Some of the Members have said a several things:

The Nailing goes away after 100s of miles of driving

In use Injector Pop Pressure gets lower; and, raising the Pop Pressure during rebuilding retards the time when the Fuel is actually being Injected.

(Nailing can be caused by too late/retarded of Fuel Injection Pump timing and also too much advanced timing.) It may be the Fuel Injection Pump needs to be retimed.

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84 300D, 82 Volvo 244Gl Diesel