Ive got the 2004 120 1.9cdti and im getting the dreaded WOOSH when accelerating / letting off the accelerator. Its really annoying me.

I know its related to the BOOST for the turbo etc. I know its probably something with a hole in it or not quite tight enough - what i dont know is where to look.

Pleaseeeee someone either give me a diagram or a good explanation of the particular pipes / components that i need to check so i can whip them off and have a look for spits / loose nuts etc.

FYI - revs and drives freely - no warning lights on over 3k - 400 to a tank generaly running around in town (Stuck caliper at the minute.)