6nz cracking up

Discussion in 'Trucks [ Eighteen Wheelers ]' started by little cat 500, Dec 6, 2011.

  1. little cat 500

    little cat 500 Road Train Member

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    Abbottstown PA
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    injector harness is new and the wire from the ecm to the sensors is new to yes i did do a cut out but does not help it runs fine on the low end sounds more like it's altering cylinder when it cuts up it has two new injector's and four remans now im thinking i should get rid of the remans
     
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  3. mike simpson

    mike simpson Bobtail Member

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    Dec 6, 2011
    new haven ct
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    hello can it be valves leaking in the head can also cause that kind of lack of power
     
  4. little cat 500

    little cat 500 Road Train Member

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    Abbottstown PA
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    could be i was kinda thinking weak springs there not broke i just had the covers off they look fine and the valves looked good a couple months ago when i did the head gasket
     
  5. little cat 500

    little cat 500 Road Train Member

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    ok i put on a new lift pump seams to run ok headed to mi tomarrow see what happens loaded
     
  6. Rig Wrench

    Rig Wrench Medium Load Member

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    Dec 24, 2010
    northeast
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    How do you like that cam? what kind of improvement did you see?
    thanks
     
  7. little cat 500

    little cat 500 Road Train Member

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    Jan 17, 2010
    Abbottstown PA
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    ok lift pump help alittle but still not right rev it up fast in neutral it pops and cracks push pedal slow it will go to redline and not break up big wrench not sure if i like cam or not was thinking about putting a stock cam back in
     
  8. cowcatcher

    cowcatcher Light Load Member

    Sounds like its sucking air.
     
  9. little cat 500

    little cat 500 Road Train Member

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    ill try running with a fuel line off the tranfer pump into a bucket see what that does thanks
     
  10. swaan

    swaan Road Train Member

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    Jul 12, 2009
    BC canada
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    Is this thing doing this on a pull or just in the driveway reving the engine.
    I know I will get a lot of flack from people for saying this but, i would not be surprised if it is your cam you put in.
    Reason for saying this is I had the same cam in a 1lw I had and ended up taking in out and putting the stock one back in. It would make the engine do some weird stuff. One of them being exactly what your engine is doing.
    It would break up at high rpm backing the truck up in low gear, or just reving up parked. It would also cause the truck to surge and buck at low rpm cruise. Once I put the stock cam back in it ran perfect. And this is after I spent a lot of money on replacing everything else trying to rectify the problems.
    Did this engine start doing this just after the cam install?
     
  11. little cat 500

    little cat 500 Road Train Member

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    Jan 17, 2010
    Abbottstown PA
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    well the wierd stuff in neutral yes but going down the road it break's up going though the gears around 1900 to 2000 it will rev to redline if your wind it up real slow don't have a good stock cam to put back in and try wiped a lobe on the old one and i went with the 9710 but id trade some one for a good stock cam if they want to try there luck will this one
     
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