Aloha, I just purchased an 84 300D, 130,000mi. It ran fine until today. It starts normal, but when I turn off the key it won't shut off for exactly 8 seconds. HELP!

Low vacumn output from your vac' pump or a leak in the system.

There's a RED ...STOP....lever on the valve cover to turn it off if it never does. Push it towards the engine..

You will need to check the available vac' pressure to see if it is the pump or a leak stealing the vacumn.

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[http://languageandgrammar.com/2008/01/14/youve-got-problems-not-issues/ ]

"A liberal is someone who feels they owe a great debt to their fellow man, which debt he proposes to pay off with your money."

It's impossible to kill these engines... even turning them off won't do it. Hah.


But yeah, vacuum leak.

The red stop lever works fine I can easily shut down under the hood.

Vacuum leak likely- my 201 does it too- but I haven't been able to locate the leak yet. In the mean time I just sit and wait for it.

For these vehicles the main culprits of vacuum loss are the door locks and/or the climate system.

If you want to isolate the problem, the door locks are the yellow line and the climate is the green line (under the hood at the firewall). Dont forget to plug the hole when you remove the line.

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350

I just helped a frind with a 85TD same problem. I located several vacuum leaks. 2 door locks, heater controls and the vacuum shut off valve.

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2009 CLS550 55,000
2004 ML350 144,000
2004 X5 95,000
2002 X5 165,000
1996 320S 155,000 (sold)
1991 190E 192,000 (sold)
1989 300SE 160,00 (sold)
1984 300D 210,000 owned since 85, (sold)
1984 300SD 160,000 (sold)