I have a 82 Euro 240D. On top of the valve cover is a three way "changeover" valve, which, I think, is leaking. Thankfully, I was able to locate a vacuum diagram that is really close to what I have.

So, here is my question. On this picture, if I apply vacuum (or suck) from 2, while blocking 1 and 3, it does not maintain vacuum. I think it should. The car does not shut off, however, if I disconnect the line at [2] and block it, it shuts right off.



[1] and [2] go to a valve on the IP which is called the "vacuum control valve"
[3] goes to transmission

is the changeover valve bad?

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'82 300D (project)
'46 Willys (project)
"Nothing seems to be the way it should in this garage." -jt20
"Smarter than an engine, dumber than a hoodlatch..." -jt20
"Start jumping up and down to smoosh down those engine mounts" -DeliveryValve
"no" -kerry
"At this rate, you may have it done by winter" -layback40

I think this is the closest diagram that I could find that matches my 240D Euro

Attached Thumbnails

 

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'82 300D (project)
'46 Willys (project)
"Nothing seems to be the way it should in this garage." -jt20
"Smarter than an engine, dumber than a hoodlatch..." -jt20
"Start jumping up and down to smoosh down those engine mounts" -DeliveryValve
"no" -kerry
"At this rate, you may have it done by winter" -layback40

#3 goes to trans, correct? There is always a vacuum supply to the trans until full throttle (just about)

suck on #1, actuate the valve, determine if / when #1 closes

do the same for #2

I think only one of them should close completely under full throttle

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