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  1. #1
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    Intermittent Turbo Audi A4 2.0 FSI

    Hey all,

    I've only had the car since July and over the weekend I covered around 300 miles. (first proper long journey)
    I did two long 100 mile journeys. I noticed yesterday and today that the turbo will sometimes not kick in.
    It was quite quick before in the first and second gear (3rd to 5th rev) , but it doesn't always feel like a turbo now.

    I had my cambelt changed recently (6th August)
    when I went to the car the VAG specialist had the car plugged into the computer and he said that there was a problem with my AC and intermittent turbo - but at the time I had no problems. He then said it is probably because the sensors had been reset when they changed the cambelt, reran the rest (I think and no problems- he did this within minutes)
    This was 3 weeks ago.

    So the first question is what the VAG specialist said is that correct - can the sensors give a false positive?

    I had a read on this forum and see it is a common fault. I need one of those devices to read the fault codes.
    Should I be concerned with this? What could make the turbo intermittent?

    BTW 61K on the clock.

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  3. #2
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    Is there anything in the engine to stop someone from ripping the crap out of the engine and turbo?

    I found myself testing this 10 times today and maybe 4-5 times it had no power.

    I'm thinking perhaps because I was testing too hard, the turbo might have been disabled.

  4. #3
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    The car will go into limp mode when its not happy. This will limit boost hence it feels like the turbo has stopped working. This can be caused by a whole host of things such as fuelling or boost leak.

    Best thing to do is get it connected to vag com and check for any faults.

  5. #4
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    Quote Originally Posted by Chris Norman View Post
    The car will go into limp mode when its not happy. This will limit boost hence it feels like the turbo has stopped working. This can be caused by a whole host of things such as fuelling or boost leak.

    Best thing to do is get it connected to vag com and check for any faults.
    thanks

    when it goes into limp mode - will I notice anything on the dash? i.e How do I know it is limp mode?

  6. #5
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    of course loss of power

    maybe the engine got hot
    I could live with the car like this, but ought to get it checked out I might have bought a lemon

  7. #6
    bez101's Avatar
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    it will cut power so you dont **** it up
    hence limp home

  8. #7
    bez101's Avatar
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    Quote Originally Posted by psd99 View Post
    of course loss of power

    maybe the engine got hot
    I could live with the car like this, but ought to get it checked out I might have bought a lemon
    you could live with your car going in to limp loss of power ?
    get a mini

  9. #8
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    Well not dangerous to drive around like this so in that respect i would be ok

    But i fear that the loss of power will become greater, i see your point so i will get it checked out


    Will see how it drives in the next week though

  10. #9
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    Sorry for hijacking the thread. Do petrol cars go into limp mode.....I thought this only applied to diesels?

    Could someone confirm.

    Cheers
    A

  11. #10
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    I am Fairly sure that
    both diesel and petrol cars go into limp mode

  12. #11
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    Performance is okay now still fairly powerful

    Just felt laggish after the long journey oh well

    took it to the garage and there
    There was no fault or error from the VAG console
    i saw him running the test

  13. #12
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    Quote Originally Posted by psd99 View Post
    Performance is okay now still fairly powerful

    Just felt laggish after the long journey oh well

    took it to the garage and there
    There was no fault or error from the VAG console
    i saw him running the test
    Could be the diverter valve. If that was going then wouldn't show up as fault code and would feel like no boost.
    08 2.0 TFSI Quattro SE V2, Milltek RS4 system, RS4 ARB, AMD Stage 1 remap, Xenons, Valcona leather, RNSE, Eibach Pro Springs, Bose.

  14. #13
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    Quote Originally Posted by northernlight View Post
    Could be the diverter valve. If that was going then wouldn't show up as fault code and would feel like no boost.
    Agreed, if it feels more like 150-160bhp than 200, then it's probably the diverter valve. I had this when I bought my TFSI last year. No fault codes or engine light, but it felt no faster than my previous car (Alfa 156 JTS) when I first got it.

