I have been having a strange problem with my 2001 s3 (facelift amk 210) on cold mornings first thing I have no boost what so ever. This has stuck through 50 mile journeys so its not a warming up issue. Also more recently I have noticed that this only happens on the first startup of a cold morning. IE if i start the engine and turn it off and start it again it is fine.
Anyone ever have anything similar or know of what i could check to fix this?