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Brian, I will try your experiment with the Mityvac on the transmission vacuum line this morning and report later today.
Sam, I have attached a vacuum diagram that is the closest fit to my 1987 300D-T (W124, OM603) that I have been able to find in the FSM CD-ROM.
The purpose of the vacuum amplifier (inferring from the name) is to provide a wider range of vacuum changeability than what would otherwise be available from the VCV. How the vacuum amplifier works to do that I have not yet figured out.
You will see a vacuum reservoir in the right fender. I have not confirmed the actual presence in my car of this reservoir but the thick line to it is definitely present. It would be the reason why there is vacuum on the transmission line even after the engine is stopped.
I'm unsure whether there are vacuum orifices in the lines at the tee located directly above switchover valve Y29.
I will be the first to admit that I don't understand how this rat's nest does what it is supposed to do.
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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