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running rough with white smoke

Discussion in 'GM 6.5 Diesel Engines' started by john65td, Jan 14, 2013.

  1. john65td

    john65td Addicted to boost

    323
    0
    Jun 9, 2009
    Cassadaga New york
    i was drivng my truck today and when i came to a stop i noticed my truck was puking white smoke. its unburnt fuel i can smell it. also its running real rough shaking the truck. it starts fine just the miss and smoke. this leads me to believe one of my injectors died. am i heading in the rigth direction or is it the pump. the truck is all stock with 166k miles
     
  2. WarWagon

    WarWagon Well it hits on 7 of 8...

    5,782
    239
    Nov 15, 2009
    AZ
    The injectors are past the 100K rated life. Even the worst injector will start to fire at some point. Melting a piston when it does fire or scoring the walls from raw diesel is possible. Bad injectors can miss cold. The pump supplies all 8 so it works or doesn't on ALL 8.

    Likely you have other issues causing the miss. Pop the oil fill cap and look for a chug of smoke. Then suspect the rocker arm buttons for breaking and dropping a cylinder out from a closed valve. Maybe even a burnt valve.
     
  3. john65td

    john65td Addicted to boost

    323
    0
    Jun 9, 2009
    Cassadaga New york
    i don't think its a dead miss like bad cylinder. with the unburnt fuel smoke it lead me to injectors or pump
     
  4. tanman_2006

    tanman_2006 Just a farm kid...

    4,456
    47
    Feb 15, 2010
    Seiling, Oklahoma
    Sounds like an injector stuck open to me...
     
  5. john65td

    john65td Addicted to boost

    323
    0
    Jun 9, 2009
    Cassadaga New york
    that would create a loud knock wouldn't it? there is no abnormal noises just the rough running and smoke. if i reev it up to 2,000rpm it smooths out but still white smoke. head gaskets are good no coolant use or extra pressure
     
  6. sctrailrider

    sctrailrider Do it Your self, Feel good about it

    817
    41
    Jan 15, 2012
    Have you cracked each injector line open while at a idle yet to see if you can locate the cylinder that is missing ????

    Crack one at a time and see if the motor reacts one by one....
     
  7. john65td

    john65td Addicted to boost

    323
    0
    Jun 9, 2009
    Cassadaga New york
    im at work right now but i will and see what happens
     
  8. john65td

    john65td Addicted to boost

    323
    0
    Jun 9, 2009
    Cassadaga New york
    no change on 6 and 8 when i crack the lines so its teardown time
     
  9. john65td

    john65td Addicted to boost

    323
    0
    Jun 9, 2009
    Cassadaga New york
    war wagon is right dam plastic rocker arm retainers
     
  10. vstech

    vstech Member

    104
    0
    Sep 24, 2009
    Charlotte, NC
    plastic rocker buttons...
    classic symptoms.
     
  11. or broken valve
     
  12. sctrailrider

    sctrailrider Do it Your self, Feel good about it

    817
    41
    Jan 15, 2012
    If you could find a set of the old style rocker arms you would be better of with them, no buttons.....
     
  13. john65td

    john65td Addicted to boost

    323
    0
    Jun 9, 2009
    Cassadaga New york
    i know, when i replaced my friends motor we used the old style arms, i haven't come across another set. well all 16 buttons are replaced and i also pulled and tested injectors, there not original so milage is unknown but all were 2000psi to 2200psi so i feel comfortable with that. now if i could just find a good turbo, mine is leaking just a bit
     
  14. vstech

    vstech Member

    104
    0
    Sep 24, 2009
    Charlotte, NC
    last issue of Diesel Power mag had an add for roller rockers on a shaft... no idea what they cost though...
     
  15. sctrailrider

    sctrailrider Do it Your self, Feel good about it

    817
    41
    Jan 15, 2012
    700$ + I think....
     

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