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what does this do?

olds_kool Aug 14, 2008

  1. olds_kool

    olds_kool Active Member VCDS Map User

    trying to figure out an intermittant starting problem and poor performance on my 2.5 tdi and came accross this

    it seems to be a vacuum operated choke between intercooler and inlet manifold, vacuum pipe connects to something under power steering resevoir cover, replaced vacuum hose as it had a split, but it never seems to operate, thought it might be a cold start choke so attached vacuum gauge before starting from cold but nothing there

    anyone got any idea what its for? do diesels need a choke for cold starts? first diesel ive owned so still learning !
  2. me8cat

    me8cat New Member

    This vaccum unit works intake manifold flap which only works when switching OFF
    engine. Operates flap which cuts off air to engine so engine stops smoothly. Opens again 2-3 seconds after engine has stopped.

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