# Mercedes wont give up

**URL:** <https://community.cartalk.com/t/mercedes-wont-give-up/16607>\
**Category:** Maintenance/Repairs\
**Created:** [July 12, 2008, 9:24pm UTC](https://community.cartalk.com/t/mercedes-wont-give-up/16607 "2008-07-12T21:24:58Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![benzmidlife50](https://avatars.discourse-cdn.com/v4/letter/b/db5fbb/32.png) [@benzmidlife50](https://community.cartalk.com/u/benzmidlife50)\
**Post date:** [July 12, 2008, 9:24pm UTC](https://community.cartalk.com/t/mercedes-wont-give-up/16607/1 "2008-07-12T21:24:58Z")

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My 84 mercedes wagon often “diesels” for several minutes after shutting the ignition off. I know the vaccum system is tied into the shutoff, but where di I start looking for the leak?

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**Author:** ![oldschool](https://avatars.discourse-cdn.com/v4/letter/o/e19adc/32.png) [@oldschool](https://community.cartalk.com/u/oldschool)\
**Post date:** [July 13, 2008, 2:59am UTC](https://community.cartalk.com/t/mercedes-wont-give-up/16607/2 "2008-07-13T02:59:27Z")

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Is your car a diesel?I know your OP reads after shutting of the ignition.I have seen a Mercedes diesel that the engine would not shut down due to a vacuum leak.But I am no Mercedes deisel tech.How Mercedes generates the vacuum on their diesels i dont know

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**Author:** ![GreasyJack](https://avatars.discourse-cdn.com/v4/letter/g/df705f/32.png) [@GreasyJack](https://community.cartalk.com/u/GreasyJack)\
**Post date:** [July 13, 2008, 3:13am UTC](https://community.cartalk.com/t/mercedes-wont-give-up/16607/3 "2008-07-13T03:13:10Z")

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I also have no idea about how to go about diagnosing the shutoff system, but I can tell you that there should be a tab connected to the linkage under the hood that you can push down to manually shut the car off.

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**Author:** ![hellokit](https://avatars.discourse-cdn.com/v4/letter/h/6a8cbe/32.png) [@hellokit](https://community.cartalk.com/u/hellokit)\
**Post date:** [July 13, 2008, 3:13am UTC](https://community.cartalk.com/t/mercedes-wont-give-up/16607/4 "2008-07-13T03:13:36Z")

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The fault’s mine. Sometimes, I just don’t understand too good. Would you explain your situation in a little more detail? Does the engine have a carb, or, is it diesel? What would the “shutoff” be shutting off? Fuel? Air?

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**Author:** ![ok4450](https://avatars.discourse-cdn.com/v4/letter/o/e9bcb4/32.png) [@ok4450](https://community.cartalk.com/u/ok4450)\
**Post date:** [July 13, 2008, 5:33am UTC](https://community.cartalk.com/t/mercedes-wont-give-up/16607/5 "2008-07-13T05:33:13Z")

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I’m not real sure if we’re talking about a diesel engine continuing to turn over or if it’s a gas engine that is dieseling.

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**Author:** ![Craig58](https://avatars.discourse-cdn.com/v4/letter/c/3da27b/32.png) [@Craig58](https://community.cartalk.com/u/Craig58)\
**Post date:** [July 13, 2008, 4:26pm UTC](https://community.cartalk.com/t/mercedes-wont-give-up/16607/6 "2008-07-13T16:26:33Z")

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If it is a diesel engine, a vacuum leak will prevent the key from shutting off the engine because the fuel shut-off is vacuum operated. If it is a gasoline engine that is “dieseling” after the ignition is shut off, it is probably in need of a “turn-up.”