Well, I discovered how to shut down my car manually. I found out on Friday when I got to work I discovered that my car wouldn't shut off. I know y'all are used to it, but it freaked me out a bit.

Now to fix it. How do I track the vacuum leak? Is it just one line? I travel alot, so the dealer may be my only option to fix it in the next few weeks if I can't track it down tomorrow.

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86 300 SDL - Vesuvius

96 SL 500

Assumption is the mother of all screw ups.

Do not go gentle into that good night. Rage, rage against the dying of the light. - Dylan Thomas

All that is necessary for the triumph of evil is that good men do nothing - Edmund Burke

Not familiar with the SDL's, but a vac leak somewhere sounds like the culprit, others may be of more help, but diagnosing with a mighty-vac should be the way to go.

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83 SD

84 CD

As you know the shut-down vac device is located aft on injector pump. Start with cuttin back ALL rubber joints and elbows 1/4" to make em tighter throughout the vacuum system. Basically prowl existing vacuum joints and elbows with razor blade, detach then cut and reattach each one for starters. An easy job that requires no expertise.

Granted my experience is not with a W126, but all of my vacuum leaks that caused a no shut off on my W123's was always a leak in a door lock actuator. One thing that happened every time was if I shut the car off and it kept running I could lock the doors and then the engine shut off. If you want to try yourself get a diagram of the vacuum lines.

I have an easy test and short term solution. Attach a long piece of vacuum hose to the shut off valve. Suck on it. Three quick strong sucks should shut it down. If it works, you know the vacuum leak is elsewhere in the system. To save yourself some money until you can track it down (and learn about the vacuum system in the process), just feed the vacuum line out of the cowl, leaving about a foot protrubing from the engine compartment, then shut the hood. You can know shut down your engine without opening the hood by sucking on the hose and using the shut off valve. If you're discreet and feign inspection of a windshield wiper, no one will even know what you're doing and will think you have a delayed ignition feature.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

I am having trouble finding the actual lines. I noticed that there is a W126 diagram as a sticky here, is that the diargram I use?

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86 300 SDL - Vesuvius

96 SL 500

Assumption is the mother of all screw ups.

Do not go gentle into that good night. Rage, rage against the dying of the light. - Dylan Thomas

All that is necessary for the triumph of evil is that good men do nothing - Edmund Burke

Not sure because yours has a different engine than the early 126's. There should be a vacuum line going directly to the shut off valve at the back of the injection pump. If the colors are the same as earlier models, it is brown.

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13