N14 missing at 1500 to 1600 RPM

Discussion in 'Trucks [ Eighteen Wheelers ]' started by AUSSIE DAVE, Sep 18, 2012.

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  1. Sep 18, 2012 #1
    AUSSIE DAVE

    AUSSIE DAVE Road Train Member

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    A friend of mine has a N14 that is missing at around 1500 to 1600 rpm. No fault codes as such, have checked all injectors and solinoids, engine position sensor, injector hold down clamp, but all is good. Any ideas ?
     
    AUSSIE DAVE, Sep 18, 2012
    AUSSIE DAVE, Sep 18, 2012
    #1
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  3. Sep 18, 2012 #2
    Daz

    Daz Bobtail Member

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    Broken injector spring.
     
    Daz, Sep 18, 2012
    Daz, Sep 18, 2012
    #2
    AUSSIE DAVE Thanks this.
  4. Sep 18, 2012 #3
    AUSSIE DAVE

    AUSSIE DAVE Road Train Member

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    Thanks I'll check that
     
    AUSSIE DAVE, Sep 18, 2012
    AUSSIE DAVE, Sep 18, 2012
    #3
  5. Sep 18, 2012 #4
    Daz

    Daz Bobtail Member

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    Use an infra-red thermometer on the exhaust manifold to see which pot is colder after making it miss for a while, if that's sounds too expensive a screwdriver makes a great stethoscope.
     
    Daz, Sep 18, 2012
    Daz, Sep 18, 2012
    #4
    AUSSIE DAVE Thanks this.
  7. Sep 18, 2012 #5
    bender

    bender Road Train Member

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    Just to add so that it isn't overlooked; The injector plunger is two pieces that are swedged together with a rubber sleeve between the two parts at the swedge. The swedge joint can become loose and allow the plunger to slip in and out causing intermittent misfire. This sometimes causes a ticking/tapping noise when it gets bad enough, but will usually cause a dead miss at that point.
     
    bender, Sep 18, 2012
    bender, Sep 18, 2012
    #5
    AUSSIE DAVE Thanks this.
  8. Sep 18, 2012 #6
    AUSSIE DAVE

    AUSSIE DAVE Road Train Member

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    Thanks bender, great info

     
    AUSSIE DAVE, Sep 18, 2012
    AUSSIE DAVE, Sep 18, 2012
    #6
  9. Sep 18, 2012 #7
    AUSSIE DAVE

    AUSSIE DAVE Road Train Member

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    Feb 21, 2010
    OZ - Brisbane
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    Thanks, it's a intermediate miss, don't think it will show up with infra red thermo, . But will check it out.
     
    AUSSIE DAVE, Sep 18, 2012
    AUSSIE DAVE, Sep 18, 2012
    #7
  10. Sep 19, 2012 #8
    Daz

    Daz Bobtail Member

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    My Fleet Liner did exactly that. Took ages to demonstrate to the workshop boys, it normally did it after a bit of lugging or sometimes from a cold start.
     
    Daz, Sep 19, 2012
    Daz, Sep 19, 2012
    #8
  11. Sep 21, 2012 #9
    Offroadjack

    Offroadjack Light Load Member

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    Jun 19, 2012
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    Did u ever figure it out?
     
    Offroadjack, Sep 21, 2012
    Offroadjack, Sep 21, 2012
    #9
  12. Sep 21, 2012 #10
    Offroadjack

    Offroadjack Light Load Member

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    Mine did that when a injector got weak and then again when it was out of
    Adjustment
     
    Offroadjack, Sep 21, 2012
    Offroadjack, Sep 21, 2012
    #10
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