Ok the weirdest thing of it all is my friend caled me at 3.25 am to tell me her 1984 wagon wont shut off,i said to her i didnt know how to fix that,but then today,my 85 w123 is doing the same thing,neither car will shut off,she has a w123 american
and mine is a euro 85 with that more modern looking IP nad vacumm.
help,a diy troubleshoot??

Do a search for "vacuum leak" or "shut off valve"

http://dieselgiant.com/repairyourshutoffvalve.htm

http://dieselgiant.com/mercedesvacuumtroubleshooting.htm

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Sonny


86 190D N/A 2.5L Auto 265k "Ruby" -Sold-
79 300D 242k "Condi" my first -sold- RIP
2013 chevy sonic hatchback - had to for work

That's what it's for....

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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

heh....Mine won't shut off with the doors locked. I suspect evils spirits....or a vacuum leak in one of the doors...or both.

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1983 300D
1978 BMW R80/7
1997 Jeep TJ

A vacuum leak in the "locked" circuit of the door looks, which is only aligned to the vacuum system when the drives door is locked (yellow vacuum lines with a red stripe).

Pretty sure I know just the culprit. The front passenger I alway shave to lock by hand after the others lock themselves. Just gotta get time to get in there.

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1983 300D
1978 BMW R80/7
1997 Jeep TJ

I wish! Mine doesnt push far enough to shut the engine off.

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NC Benz
Fuquay-Varina, NC
1979 300D
1983 300D Turbo 260,000 Miles
1984 300D Turbo 345,000 Miles (sons car)
OBK #31
1998 Ford Expedition 5.4l (fer Haulin'!) 145,000
1973 19' SeaRay with 115 Mercury TOWER OF POWER!
Club Car Golf Cart 36V
Ex toys:
1967 Mustang 289 (First Car)
Fiat 124TC
1975 Honda CVCC
1980 Audi 5000 Turbo

If the car has a manual idle adjustment, turn it all the way down, then push the stop lever. I had to do this on my 1980 300TD until I repaired the vacuum pump. If no manual adjustment in the cab, maybe turn down the idle speed at the engine. Manually move the throttle linkage and observe what is stopping the movement at the low end of the travel. Steve