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Old 06-23-2003, 07:46 PM
Posts: n/a
Shut off problems with 300td

I have a situation for all you knowledgeable gentlemen out there... my husband is working (long distance from me) on an 82 300TD wagon. Everything was working ok until just recently when he found that it won't shut off with the key. He says that all the vacuum lines appear to be hooked up, if he disconnects a supply line and holds his thumb over it, he doesn't feel any vacuum. All the other vacuum run systems including the windows are still working fine.
Where else should we be looking at to tell what the problem is stemming from?
Please understand that we don't have a manual to look at so any info you can pass along on where to look or what to try is greatly appreciated.

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Old 06-23-2003, 08:51 PM
Registered User
Join Date: Jan 2003
Posts: 196
sounds like

you need a vacuum shut off valve.. there should be a red stop button right above the injection pump to manually turn off the car at least there is one in my 1990 and 192 diesels
1994 S-350 6cyl Turbo Diesel 158k

1998 300d 6 cyl Turbo Diesel 143K

1993 2.5 124 Turbo-Diesel 236

1990 2.5 124 Turbo-Diesel 228k


SOLD 1977 Jaguar XJ6 Coupe Antique Roadster 85K

SOLD 1993 2.6 6 cyl 190 E 150k

SOLD 1992 2.5 124 Turbo-Diesel 204k

RIP 1992 124 300 TD 265K OIL PUMP QUIT @ 85MPH
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Old 06-23-2003, 08:57 PM
edge's Avatar
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Join Date: May 2001
Location: CT
Posts: 1,398
Yeah, use the manual stop until he gets home and then he can debug it at home.
85 300CD Signal Red/Tan sold
83 300D Manganese Brown 109K
97 E420 Midnight Blue 197K sold
98 BMW 328i Vert White 100K, sold
95 BMW 525i White 125K, sold
93 BMW 525iT Red 193K, sold
95 E320 Green Wagon 125K, sold
94 E320 White 127K, sold
85 300SD 156K Grey (Annie), sold
84 300D Lapis Blue 170K (Judy), sold
99 ML 320 Black (lease), 1998 C230 White (lease)
00 Honda S2000 Red (lease)
86 Mercedes 300E (sold)
84 Porsche 911 Red (sold), 1965 Porsche 911 White (sold)
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Old 06-23-2003, 09:23 PM
84300DT's Avatar
Senior Member
Join Date: Jan 2002
Location: Mass.
Posts: 2,219
agree troubleshoot at home, in meantime he can shut off via the red shutoff on the throttle linkage. if there is no vacuum supply it could mean a failing vac pump. if brakes still work ok then drive home. windows are electric not vacuum controlled.
keep us posted.
1984 300D Turbo - 231k....totalled 11/30/07 RIP
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Old 06-24-2003, 06:49 AM
engatwork's Avatar
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 12,781
Welcome aboard Dot.
The windows don't have anything to do with the vacuum system. The door locks do. Do the door locks work? If they do then you have vacuum where you are supposed to have it. Look around real well at the firewall adjacent to the brake booster (the big round thing located on the firewall on the drivers side). Next to it you will see a bunch of vacuum lines going through the firewall. The brown ones are for the shut off. The yellow ones are for the door locks. Make sure everything is secure and in place. If you find the brown vacuum line coming into the back of the injection pump between the pump and the oil filter housing then you have found the actual vacuum line that pulls in the shut off valve. You need to try to test and see if you have vacuum on this line when you turn the key off. If you do then it is the actual shutoff valve itself. If you don't then you have a vacuum leak/issue somewhere else. Get hubby to purchase a MityVac if he does not already own one.

If hubby ends up having to replace the shut off valve MAKE SURE one of ya'll come here (or do a search) and ask alot of questions concerning how it goes back in. It is pretty easy to replace BUT if improperly installed can cause some SERIOUS runaway issues with the engine.
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Old 06-24-2003, 11:45 AM
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Join Date: Oct 2001
Location: st paul, mn
Posts: 284
yes, get the mity-vac. They are cheap and invaluable. I just got one for $26 at Auto Zone - the shut off valve was the culprit on my car. -Andy

andy t
'78 300d
'95 volvo 850, wagon
'86 300sdl - engine out, maybe I'll have it rolling by June

whole bunch o' bicycles
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