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Old 01-09-2019, 08:20 PM   #1
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Engine shuts off after a couple minutes at idle.

Hi all,

Bus is a 2005 BB A3RE, 8.3 Cummins, 3060 trans. It has been driven over 500 incident-free miles since I bought it, over the course of four legs. I have had it in my work space, removing seats, ceiling, side panels, and A/C. During this time, I have started the bus up on two occasions just to run it a bit. Each time I have done so, the bus runs for what feels like about 3 to 5 minutes and then shuts off. It does this whether or not I am in the drivers seat. I have eliminated energency exits as the cause, and it did this before I removed the A/C so I am not thinking I caused it by removing something I should not have. Each time it does this, it restarts immediately and runs beautifully. Does anyone know if these buses have some kind of automatic inactivity shutdown timer installed? I have Googled the topic and read that some buses do, but have not found anything specific on them yet.
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Old 01-09-2019, 08:27 PM   #2
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I'd say yep, it has a shutoff timer. Should be a simple computer reprogram if you have the right tool to do it.
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Old 01-09-2019, 08:29 PM   #3
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I'd say yep, it has a shutoff timer. Should be a simple computer reprogram if you have the right tool to do it.


Thanks! It sure behaves as if that's the case. I'll look into it. Cheers, J
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Old 01-10-2019, 07:21 AM   #4
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I would check to see if it is throwing any codes. Mine will shutdown for a variety of reasons. One that I have experience with is low coolant. That was easy to figure out because the code told me what the issue was.
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Old 01-10-2019, 07:32 AM   #5
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im not sure on cummins, but ive seen in my computer settings for my navistar that it has the ability to turn on auto shutdown timers, hopefully something simple like that..



on navistar, timers are reset each time you press the brake pedal.. when you idle down sometime, after 2 minutes or so, press and release the brake pedal, and see if it runs longer..

-Christopher
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Old 01-10-2019, 09:06 AM   #6
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Christopher as always bringing the super helpful trivia!
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Old 01-10-2019, 10:18 AM   #7
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Had a 3208 Cat powered truck at work that had a shut down timer. If warmed and you turned off the key it would run for 5 min before shutting down.

I retired in '94 from that career after 30 years.
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Old 01-10-2019, 10:35 AM   #8
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I don't know what year it became use but commercial diesel started using idle timers for a couple of reasons fuel economy and emissions either the Feds or the Fleet owners did not want trucks sitting in truck stops or delivery idling for long periods of time.Since drivers wouldn't turn them off the computer does. Gene
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Old 01-10-2019, 10:39 AM   #9
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Had a 3208 Cat powered truck at work that had a shut down timer. If warmed and you turned off the key it would run for 5 min before shutting down.

I retired in '94 from that career after 30 years.



That was done to let the turbo cool down under oil pressure that practice did not last long though. Gene
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Old 01-10-2019, 02:08 PM   #10
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That was done to let the turbo cool down under oil pressure that practice did not last long though. Gene
Interesting...... Any idea why "it didn't last too long "?

I have it on one of my trucks and think it's a great idea. Is there some down side that I am missing?
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