Compression Ignition Addict
Join Date: Dec 2007
Thanked 262 Times in 253 Posts
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That tube, from the factory, is normally connected to the intake where the black plastic block is between the air filter and the turbo hoses.
It is also the site if the "CCV Mod" which diverts crankcase blow-by either into a drip can (and into the atmosphere) or, more properly, back into the intake (otherwise you're removing a pollution control device).
Either way, yes it "puffs" vapor & Crank Case Ventilation (CCV) when running....