Latey I,ve been hearing a tic-tic sound from my 93 940T,it has 156000 on it. After looking around and smelling exhaust,I founded an exhaust leak @#*$ I said.I was thinking exhaust manifold gasket on an turbo engine @#*$$$,So after about week of tic-tic-tic,I said check the monifold bolts 1 I got an 1/2 turn 2/3 tigh 4 1/2 turn.The header pipe behind the turbo,was loose after tighing these 3 bolts.No more tic-tic sound,he,he he.Outofworkjoe is now an happy man now.