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Air box noise/chatter ?

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by Quattro180, Jan 3, 2011.

  1. Quattro180
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    Quattro180 Member

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    [Jan 3, 2011]
    I have recently been hearing a funny noise coming from the airbox/intake area? It sounds like a chatter or suction noise. It only does it when coming off the throttle. Car seems to be running ok but maybe using more fuel than usual? Any ideas?

    Cheers
    #1
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  3. quattro1
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    quattro1 Member

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    [Jan 3, 2011]
    your diverter valve is broken or the little vac pipe on it has split
    #2
  4. Quattro180
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    Quattro180 Member

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    [Jan 3, 2011]
    sorry to ask a stupid question but could you try and tell me exactly where the diverter valve and the little vac pipe is? i assume that it is attached to the air intake pipe?

    cheers
    #3
  5. Quattro180
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    Quattro180 Member

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    [Jan 9, 2011]
    [​IMG]

    Does this help?
    #4
  6. Az
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    Az Hard slammed!

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    [Jan 10, 2011]
    My car does exactly the same! The previous owner had my car remapped so I always assumed it was due to that, and I've had loads of work done on the car by audi/vw specialists who have taken the car for a test drive after they had carried out any work on it and they have never said anything about it, so I assumed everything was as it should be. But now it's got me wondering too as soon as the diverter valve and pipe have been mentioned. My car wistles and sucks a lot under acceleration too.
    #5
  7. Quattro180
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    Quattro180 Member

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    [Jan 10, 2011]
    It just doesn't sound right to me, unless anyone else knows different? The car seems to be using slighty more fuel aswell.
    #6
  8. Quattro180
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    Quattro180 Member

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    [Jan 12, 2011]
    I am taking the car to a garage on Saturday and will report back
    #7
  9. Az
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    Az Hard slammed!

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    [Jan 12, 2011]
    Good man!
    #8
  10. C17LJR
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    C17LJR Member VCDS Map User

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    [Jan 12, 2011]
    my mapped 180 does the same,

    sounds almost like a distant police siren when i accelerate?
    #9
  11. Az
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    Az Hard slammed!

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    [Jan 12, 2011]
    Haha! Yeah it does! I like it, and always get comments about it from mates and passengers, my step daughter calls it the jet car. :)
    #10
  12. Higgsy
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    Higgsy Hard To Spin

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    [Jan 12, 2011]
    on the 1.8T the diverter valve is at the bottom of the engine behind the offside foglight, should have 3 hoses coming out of it, not too sure about the 2.5 though, if its goosed or a hose has split, you should be able to see it from there.
    #11
  13. rawtor51
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    rawtor51 Active Member

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    [Nov 21, 2011]
    Anyone else get this , my 130 does it , i had it into Audi and they said not to worry about it
    #12
  14. marktdisport
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    marktdisport Active Member

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    [Nov 21, 2011]
    my standard 130 also does it......... just a noise of the turbo coming off full spool id say......
    #13
  15. simon.m
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    simon.m Active Member

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    [Nov 21, 2011]
    i have this sound too did not have it when i first got the car over two years back any one have a pic of a diverter valve and where it would be on tdi 1.9 so i can have a look ;-)
    #14
  16. rawtor51
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    rawtor51 Active Member

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    [Nov 21, 2011]
    I was really worried about it to start with but Audi assured me I shouldn't worry about it, thay said some do it and some don't, they wouldn't turn away custom surely if somthing was wrong, so since then I don't take any notice of the noise, I was just curious to see how many other folk had the same.
    #15
  17. Widemonkeys
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    Widemonkeys 1st Gear

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    [Nov 21, 2011]
    Mine used to do it all the time, now it's stopped but my car also constantly goes into limp mode
    #16
  18. tdia4
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    tdia4 TDIPOWARRR

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    [Nov 22, 2011]
    The tdi does not have a diverter valve.

    My tdi 130 does it as well, i've asked before and it seems many other people have it.
    #17
  19. pbwatch
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    pbwatch Member

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    [Nov 22, 2011]
    I suffer this too on my 2.5tdi 180 but I also get a louder air rush noise and a noisy turbo under load when it is playing up! I have been told by a Turbo specialst and that it could be a cat issue creating more back pressure and causinbg the egr valve to remain open and cause the chatter when I ease off the throttle!
    #18
  20. Turkster
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    Turkster Bro.Paul 2.5TDI Quattro Sport

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    [Nov 22, 2011]
    sticky actuator on the turbo,
    #19
  21. iyrix
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    iyrix Member

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    [Nov 22, 2011]
    Mine has done this since I had a major service. Not been too worried about it, but if it's something to fix I will.
    #20
  22. Turkster
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    Turkster Bro.Paul 2.5TDI Quattro Sport

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    [Nov 22, 2011]
    we had a thread on this one a while back, its a sticking actuator valve thing, i had this on my car, so i swapped my whole turbo unit over with actuator and the problem was GONE! ended up being the actuator,
    #21
  23. rawtor51
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    rawtor51 Active Member

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    [Nov 22, 2011]
    Ah sweet , gives me somthing to look at ,

    Thanks.
    #22
  24. iyrix
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    iyrix Member

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    [Nov 22, 2011]
    Yeah same, need to have a look t some point.
    #23
  25. jonny_mcc
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    jonny_mcc Member

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    [Jan 25, 2012]
    this just started happening on mine last night when i reversed it into my parking space. Does anyone know if the actuator can be swapped without changing the turbo?

    J
    #24

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