I have been looking for a while at several W123 diesels, and test driven quite a few. Today I looked at a car that seems in quite good condition in most respects, checked all the "normal" issue spots. Drive-train seems in general good condition with very little engine blow-by. No smoke on start-up and smooth idle. Great body and interior. The one thing that stands out seems to be a lack of power coming off idle (this is in comparison to the other OM617 turbos that I have driven). There seems to be almost no torque until about 1500 rpm, at which time the engine responds normally. It does not matter if accelerator is all the way down, no black smoke or power.... At these rpm's, the turbo should not have any effect, so I think I can rule that out. Any thoughts on what could be going on? Seems that there is insufficient fuel delivery for some reason. Thanks for any comments