1982 240D W123 Doesn't Turn Off...

W123 Diesel with an interesting concern. It seems to stay running even with the key in your hand. This can be caused by several issues. There are 5000 vacuum lines in old Mercedes cars, these are their problems.

[@addisondiesel]

Great job tracking down the source of the problem! Keep up the good work!

[@dinamitasquad2885]

This helped me fix my issue thank you ❤

[@FriendlyMBTech]

You're welcome!

[@kuldipdhak7972]

Very nice video

[@FriendlyMBTech]

Thank you!

[@DavidValencia-tc9rj]

Thank you, thank you

[@FriendlyMBTech]

You're very welcome!

[@lindabruce7924]

You are awesome young man!!!

[@FriendlyMBTech]

Thank you!

[@jenb6018]

Wow my husband is so smart and good looking ❤️

[@CarlosRodriguez-lr4ee]

Great explanation, thanks

[@FriendlyMBTech]

You're very welcom!

[@cblondesreport]

...darn, I just went outside to do this when I noticed someone prior already plugged it. Would have been such an easy fix :-)

[@FriendlyMBTech]

Is your car not turning off? It could be the vacuum actuator on the back of the fuel injection pump. If the diaphragm inside the actuator leaks vacuum, the actuator won't be able to cut fuel to the injection pump to turn off the vehicle.

[@cblondesreport]

@@FriendlyMBTech ... now I don't now if this is a clue to what could be the issue, BUT my W123 did not turn of suddenly, but rather slowly meaning in the beginning it would turn off after like 10-15 seconds. That makes me believe that I just need to find the spot that got a little bit "leaky" .

[@FriendlyMBTech]

@@cblondesreport I would start by checking the that vacuum diaphragm at the rear of the fuel injection pump. If it has a small leak, it will do exactly what you're describing.

[@peace5655]

interesting!

[@redrhino1911]

Pressure washed my engine bay, wouldn’t shut off and the pressure from the water must’ve disconnected one of the vacuum lines. 5 second fix and it shuts off again.