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what does this do?

olds_kool Aug 14, 2008

  1. olds_kool

    olds_kool Active Member VCDS Map User

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    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

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    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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