Learned a good one today about my LDS-465-A1. Ever since I bought this truck it has idled rough and smoked excessively, even at idle. Attempting to adjust the fuel pump did not help. Last night a friend found the manifold flame heater dripping diesel on the hot side of my turbo. Since then I have terminated both the feed and return fuel lines as well as blocked off the high pressure feed line to the fuel aspirator in the intake manifold. Suprise suprise.....no more excessive smoke or rough idling. The manifold flame heater was leaking raw diesel into my intake manifold. With no boost it was draining back into my turbo. When running it was going into the cylinders as a liquid, thus creating a knocking sound. So what sounded like a death rattle turned out to be a minor fix........