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Off boost flutter

Discussion in 'A3/S3 Forum (8L Chassis)' started by ads1377, Aug 23, 2012.

  1. ads1377
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    ads1377 Member

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    [Aug 23, 2012]
    When I'm coming off the boost, i.e lifting off or changing gear, I'm getting a flutter noise instead of the crisp psst it used to do.

    I've swapped the dv and this made no difference.

    No obvious split pipes.

    Any ideas folks? (amk s3)
    #1
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  3. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Aug 23, 2012]
    Pipe going to the DV could be getting no vacuum... what DV you using? what did you swap it with to test? are you running an N249 bypass?

    <tuffty/>
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  4. Benjiman46
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    Benjiman46 R-Tech Terrorist

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    [Aug 23, 2012]
    Pull the pipe off the top of the DV, get a mate to gently rev the engine and stick your tongue on the end of the DV vacuum pipe, you should feel a strong sucking, it wont hurt... And calm down children ;) lol

    If you're getting vacuum, I'd give the DV a good old service to make sure it's not sticking, you could have swapped a broken one for a sticking one, it's a possibility...

    If that fails, then get a new length of silicone hose and run it directly from the inlet manifold to the top of the DV.

    As above, have you done N249 bypass? If not, that's worth doing and you'll be able to rule out your piping too...
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  5. ads1377
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    ads1377 Member

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    [Aug 23, 2012]
    Damn you bloody split hose under inlet manifold!!!!!!!!
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  6. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Aug 23, 2012]
    :)

    <tuffty/>
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  7. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    [Aug 23, 2012]
    if its rubber it rots (or splits)
    PCV, dv, fpr (scarily)
    #6
  8. ads1377
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    ads1377 Member

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  9. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Aug 23, 2012]
    Fuel Pressure Regulator

    <tuffty/>
    #8
  10. s3dave
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    s3dave TFSI Hybrid

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    [Aug 24, 2012]
    Also check the pipe going to the actuator from the n75 valve..
    #9

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