Speaking in general terms, three things that cause smoke on diesels are inadequate boost pressure, inadequate air flow and poor fuel atomization at injection.

If the boost pressure is sensed after the intercooler, I would rule out poor boost/flow since it's reading what I would consider proper stock levels. If the boost sensor is before the IC, there may be a restriction that's choking the flow into the engine.

Finally, I would look at injection pressure and make sure it's up where it should be. Not sure of numbers here, I don't have a spec on it but I'm reasonably certain it's north of 21,000 psi. If it's low, there may be a malfunctioning IPR on the pump that's bleeding too much pressure off or the pump may be worn out.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250