Hi, new too this site, I have a 96 300 TDI ES Auto, in the last couple of weeks it has started a load, metallic banging / knocking noise on start up, last for 10 - 20 seconds, then gone, no more noises, drives fine pulls extremely well, no smoke no oil loss or over heating, stop start many times no more noise, leave to get cold and it does it again, but only from cold. sounds like its coming from around fuel dist pump area, disconnected ac pump, and removed fan belt... just cant pin point exactly where or what is causing this? any help would be extremely appreciated... Has anyone had some issues?