Sticky Thingamajig, Engine won't turn off. - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 12-17-2015, 05:56 AM Thread Starter
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Sticky Thingamajig, Engine won't turn off.

Please forgive the ignorance on all items in the engine compartment but I am experiencing an issue and am hoping the esteemed members of this forum can help me diagnose.

I've got a 1976 300D with approximately 120,000 miles. I've owned it for 3 years and it is in very good shape. It's my daily driver. I live here in Scottsdale/Phoenix and it's been cold for the last few days. Right now I am parking the car outside at night where the temp is dropping to the low 30's.

Yesterday when I fired the car up in the AM and drove it to work I had to stop at the market just 3 or 4 minutes away. There the engine wouldn't turn off. This is not the first time the engine lingers a moment when the ignition key is turned off, normally I just turn the key and remove from the ignition and the engine will continue to turn only for a second but always stop. I was told this had something to do with the old vacuum system.

This time is different. The engine stayed running. And running. And running.

I immediately drove the vehicle home and tried to shut it off again. No success. This is when I popped the bonnet and pressed the lever that said "Stop" near the valve cover. This killed the engine.

Is this condition created or exacerbated from the cold weather? If I drive the car and get it to warm with this fix the problem? Or is there something more sinister going on here?

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post #2 of 3 (permalink) Old 12-17-2015, 06:33 AM
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post #3 of 3 (permalink) Old 12-17-2015, 09:14 AM
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Check the vacuum hoses leading toward the firewall driver side. One of those goes to the ignition switch. It often gets bumped off when changing the oil filter. Could be where this video shows, but could also be where it goes through firewall. But start where the video shows

If you find tubing is not disconnected, then follow Kent's video.

All of us 300D owners have been there

1972 350SL 4.5L - MBGraham, near Kingston, Ontario
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