Isx shutting down randomly

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by RSB34, Aug 29, 2018.

  1. RSB34

    RSB34 Light Load Member

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    The shop only has a doner for a cm870 they have different connections. Have not been able to locate a doner.
     
  2. RSB34

    RSB34 Light Load Member

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    Mobile repair Boise had said checking the ground from the frame to the block.so far I have not found a direct frame to block ground. I found frame to starter then starter to block. And frame to cab. There has to be one I would think. That may be a problem
     
  3. VWbeagle

    VWbeagle Bobtail Member

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    Been having problems with one of the trucks in the fleet similar to the issues you are having. Turned out to be a loose fuel fitting on the “T” fitting under the cab going to the filter, kept sucking in air and shutting down.
     
  4. RSB34

    RSB34 Light Load Member

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    I don’t know if this will mean anything. When I turn my key on the lift pump takes a few minutes to turn on. If you try starting it. It will just crank. There will be no power to the fuel shut off ( between the fuel timers and meters) when the lift pump kicks on there is power to the fuel shut off. When the truck dies it loses power to the fuel shut off.
     
  5. RSB34

    RSB34 Light Load Member

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    Also ther is no power to the shut off
     
  6. Techmaster

    Techmaster Bobtail Member

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    Any active/inactive codes?
     
  7. Justrucking2

    Justrucking2 Road Train Member

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    Turn the key and have a buddy hit the ECM with a screwdriver. See what happens. ECMs do wear out. I have a new one sitting in my closet, 2008 CM-871... Lifespan on an ECM is 8 to 10 years. Just saying.
     
    Oldironfan Thanks this.
  8. RSB34

    RSB34 Light Load Member

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    The dealer it was at just said it was the ecm was losing contact. They ran a new wire from the ecm to the circuit breaker. Said all was good as soon as it left the shop it was stalling again.
     
  9. RSB34

    RSB34 Light Load Member

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    At this point I’m leaning towards a ecm but hoping it was a simpler fix.
     
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