Leaking pressure valve holder copper seal on one or more elements.

Take it back and have them re-torque the pressure valve holders (i.e. repeat the job and do it right this time).

Timing is not an issue, it's not touched when replacing a pressure valve holder o-ring.

Your good milage is a result of not injecting as much fuel in one or two cylinders as in the others -- causes rough idle and sometimes rather nasty injector knock.

We replaced them on my brother's SDL last week hoping to cure a rough idle. It helped, but I think it's really injector nozzle time.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!