It depends on the tranmsission, the 722.xxx have a vac modulator, the eariler ones on the diesels do not, they have an acelerator linkage operated lever instead.

If the tranny has a vac modulator, there will be a vac valve on the IP or on the valve cover, depending on model. Some also control the EGR, but that will only be on about 83 or later engines, earlier ones don't have an EGR.

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!