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6nz cracking up

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

Page 3 of 5
  1. Dec 11, 2011 #21
    pup

    pup Light Load Member

    252
    256
    Dec 3, 2011
    n.h.
    0
    Any chance the cam is off a tooth? Did the gear mark line up perfectly with the arrow on the housing? Sounds like retarded timing.
     
    pup, Dec 11, 2011
    pup, Dec 11, 2011
    #21
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  3. Dec 11, 2011 #22
    ROBSREDFORD

    ROBSREDFORD Light Load Member

    266
    140
    Sep 2, 2008
    MIDLAND, NC
    0
    Will trade call seven zero four five zero seven 2 four five three
     
    ROBSREDFORD, Dec 11, 2011
    ROBSREDFORD, Dec 11, 2011
    #22
  4. Dec 11, 2011 #23
    little cat 500

    little cat 500 Road Train Member

    2,061
    1,109
    Jan 17, 2010
    Abbottstown PA
    0
    no i tryed cam timeing straight up then one ahead then one tooth late seams to be the same in all robsredford let me think just a bit more on this before i start pullin it out
     
    little cat 500, Dec 11, 2011
    little cat 500, Dec 11, 2011
    #23
  5. Dec 11, 2011 #24
    Mr. Haney

    Mr. Haney Road Train Member

    2,693
    2,041
    Dec 17, 2008
    0
    The cam won't cause any issues under full load acceleration at any RPM. If the engine has a load against it it will rev to max RPM without breaking up. You have a fuel problem somewhere or a bad injector
     
    Mr. Haney, Dec 11, 2011
    Mr. Haney, Dec 11, 2011
    #24
  7. Dec 11, 2011 #25
    little cat 500

    little cat 500 Road Train Member

    2,061
    1,109
    Jan 17, 2010
    Abbottstown PA
    0
    ok thanks kurt i just jacked the timing till i got the check eng light didn't help revs quicker still breaks up im with you on the bad injector fuel line's and tranfer pump are new and running it from a bucket didn't change things ether so i guess it's back to finding the junk injector again kinda sounds like a fuel knock when cold also i did forget to post that kinda like a detroit sound
     
    little cat 500, Dec 11, 2011
    little cat 500, Dec 11, 2011
    #25
  8. Dec 11, 2011 #26
    Far_Call

    Far_Call Medium Load Member

    453
    416
    Aug 21, 2009
    Australia
    0
    You really should do a Cylinder cut out test before you go any further. Seeing its missing in neutral at 2000RPM you should be able to pin it down to a Cylinder in a few minutes.
     
    Far_Call, Dec 11, 2011
    Far_Call, Dec 11, 2011
    #26
  9. Dec 11, 2011 #27
    little cat 500

    little cat 500 Road Train Member

    2,061
    1,109
    Jan 17, 2010
    Abbottstown PA
    0
    did a cut out there all about the same the miss or whatever it maybe it kinda missis on them all kinda like like it's fluttering or bounceing though them all hard to explain but i breaks up like an old car with glass packs on it
     
    little cat 500, Dec 11, 2011
    little cat 500, Dec 11, 2011
    #27
  10. Dec 11, 2011 #28
    Far_Call

    Far_Call Medium Load Member

    453
    416
    Aug 21, 2009
    Australia
    0
    If its doing it that bad but its not a particular cylinder then its more likely fuel pressure across the board.

    Did you test Fuel pressure After the secondary filter filer before the head? test at Idle and all the way through to when it misses.
     
    Far_Call, Dec 11, 2011
    Far_Call, Dec 11, 2011
    #28
  11. Dec 11, 2011 #29
    little cat 500

    little cat 500 Road Train Member

    2,061
    1,109
    Jan 17, 2010
    Abbottstown PA
    0
    fuel pressure was tested on the filter houseing on the block before the head with the old transfer pump and another used one i tryed so went and got a new pump and same thing line from houseing to head is new and the return on the back of the head is new and all the draw line from tank are new check valve new
     
    little cat 500, Dec 11, 2011
    little cat 500, Dec 11, 2011
    #29
  12. Dec 11, 2011 #30
    cowcatcher

    cowcatcher Light Load Member

    58
    12
    Dec 11, 2011
    Ridin' round with the top down !
    0
    You might have a cut injector oring. You really should hook up a clear hose in the supply and return lines. This will tell you if you are sucking air or "making" air on the return side. If you have a cut oring the compression will force the fuel away from the cylinder.
     
    cowcatcher, Dec 11, 2011
    cowcatcher, Dec 11, 2011
    #30
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