Date registered: Oct 2009
Vehicle: 1978 300D - sold, 91 300TE 4Matic - sold, 1982 300D
Location: Kalamazoo, Mi
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I would suspect skewed injection pump timing due to timing chain stretch if you have a high milage car that has an older timing chain. I'm not sure if 87's have an ALDA (like on the OM617), but the lines coming from it can become clogged and will limit boost. It results in loss of power and having to really put your foot down to get the car moving, especially from a standstill.
I had the timing chain stretch issue on my old 78 300D and after I adjusted the IP timing (and the valve clearance, your car has hydraulic lifters so it's not an issue) I was shocked at the improvement. A turbo diesel should have no problem passing at speed, they're just a little slow under 30mph...