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Interesting. Similar vintage Federal 300Ds have EGR. But they have turbos. Maybe that's the difference. I just don't have info on 201s or 601s.
What I would do until an appropriate vacuum diagram is available is add back VSV 127 and temp switch 128. See attachment without flapper. I don't know of the pressure control valve by default is in a favorable or unfavorable position. If it's in an unfavorable position by default, either wire it in the favorable position or add back the devices that operate the pressure control valve. See attachment with flapper.
Sixto
87 300D
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