Some later 603's have the GP run for a bit (no more than 60 seconds) after the starter is operated, don't know about the 602.

Basically, the engine runs exactly as it does at temp except that boost may be limited (these have electronic boost control). Other than that, normal operation.

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!