Hard to kill the engine - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 08-21-2004, 02:04 PM Thread Starter
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Hard to kill the engine

We have a 79 300sd and when you go to turn engine off the motor wants to stay running, after you reve the motor up and turn the key it will cut off. Help us please.
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post #2 of 4 (permalink) Old 08-21-2004, 02:36 PM
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RE: Hard to kill the engine

My car had it too.

Run some valve cleaner in your gas, on old cars I've read that you should do this often. Seems if there are deposits in your valves they stay hot and ignite any left over fuel.

Also you may be running rich, or have a fuel injector stuck open.

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post #3 of 4 (permalink) Old 08-21-2004, 04:09 PM
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RE: Hard to kill the engine

I'm no expert on these (or any for that matter). I believe your system shuts the fuel off when you turn off the key. It does that through a vacuum actuated control. Chances are, a vacuum line has started leaking with age. Try finding the control and placing a vacuum on it or simply replace this vacuum line with new. That may or may not fix your problem but at least it's a cheap first attempt. Of course, someone who actually knows something about these may give better advice in the meantime.
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post #4 of 4 (permalink) Old 08-21-2004, 07:15 PM
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RE: Hard to kill the engine

…someone already did: E300POS is correct, you have a vacuum leak. Once fixed your engine will stop.
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