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You need to measure vacuum at the VCV nipple on the blue UFO. The VCV drops the vacuum in the red line connected to it to atmospheric pressure. The switchover valve shown in the circuit is to bypass the VCV and apply full vacuum to the blue UFO during cold starts to help with the rough 1-2 shifting. It is SUPPOSED to drop out when the block heats up and allow the VCV to operate normally. If it is remaining energized, or is stuck, you can have full vacuum applied to the VCV nipple at all times.
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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)
Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)
Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]
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