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Old 11-22-2013, 08:46 AM   #1
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Engine cutting off while driving

While driving the coach will just loose power, sometimes after going over a bump other times while on a smooth road , after pulling off road the coach will start up and drive as if nothing happened. I have replaced lift pump, fuel sensors and cap valve Thank for your help
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Old 11-22-2013, 09:03 AM   #2
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What year and what engine do you have?
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Old 11-22-2013, 09:06 AM   #3
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Sounds like an intermittent electrical problem. Suggest checking all the chassis battery connections.
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Old 11-22-2013, 10:22 AM   #4
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2003 400 ILS Cummins
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Old 11-22-2013, 10:23 AM   #5
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Checked those will try again
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Old 11-22-2013, 10:33 AM   #6
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I didn't want to jump in with suggestions if you have a different engine to mine which you do. But did you change the lift pump etc. because you had fuel starvation or was that just a guess? FWIW I had a similar symptom (engine going to idle suddenly) and it turned out to be a faulty transmission sensor. The transmission thought it was overheating and shut down in to limp mode. It may be worth paying some money to get Allison and Cummins techs. to run a computer diagnostic as that was the only way I found my problem.
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Old 11-22-2013, 10:47 AM   #7
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Changed lift pump because on computer got a fault on the fuel system so we started there. Also changed the cap valve and fuel sensors, at this point thinking electrical. Wanted to find out if anyone one had same or similar problem. Just bought in august.
Thanks for the input. will take all suggestions
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Old 11-22-2013, 12:54 PM   #8
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You say you replaced a tranny sensor because your engine would go to idle! Which sensor?
My engine would go to idle and Cummins replaced the accelerator pedal assembly because you can't buy just the sensor. Now it is doing it again. Pedal assembly is over $600.00. Just wonder if they got it right or is there something else needing replaced.
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Old 11-22-2013, 01:06 PM   #9
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In my case it turned out that it was an internal wiring problem that affected several sensors so it wasn't strictly one sensor that failed it just looked like that in the diagnostics. I have a different transmission so the codes may not be the same. Here is the code book for your transmission if you don't have it already.
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Old 11-22-2013, 01:18 PM   #10
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Completely different answer but last summer mine would cough and sputter and lose power and then minutes later it would be all right for awhile.

Checked a lot of items I thought it might be but finally discovered it was the fuel filter plugging up. Changed it and no problems since then.

Apparently when the previous owner told me he had changed the filter he didn't say how long ago!

Good luck with yours.
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Old 11-22-2013, 07:16 PM   #11
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If you haven't replaced the fuel filter that sure would be next. On some ISC and ISL engines there are two fuel filters that should be check on.
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Old 11-22-2013, 08:03 PM   #12
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Definitely an electrical problem. Definitely.
IIWMI'd do a front to back connector & wire loom check. Unclip & check each connector for corrosion & tight electrical fit. Check all looms for rub spots.
I had a goofy problem w/my AquaHot recently; coulda started swapping parts but I was a long way from parts (thankfully). It was an internal connection that was weak.
Isn't therea sensor on the trans called a Vehicle Speed Sensor? If that was bad it could produce these symptoms I think.
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Old 11-22-2013, 11:25 PM   #13
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Do not forget to check the ignition switch. Bad or weak contacts could give you that type of symptoms you are describing.
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Old 11-23-2013, 12:57 AM   #14
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Just so you don't run out of things to check; there is a thin white wire that connects to the large ground lug on the curb side of the engine. It comes from the engine control module(ECM) and in many cases was not routed very carefully when it spanned the gap from the battery compartment (location of the ECM) to the engine ground. As a result it can be subject to considerable flexing or even snagging which can separate the inner conductors without breaking the insulation. To verify that you problem is not that wire, jiggle it while the engine is running and see if the engine cuts out. Good luck!
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