I've been having some vacuum related transmission issues for a long time. I start off in 2nd gear and can't kickdown unless I manually move the lever. That's fine, I'll deal with that later.

But, I'm in 4th gear by 25 mph -- my car never has a chance to get into its power band and get moving, and the 63 horses in my '83 240D need all the help they can get.

I dug out a vacuum diagram and looked at the connections. I've removed and plugged the single line going from the top of the valve cover to the EGR hardware, but it looks like the previous owner did something screwy, because I'm missing an entire "T" connector and an "oriface" of some sort.

I put my MityVac on a "T" between the valve cover and the transmission modulator and it registered 25 in.Hg. at idle. ForcedInduction has mentioned it should be closer to 8-10 inHg. I didn't even bother to check the VCV operation.

Does anyone know what part #s for orifaces are supposed to be? I'm about to go crazy about this.

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1983 Mercedes-Benz 240D
Automatic, A/C, Power Sunroof, Power Right Side Mirror
231K Miles FOR SALE MAKE OFFER

Replace the green vacuum valve.

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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg

• Vacuum system orifices
Color: I.D. P/N:
Yellow 2.0 mm 1162760929
Red 1.1 mm 1162761029
Blue 1.0 mm 1162761129
White 0.8 mm 1162761229
Green 0.7 mm 1162761329
Brown 0.9mm 1162761429

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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

Thanks, that's what I was looking for.

I almost want to do a 4sp conversion just to save myself the trouble.

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1983 Mercedes-Benz 240D
Automatic, A/C, Power Sunroof, Power Right Side Mirror
231K Miles FOR SALE MAKE OFFER

LOL...because that's SO much easier than replacing a couple of vacuum components... :p

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles

If there are orifices missing you could have vacuum surplus in the wrong places.

They restrict flow and help direct vacuum to required areas.

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