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Cummins 400 cuts out under heavy throttle

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Wildcat74, Dec 23, 2011.

Page 1 of 3
  1. Dec 23, 2011 #1
    Wildcat74

    Wildcat74 Medium Load Member

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    Jul 15, 2008
    Omaha, NE
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    Just bought another truck today with a 400 Cummins so I don't know much about the truck. Under heavy throttle leaving from a stop light the truck cuts out 4-5 times while under heavy acceleration until it's back at highway speeds. Trucks runs smooth at idle (though the idle is on the high side too) and driving speed, it's only when under throttle that it happens and then it clears right back up again. Any ideas as to what I should be looking for? Going to be changing the fuel filters tomorrow and will be looking over the truck more than I got a chance to today.
     
    Wildcat74, Dec 23, 2011
    Wildcat74, Dec 23, 2011
    #1
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  3. Dec 23, 2011 #2
    bender

    bender Road Train Member

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    Injector cam lobe failure. Pull the valve covers and check injector lever travel, pull pan and inspect camshaft injector lobes.
     
    bender, Dec 23, 2011
    bender, Dec 23, 2011
    #2
  4. Dec 23, 2011 #3
    Wildcat74

    Wildcat74 Medium Load Member

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    Omaha, NE
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    The miss is not steady, kind of intermittent. Wouldn't an injector cam lobe be a little more of a steady thing throughout all RPM ranges?
     
    Wildcat74, Dec 23, 2011
    Wildcat74, Dec 23, 2011
    #3
  5. Dec 23, 2011 #4
    bender

    bender Road Train Member

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    Nope, they act just like you describe at higher rpm under heavy load with a rapid misfire.
     
    bender, Dec 23, 2011
    bender, Dec 23, 2011
    #4
  7. Dec 23, 2011 #5
    Wildcat74

    Wildcat74 Medium Load Member

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    Jul 15, 2008
    Omaha, NE
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    Any idea what I'd be looking at pricewise getting this fixed?
     
    Wildcat74, Dec 23, 2011
    Wildcat74, Dec 23, 2011
    #5
  8. Dec 24, 2011 #6
    bender

    bender Road Train Member

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    It's been a long time since I've done one and I don't know the parts prices. Labor could vary widely depending on if it needs cam bearings which they commonly do and you won't know until you take it apart.

    You might be way ahead swapping your engine into the replacement truck but I would first confirm the camshaft is bad.
     
    bender, Dec 24, 2011
    bender, Dec 24, 2011
    #6
  9. Dec 24, 2011 #7
    Wildcat74

    Wildcat74 Medium Load Member

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    Jul 15, 2008
    Omaha, NE
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    Old truck has got a 3406, Cummins is a new ballgame for me. I'll be messing around with the truck tomorrow so I'll check things out.
     
    Wildcat74, Dec 24, 2011
    Wildcat74, Dec 24, 2011
    #7
  10. Dec 24, 2011 #8
    bender

    bender Road Train Member

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    I'm just thinking rather than sinking 5 grand plus into a 400 Cummins, that 3406 would set right in it's place without too much trouble.
     
    bender, Dec 24, 2011
    bender, Dec 24, 2011
    #8
  11. Dec 24, 2011 #9
    Wildcat74

    Wildcat74 Medium Load Member

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    Omaha, NE
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    New cam and bearings run about $500. No way in hell it's going to take anywhere near $4500 in labor to replace them. I'll be gutting this one out with Cummins one way or the other.
     
    Wildcat74, Dec 24, 2011
    Wildcat74, Dec 24, 2011
    #9
  12. Dec 24, 2011 #10
    vegetto05

    vegetto05 Light Load Member

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    Jan 5, 2009
    KC, MO
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    what? are you new?

    lets start with the simple explanations first. go ahead and change the fuel filters and see how the that goes. while you're in there priming the system, check for leaks. aside from that, you can't really tell anything without insite - cummins electronic diagnosing program. i would more or less leaning towards the fuel gear pump, but it is possible to have an injector going out of it, although an injector failure for an isx is very rare.
     
    vegetto05, Dec 24, 2011
    vegetto05, Dec 24, 2011
    #10
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