmmm. I had a problem like that. VAGCOM did help to sort it out, in my case it was the vaccuum sensor on the return feed from the IC. I also had some perished vaccuuum lines, I'd post a picture but I think the layout is slightly different in the 115PD engine.

    http://www.audi-sport.net/vb/showthread.php?t=66731

    This is the link to my problem a while back.
    Last edited: Jul 27, 2009
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  6. impster
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    impster Member

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    [Jul 27, 2009]
    Many thanks for that.

    Through some research I've theoretically narrowed it to:

    Sticky rod on the actuator for the vanes
    The turbo pressure sensor
    Perished pipe?

    Or, sod's law, a mixture of the three.

    Thanks once more.
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  7. impster
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    impster Member

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    [Jul 27, 2009]
    Ok, just popped home for lunch, took the engine cover off, and had a bit of a feel and a play with the actuator arm (just above the turbo charger, the rod that goes from there into a 'valve' looking bit. The arm was a bit 'sticky', but a few gentle pulls and pushes got it moving a good half inch or so, with no stickiness.

    Starter her up and heard the turbo spinning - just as it should.

    I think (touch wood, cross fingers etc) that it seems to have rectified any problems I had. Let's hope so.

    Impster
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  8. dieselfitter251
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    dieselfitter251 Blow ma own trumpet?

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    [Jul 27, 2009]
    Yup. Best bet is still to get in plugged into a vagcom. Should properly diagnose the fault.
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  9. impster
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    impster Member

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    [Jul 27, 2009]
    Ok, been doing some more digging.

    The actuator rod seems to be ok. By turning the ignition on and off, I can clearly see it move the requisite 3/4 inch up and down. Therefore I'm happy that it's not 'sticking'. What I don't know is if that the movement (by ignition switch) is via an electrical movement or by a forced vacuum - if it's controlled only by vacuum (i.e. one generated by turning the ignition on and off) then I'm pretty sure the fault lies elsewhere.

    Just went for a drive earlier, and whilst the turbo is working, one thing I noticed was that until fully warmed up, when I blipped the throttle, the revs seemed to stay high for a second before dropping off.

    On arrival back home about 30 minutes later, that symptom had gone.

    Does the above help any of you guys to come to a diagnosis? I'll be taking the car to a former independant Audi/VAG specialist tomorrow for a diagnosis too.

    Typical. Wife is due to give birth this week and the car's playing up. :shrug:
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  10. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Jul 27, 2009]
    I'm sure the ECU will have logged a fault code yestarday when it was dead, a diag scan will pull this out.
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  11. impster
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    impster Member

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    [Jul 28, 2009]
    Ok, got the fault code - it's 17695 / P1557 / 005463
    Charge Pressure Control: Positive Deviation - Limit Exceeded.

    So could be pipes, solenoid or the variable vanes (which seem fine to me).

    Impster
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  12. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Jul 28, 2009]
    Basically means you overboosted.

    If the vanes stick the turbo cant properly control its boost level and the turbo will overspeed, like it seems to have done there.

    Similarly if the solenoid failed it wouldnt send the correct pressure to the actuator.

    No idea if theres an easy way to check the vanes, perhaps just give the car a good arse kicking to see if you can blow all the **** out of the exhaust?
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  13. impster
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    impster Member

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    [Jul 28, 2009]
    The actuator rod for the vanes on the turbo has been fiddled with by me yesterday - at first it felt as if there was 'grittiness'/stickiness - I'm hopefuly presuming this was carbon build up in the unit itself. Some 'easing' by me on the actuator rod has got rid of this stickyness and the rod can now move up and down stiffly but smoothly.

    Maybe this was enough to bring 'limp mode' online, and enough to store the code.

    Hopefully this has cured part of the problem. I intend now to get my average mpg below 50 (I've been driving like a grandad to keep my average mpg over 55 which probably hasn't done any good) for a while. It will also help the revcounter needle get properly 'lubricated' over 4K rpm...

    I'll keep an eye on it for a while.
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  14. dieselfitter251
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    dieselfitter251 Blow ma own trumpet?

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    [Jul 28, 2009]
    good luck.... beware the turbo drop off! It still gives me a bit of an oh sh!t, better change gear when I'm not consentrating ;O)
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  15. impster
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    impster Member

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    [Jul 28, 2009]
    'Turbo drop off'!

    Yup, been embarrassed by that one soon after I bought the car!

    That Corsa driver must still be giggling on that one!...
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