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Old 11-23-2013, 09:28 AM   #15
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I had the same problem, and it was resolved by changing out the accelerator pedal assembly. This was several years ago, and the problem has not returned.
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Old 12-01-2013, 07:27 PM   #16
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I had the same problem with my 2003 400 ISL. Check your ignition switch. Mine had push on connectors. I replaced it with a generic ignition switch with screw on (wrap wire around screw, then tighten) connectors several years ago. Problem solved.
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Old 12-01-2013, 09:56 PM   #17
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Sounds like you have a short on the fuel cut off valve. As diesels don't need electricity to run. They are shut down by the valve closing when the switch is turned off. Often the engine just quits when you hit a bump, and the bump causes the wire to short out as it hits something, and the valve closes. Been there done that. All you can do is trace it.

FYI. Should the valve short open. You can't shut down the engine either.
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Old 12-02-2013, 12:29 PM   #18
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For a mechanical injection engine, I'd be with terryallan- fuel shutoff solenoid is involved & therefore in the diagnosis. With poppet injectors, you have to stop fuel delivery mechanically.

I'm speculating (haven't checked it out in detail)- don't think the ISL (or the ISM, ISC for that matter) have the fuel shutoff valve. With the advent of electronic injectors, the ECM opens & closes 6 injectors to start/quit delivering fuel.
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Old 12-16-2013, 10:32 AM   #19
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Ignition Switch

Thanks for all that are trying to help with engine cutting off. Still having problems. Does anyone know what kind of ignition switch is on a 2003 Alpine 40 ft. with a 400 cummins engine. Looks like a GM Key.

Dan Notch
Raleigh NC
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Old 12-16-2013, 11:25 AM   #20
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Hello Dan glad you found the problem. If you remove the switch and take it to NAPA or any other good parts house they can match the plug on the back and sell the correct replacement switch.
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Old 12-16-2013, 12:52 PM   #21
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Might be the switch or it might be the connectors on the back. The more connectors I examine the more I find that have been tweaked so their grip is weak. Sometimes an adjustment on the spring clip portion of the connector makes solid contact again.
Sometimes its the switch itself; these things have plastic internal parts & cheap contacts that wear.
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Old 04-23-2014, 11:58 AM   #22
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2003 Alpine Cutting off while driving

Thanks to all that have replied. IT WAS the ECM. Finally got a new one after all else failed. Again thanks for all the ideas and advice.

Dan Notch
Raleigh NC
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Old 04-24-2014, 01:04 AM   #23
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I will throw this out for accelerator pedal problems some of you had. I have the ISL 425 that had the adjustable Kongsburg pedal. I was having trouble with it going to idle. Cummins codes said it was accelerator pedal.

I replaced it with a Williams truck pedal that I bolted to the floor. Parts are readily available and you can replace just the sensor. A few years ago I bought complete pedal with a sensor for $264. I has worked good with no problem.

To be on the safe side, I bought a repair sensor kit for $138 to carry with me.

I think WRV did use Williams pedals on the earlier Alpines.
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