    £50 for a new DV from ebay, and the difference was unbelievable.
    Audi A4 (B7) 2.0T FSI SE Quattro


  15. #14
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    Thanks guys so how do u diagnose that the valve is a problem?
    dont really know how to fit that valve

    Any guides? Not really engine competent

  16. #15
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    For the sake of £50 for the part, I just took a punt and risked it. It was immediately obvious after the new one was fitted that the old DV was knackered - the rubber membrane splits and leaks boost pressure.

    I didn't fit it myself as I'm pretty useless with cars (computers are more my thing), so just got a local mechanic to fit it. From memory it was only an hour's labour or less.

    P.S. AFAIK, the only way to diagnose it would be to remove the existing DV and inspect it for tears in the membrane, if you don't want to risk the £50 on a new part first. The new part should be a revision D, which has apparently been redesigned to be more durable.
    Audi A4 (B7) 2.0T FSI SE Quattro


  17. #16
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    I just dug up my old thread on this subject. TFSI Quattro performance?

    The part number for the DV, if you do decide to buy one, is 06H-145-710-D.
    Audi A4 (B7) 2.0T FSI SE Quattro


  18. #17
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    Hey part isnt easy to find

    I seen this though

    #C114 Audi A4 A5 TT Q5 VW Passat Turbo Cut Off Valve 06F145710G 06H145710D | eBay

    That might be a g and not a d

    Where can i get the right part from?

  19. #18
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    Atuslly this might do GENUINE SKODA AUDI SEAT DIVERTER VALVE 06H145710D | eBay

    The car is an audi 2.0 tfsi 162kw a4

  20. #19
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    I seen some videos of how to change the valve
    looks doable here

  21. #20
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    Just really hard to get to

    Underneath the engine

    Check out this video on YouTube:

    HOW TO REPLACE VW AUDI DIVERTER VALVE - VAG DIVERTER VALVE DIY 2.0T - 2.0T DIVERTER VALVE DIY - YouTube

  22. #21
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    Re: Intermittent Turbo Audi A4 2.0 FSI

    Got one sat in the boot of my car, need to get round to fitting it really...
    07 2.0T SLine SE V2 Quattro, Full Milltek with hi-flow sports cat, APR Stage 2+ 280BHP/325lb/ft, APR HPFP, K&N panel, S4 alloys, Spacers, Black Optics, Eibachs, RS4 grill and fogs, Fog tints, RS4 ARB, RS4 Gearstick, LCR splitter, Black Calipers, Drilled discs, Debadged, Colour DIS, Bose, Adaptive Xenons/DRL, Black/Silver Audi Exclusive leather, Audi Carbon inlays, carbon difuser/B pillars, RNS-E+/Bluetooth, Cruise, Int/ext light packs, Rain/light sensors, mudflaps, LED plate/side/boot/interior

  23. #22
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    Are u competent enough to fit it yourself?
    Fancy doing mine too please. Lol

  24. #23
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    If its not your Dv try your N75 boost control valve as mine failed and gave similar symptoms.

    Both valves can be bought from Audi Dv around £60 the N75 around £20

  25. #24
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    Thanks if there was a problem with. 75would the n75
    produce an error code?

  26. #25
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    Yeah mine would sometimes throw a code to say the boost limit was not reached.

  27. #26
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    What you need to do is check the Rosstech VCDS user map on here (if you are in the South i can assist) and offer someone a few beer tokens and they will scan your car and reveal specific fault codes eg faulty N75 / run a boost test. That's the 1st place to start.

  28. #27
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    Thanks already did that please read above


    Wl get the dv changed
    im excited lOl

  29. #28
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    Quote Originally Posted by psd99 View Post
    Thanks already did that please read above
    You make a vague reference to it yes, but from the code the computer provides, reference material on the web will point you to precisely what components to check 1st.

    Eg im not suggesting this is your code but to get an idea of what i mean:

    17964/P1556/005462 - Ross-Tech Wiki

  30. #29
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    Thanks guys

    The valve has arrived but not fitted yet

    Seen a video on utube but the valve is in an awkward place to get to underneath the car

    So How much should it cost to replace the valve?

    Btw does the valve always work when i use the right foot or will it only kick in certain times?
    reason I say it because initially I always feel a kick and power but after engine been running for a while
    the power feel is different more gradual and missing the kick feel

 

 

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