2.0 tdi 140 rough idle EGR valve throttle body
Been having serious rough idle issues with my A3 and also a 'lack of boost' - starts to boost then stops then carries on a few seconds later.
Anyways - after reading plenty of threads I decided to take off the EGR valve and give that a thorough clean - wouldn't believe how much soot came out!! I did the same with the throttle body while I was there and also the hose directly under the throttle body.
When starting up it puffed out a lot of black smoke when revving hard - guessing this is a load of soot that's been dislodged?
Upon taking her for a drive - the boost issue is still there (it may have improved SLIGHTLY - only saying 'may' as I could be just expecting it to have? if this makes sense. Also the rough idle has not improved one bit - it idles at about 820rpm - very juddery on idle - rev counter does not move at all.
Any one got any ideas what this could be? Driving me mad..! :)