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Old 02-03-2010, 08:58 PM   #1
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diesel engine doesn't turn off with key

My diesel engine on 94 landyacht will not turn off with the key. Have pulled relays with key off still runs. Help
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Old 02-03-2010, 10:25 PM   #2
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Depending on which engine you have, you could have a bad cutoff solenoid, or the alternator could be feeding back through the wiring. You could have an LP leak, but that would normally cause the engine to run away, not merely continue idling. Have you tried pressing the accelerator, and seeing if the engine continues running normally, or "surges"?
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Old 02-04-2010, 12:02 AM   #3
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Originally Posted by overlander63 View Post
Depending on which engine you have, you could have a bad cutoff solenoid, or the alternator could be feeding back through the wiring. You could have an LP leak, but that would normally cause the engine to run away, not merely continue idling. Have you tried pressing the accelerator, and seeing if the engine continues running normally, or "surges"?
Terry is right about the cutoff solenoid. That would be the first thing I would check.

The injector pumps usually fit a wide variety of different engines. For example, the old Chevy diesels used a Roosa Master pump and shared solenoids with several models of John Deere, Allis Chalmers, and others. Several engines that use the Bosch pumps, including Mercedes have much in common with several Deer, Allis, and Cat engines.

If you need a solenoid, you may be able to find one locally at a farm equipment facility, not just truck places. Handy in a pinch, especially if the need arises in farm country. Be sure to get the correct voltage. I have seen ones that pretty much looked identical, but one was 12v and the other was 24v. They are marked, but be sure to check.
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Old 02-04-2010, 12:59 PM   #4
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tried that

cut off selenoid works, if I pull ignition fuse engine stops. Any more ideas?
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Old 02-04-2010, 01:16 PM   #5
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Check the alternator wiring. As a test you can disconnect the field power, voltage sense, and idiot light connections from the alternator and see if that's part of the problem. It often is. Leave the big output wire hooked up.
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Old 02-04-2010, 01:18 PM   #6
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cut off selenoid works, if I pull ignition fuse engine stops. Any more ideas?
OK, that's good.

Check and see if the ignition switch itself if good. It may still be allowing current when it should be off. I have had problems with the switches themselves in the past. You can move the lock part from the existing switch to a new one, so re-keying is not an issue.
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Old 02-04-2010, 06:51 PM   #7
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have you tries turning the key as far back as the accessory position?
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Old 02-06-2010, 02:56 PM   #8
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I was curious about this when it was posted. Has the cause been found?

regards,
Ken
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Old 02-07-2010, 08:49 PM   #9
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I wish a cause had been found.
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Old 02-07-2010, 08:53 PM   #10
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May be a long shot but I had the cruse control cause the same problem only I had a high idle to go with it.
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Old 02-07-2010, 09:48 PM   #11
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Hit the road,
If you could find either the Engine Serial Number or CPL(control parts list) number, they both will be on the engine data label, which is located on the engine valve cover or fuel pump side of the engine. Your engine has an electronic control module(ECM) there could be a couple different ones, from the engine serial number or CPL number I can get Cummins service information that may help with finding the cause to your problem.
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Old 02-08-2010, 12:18 AM   #12
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Hit the Road,
I have been checking some Cummins Service info, I was incorrect your engine does not use an ECM. If you can still get the engine info I requested I can check Cummins service info for possible causes.
Tom
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Old 02-08-2010, 01:08 AM   #13
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I'm sure this has nothing to do with a 94 Landyacht, but my 92ish Cat shuts off when you push the throttle all the way off.
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Old 02-08-2010, 07:12 PM   #14
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I have a model# 85.9-230 . I do not know which is the serial# because there are many #s without labels. ref.# p111798 Family# rce359d6daab ( 3926649 19940208 )no labels on these 2. Catalyst # no.26233. I thank you in advance for your help. I have been trying to solve this problem for weeks.
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