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How do you test the DV?

Discussion in 'A3/S3 Forum (8L Chassis)' started by mark_sarah, May 30, 2010.

  1. mark_sarah

    mark_sarah Limp mode!

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    I have an irratic boost, and wondered if it was my standard DV on its way out!

    How can you test if its faulty, i have read a few links but still un-sure.
     
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  3. OllieH

    OllieH Member

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    Remove it from the car, push your finger up the bottom port, pushing the diaphragm up against the spring pressure, then put your palm over the side port of it creating a seal and release your finger on the diaphragm. The diaphragm should stay up against the spring pressure until you release the seal on the side port. If not then your DV is passing.
     
  4. finesse

    finesse Active Member
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    Low Boost – Limp Mode, MBC, BOV, DV, Boost Leak, N75,
    High Boost – MBC Setting, N75, Spark Plugs, Ignition Coils
     
  5. mark_sarah

    mark_sarah Limp mode!

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    Cheers. will try that tomorrow.
     
  6. S3 Nattie

    S3 Nattie Quattro ist für sissies

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    Shouldnt you put your fingers over the vacuum hole on the top, not the side port.
     
  7. OllieH

    OllieH Member

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    Yep, think you're right. My bad :blush:
     
  8. mark_sarah

    mark_sarah Limp mode!

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    I Remove it from my car today, pushed my finger up the bottom port, pushing the diaphragm up against the spring pressure, then put my palm over the side port of it creating a seal and released my finger from the diaphragm. The diaphragm just released, i also tried the top but that also just released.

    Does this mean my DV is knacked?
     
  9. sportquattro

    sportquattro Active Member

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    Sounds like it, time for a Forge 007p methinks, better design, but costs about £70, as oppposed to about £20 or so for a standard Bosch DV
     
    #8 sportquattro, May 31, 2010
    Last edited: May 31, 2010
  10. OllieH

    OllieH Member

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    My bad for saying the side port, it was the small nipple on top that the 4mm pipe attaches to, but if that didn't work either then your DV isn't working and you need to replace it. Standard Bosch is ok if the car is standard and you plan to keep it that way, if not I would go with the Forge 007P.
     
  11. Matt82

    Matt82 Active Member

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    pull it off. blow down both ends, and the vac hose. should all be air tight
     
  12. mark_sarah

    mark_sarah Limp mode!

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    If i blow through the side pipe air comes easily through the top vacuum pipe. If i blow through the top vacuum pipe, air easily passes through the side hole.

    If i blow through the bottom pipe, air will not pass through.

    Can anyone tell me if this is the correct function?
     
  13. Matt82

    Matt82 Active Member

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    is code F

    bottom part should be air tight. vac line should be air tight. side should be air tight unless vac is applied to the vac pipe

    time for a new DV, get on the blower to audi or vw
     
  14. S3 Nattie

    S3 Nattie Quattro ist für sissies

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    Testing DV is simple and has been said already.

    Push the diaphragm up with a finger or pen to compress the spring, then place you finger over the top nipple (vacuum) then release your finger or pen from under the diaphragm and it should stay in position (compressing the spring)

    If it goes down then diaphragm is split and you need a new one

    Nathan
     
  15. Matt82

    Matt82 Active Member

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    that would test the diaphragm, but there is also a seal in the plunger too. ive got a spare at home, i might dissect it
     
  16. mark_sarah

    mark_sarah Limp mode!

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    Replaced my DV with a Forge 007p today. Definately worth every penny.
     
  17. 1animal1

    1animal1 The Clar!! it mouves!!!
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    slight improvement but still over priced if you ask me :/
     

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