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Discussion Starter #1
I have a 1985 mercedes 300DT with @65,000 on it.
Few days ago,after changing oil, oil filter, air filter and adding some fuel injector's cleaner to the tank, the engine does not shut off when I turn off the key. I have to turn it off by the lever on the engine.

Any suggestion on what might have happened??

Thank you

Bill de Rosa
[email protected]
 

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Wow! That's some nice low mileage!

The most common failure that causes this is the vacuum servo that is located above (and actuates) the shutoff lever.

(shown here: http://catalog.eautopartscatalog.com/cherokee/quote.jsp?clientid=importpartsonline.com&cookieid=1DW14EV9Y1KW0YL1D1&baseurl=http://www.importpartsonline.com/&partner=cherokee&year=1985&product=D2020-11537&application=000004561 )

Since this problem is immediately following some underhood work, it could just be that a vacuum line was knocked loose. Look around the areas that you were working on. If you find nothing, then check the vacuum servo with a mityvac.
 

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Discussion Starter #3
engine not shutting off

Hi Cracker928:

Thank you for your reply; I will check the vacuum servo as you suggest as wellas all the connections.

Is it possible that somehow the transmission operation is affected?? It seems to be shiftingh gear in a rougher way.

Thank you,

Bill
 

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Yes, a vacuum leak can make the transmission shift harshly. That, and sometimes a loss of power are often my first indications that I have snagged a vacuum line loose. My most common loose hose sites are around the oil filter and near the brake booster/firewall area.
 

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i had same problem in a 300D i just bought this summer. it would take 45 sec to shut off.

replacing the vaccum valve was about $90 for the part and then labor added on for my mechanic.

can probably get the part cheaper here at importparts

solved the problem
 

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Similar problem

I recently bought a 79' 300D and I have a similar problem. The engine shuts off fine except in the morning. I drive about 15 miles to work and it takes a good 10 minutes to get it to shut down. Taking the key out only reduces the idle rpm. Eventually I can take the key out and put it into drive and it will stop. Vacuum problem? Moisture maybe?
 

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Moisture is not likely to be a problem. For what you describe, my first guess would be to check the vacuum servo as described above.
 
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