98 w900 keeps cutting out

Discussion in 'Kenworth Forum' started by irishluck09, Oct 5, 2022.

  1. irishluck09

    irishluck09 Light Load Member

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    Nov 24, 2019
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    W900 n14 cummins 13spd

    So we've been chasing this problem for a few months now.
    The truck rolls down the road alright but will just randomly cut in and out. I took a video (for sound) that will show kind of what's going on.

    We have recently replaced the main engine wiring harness, new fuel pump and fuel cutoff solenoid ( even though my truck doesn't use the solenoid to shutoff).

    But the truck still cuts in and out. Has a hard time pulling hills even when empty.

    We're possibly leaning towards the throttle pedal but im just not sure. Anything else could look at to figure this out?

    Links below are of the exhaust where you can hear the cutting in and out.

    https://youtube.com/shorts/8cClN1XpxhQ?feature=share

    https://youtube.com/shorts/y6JWfNUVqUw?feature=share
     
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  3. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    What does your truck use if not using the fuel solenoid?
     
  4. ProfessionalNoticer

    ProfessionalNoticer Road Train Member

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    Are you able to replicate the issue while not driving the truck?
     
  5. irishluck09

    irishluck09 Light Load Member

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    No, it's only while driving unfortunately. Wether I'm empty, loaded or bobtailing.

    I can sit and revv it up with no cut outs though
     
  6. irishluck09

    irishluck09 Light Load Member

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    The ecm. I'm not exactly sure ehst it does but it's set through the ecm.

    I can take the wire off that solenoid and remove the guts out of it and the truck still shuts off
     
  7. blairandgretchen

    blairandgretchen Road Train Member

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    Those scan guages are kinda handy for things like diagnosing dash readings and sensors - there’s a TPS reading on them that would verify the throttle position sensor while rolling.
     
  8. ProfessionalNoticer

    ProfessionalNoticer Road Train Member

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    Sounds like it needs some sort of load, even if just the weight of the truck. I'd be checking the fuel system for air. Maybe run some clear tubing in line with your main suction line long enough to see from the drivers window while driving. Look for bubbles. Or maybe find a dyno nearby and see if you can rent it by the hour. Of course if all else fails the dealer can handle all that too.
     
  9. irishluck09

    irishluck09 Light Load Member

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    Well we figured out the issue and it isn't one that I would have ever thought about it.

    Turns out the coolant level sensor had a wire exposed and was grounding out from touching one of the AC lines. Hasn't missed once in over a week now.
     
    Bean Jr., Opendeckin, lester and 2 others Thank this.
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