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MBN Smoking

Discussion in 'Trucks [ Eighteen Wheelers ]' started by underpsi, Apr 18, 2011.

Page 1 of 4
  1. Apr 18, 2011 #1
    underpsi

    underpsi Road Train Member

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    Sep 18, 2008
    Toronto, Ont
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    We have an 04 MBN flashed to a 6NZ. Over the past month it has been smoking on start up and running a bit rough. I plugged it in and was cutting the injectors in and out and found that when I cut #4 it would stop most the smoke and almost not change the idle. So ordered an injector and I put it in yesterday but its still smoking. Same thing if I cut #4 it cuts most the smoke.

    Could it be a bad injector? Or am I missing something here? We put in a reman 10R 1000. I can't see it even being possible that an injector cup could be leaking because it still starts well.
     
    underpsi, Apr 18, 2011
    underpsi, Apr 18, 2011
    #1
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  3. Apr 18, 2011 #2
    REDD

    REDD The Legend

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    You want to start it off slow. Put it on Nicorette to start. After 6-8 weeks, if it is still smoking. Then you can try chantix. If that doesn't work, threaten to take it's allowance away! :biggrin_2559:


    Sorry. I know your serious. I was just trying to add a little humor
     
    REDD, Apr 18, 2011
    REDD, Apr 18, 2011
    #2
  4. Apr 18, 2011 #3
    Superhauler

    Superhauler TEACHER OF MEN

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    what color smoke,blueish white or black smoke?
     
    Superhauler, Apr 18, 2011
    Superhauler, Apr 18, 2011
    #3
  5. Apr 18, 2011 #4
    DDS

    DDS Medium Load Member

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    May 20, 2008
    Toronto
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    Sounds like low compression from a failed head gasket or broken upper ring.
     
    DDS, Apr 18, 2011
    DDS, Apr 18, 2011
    #4
  7. Apr 18, 2011 #5
    SHC

    SHC Spoiled Rotten Brat O/O

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    I was thinking maybe a bad o-ring or even a falty injector harness??
     
    SHC, Apr 18, 2011
    SHC, Apr 18, 2011
    #5
  8. Apr 18, 2011 #6
    Mr. Haney

    Mr. Haney Road Train Member

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    I'll bet ya a $100 it's a blown head gasket. After it warms up the smoke disappears because the extra heat in the engine is helping to burn the fuel in that cylinder. When it's cold there isn't enough heat to burn the fuel completely and you see white smoke.

    The liner sunk, you'll need to cut the counter bores and shim them all up to spec
     
    Mr. Haney, Apr 18, 2011
    Mr. Haney, Apr 18, 2011
    #6
    SHC Thanks this.
  9. Apr 19, 2011 #7
    LBZ

    LBZ Road Train Member

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    That would get him a out of service as DOT does not allow Chantix. His MBN may have an issue w/drowsiness.:biggrin_25525:

    ...just subscribing to the thread.
     
    LBZ, Apr 19, 2011
    LBZ, Apr 19, 2011
    #7
  10. Apr 19, 2011 #8
    underpsi

    underpsi Road Train Member

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    Sep 18, 2008
    Toronto, Ont
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    Excellent just what we need right now..... If it is a blown headgasket where would the compression from that cylinder be going?
     
    underpsi, Apr 19, 2011
    underpsi, Apr 19, 2011
    #8
  11. Apr 19, 2011 #9
    DDS

    DDS Medium Load Member

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    May 20, 2008
    Toronto
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    On the newer style heads with the relief cut between the cylinders, the headgasket leaks compression up in to the cavity.

    Got you pm, will call you today, I have been working out of the country for the last three months, back in the shop now.
     
    DDS, Apr 19, 2011
    DDS, Apr 19, 2011
    #9
    SHC Thanks this.
  12. Apr 21, 2011 #10
    forner

    forner Light Load Member

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    Nov 3, 2009
    okc ok
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    I have a same problem with my 04 kw mbn flashed to 7cz ...smokes on idle when I cut #4 off it stops I dont know should I change injector or head gasket
     
    forner, Apr 21, 2011
    forner, Apr 21, 2011
    #10
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