My car strugles to start when its been stood for a while when cold. It starts after a little longer wind and misses a couple of seconds then a plume of white/blue smoke comes out the back that stinks of diesel. The timing belt has been changed and torsion value is 0 and idle consumtion is 0.4 l/h - 0.6l/h! After doing a diesel purge i went thru the revs and went back to check on the purge and it was black. Before doing the purge i replaced my fuel filter that had only coverd a couple of thousand miles and it was black with small black filings in the bottom of the housing. Could this be my tandem pump? Injector readings seem to be in spec.