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Anyone know what this pipe does?

Discussion in 'A4/S4 forum(B5 Chassis)' started by mac1403, Aug 16, 2006.

  1. mac1403

    mac1403 Member

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  3. dummi

    dummi smoking a6

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    you need a bigger picture of the whole area.
     
  4. mac1403

    mac1403 Member

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  5. dummi

    dummi smoking a6

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    looks like part of the crankcase and fuel vapour recycling system.. if that is the case fuel vapour could be escaping into the engine bay so potentially explosive and you would not notice any difference to performance it is there for your safety. whatever it actually is it is best to replace a noticed split hose and you will be reassured nothing goes wrong from it.
     
  6. Broken Byzan

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

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    It will probably be sucking air through that from the crankcase ventilation system TBH, causing poor idle, slow pickup and maybe slower thamn normal to return to tick over after reving
     

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