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 !