Deisel Purge had a much higher cetane rating than normal diesel fuel.

If the nailing stops with the Purge and returns immediately, time to get the injectors checked -- opening pressure or pattern may be bad, and you need new nozzles.

Otherwise, it's compression check time.

Check chain stretch and injection timing, too.

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!