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What is this bit on my a4 b5 1.8QTS

Snow Jun 1, 2009

  1. Snow

    Snow New Member

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    Hey all :arco:
    So I have my lovely A4 QTS.
    I did the timing belt myself on Saturday, the only proplems to report were:
    snapped bolt on the headlight (came off in my hand guv)
    and...the reason im writing this...snapped noggin on the watsit:wtf:
    There is a small thin flexible pipe that goes from the top of the engine )(turbo related I think), accross the engine and down to this round plastic junction in the fat hose beneath the right headlight.

    I need to know what this 'thing' is in order to order one, also if any harm will come from driving the car untill this is sorted.
    [​IMG]

    Jay
     
  2. aragorn

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

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    can you get a pic? Its either boost or vacuum related or perhaps an oil breather. I wouldnt want to drive the car until you get it fixed though without knowing exactly what it is.
     
  3. Snow

    Snow New Member

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  4. Broken Byzan

    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User quattro Audi A4

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    Sounds like the DV pipe, and as long as you not boosting like crazy it will be ok short term Just go for a 710N
     
  5. aragorn

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

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    compressor stall on a K03 is not going to go down well, so if you do drive it, be VERY gentle with it until you replace the pipe
     
  6. jcb

    jcb Active Member

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    its a vaccum signal pipe come off the bottom of the inlet manifold.
    get your camera phone and take a pic from under neath, bet there is a skinny pipe with nothing on it
     
  7. Snow

    Snow New Member

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    Finally...this is the bit, cut off valve according to Audi...Although he did just have a good guess. I’ve sent him the pic too for identification.

    http://cid-d7f5a68e6326c3f9.skydrive.live.com/self.aspx/just%20random%20sum%20pic%7C4s/a4b5%201.jpg

    Can I replace this with an aftermarket part for better performance or am I better off sticking with the Audi part?

    what does this do and will it damage my engine...I’ve been VERY very gentle with it today...boring but with the bonus of 35 - 40mpg
    Still..rather the fast than the economical

    Jay
     
  8. Broken Byzan

    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User quattro Audi A4

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    Yep thats your diverter valve, get a TT one AKA 710N, its upgrade, and a shade over £20
     
  9. Snow

    Snow New Member

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    Nice one Mark.
    I assume I can grab one of those TT diverter valve 710N at the stealer. Any other trick parts I can replace while im at it?
    Ta
    Jay
     
  10. aragorn

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

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    Yep, main dealer part, just ask for a diverter/dump valve for a 225bhp TT.

    The part number is:
    06A145710N
    cut-off valve
     
  11. docurley

    docurley Moderator Staff Member Moderator

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    You can replace the N75 valve with a N75J valve while your at it.
     

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