Can any body point in the right direction with a prob I have with my 03 318i N42 please? It's very under powered under two thousand revs and not particularly great after that. a slight erratic tick over and a rattle when started up from cold, some times worse than a previous cold start up. Ive been told by ex BMW mechanics that is just how it is with these engines are but I can't believe that they leave the factory like this. It's had quite a bit of work done to it by ex BMW mechanics, new cam chain, tensioner and guides, vanos solenoids, CCV valve, the lot besides cam sensors co could the cam sensors be at fault? There are on lights on the dash broad or fault codes present. Help please, ta Daragh.