15 FL dd15

Discussion in 'Freightliner Forum' started by Keepontrucking2016, Oct 24, 2019.

  1. Keepontrucking2016

    Keepontrucking2016 Light Load Member

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    Does anyone know what this problem is and my rpm goes up and down a bit
     
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  3. mhyn

    mhyn Road Train Member

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    I don't see rpm goes up and down...
    but I hear something...
     
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  4. AModelCat

    AModelCat Road Train Member

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    Tach looks pretty steady to me. Not something I'd worry about.

    I too hear something though. Sounds like an exhaust leak. Maybe a miss? Kinda hard to tell.
     
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  5. Keepontrucking2016

    Keepontrucking2016 Light Load Member

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    here is a longer video it's hard to see on video rmp go up n down
     
  6. Keepontrucking2016

    Keepontrucking2016 Light Load Member

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    I forgot to mention once the engine warms up you can barely hear it n it plus does it a bit when im loaded climbing hill
     
  7. mhyn

    mhyn Road Train Member

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    nothing wrong with rpm. the gauge is not accurate plus there can be little up and down of rpm. its acceptable. do valve adjustment and use good fuel.
     
  8. Keepontrucking2016

    Keepontrucking2016 Light Load Member

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    I did valve adjustment about a year ago truck Has now 581k miles maybe I need to do it again. when I drive for a while my oil psi stays at around 19 20psi then slowly goes up to psi to 29 30 is that normal
     
  9. QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    Sounds like a stuck open exhaust valve. Take rocker cover off and inspect valve lash.
     
  10. Keepontrucking2016

    Keepontrucking2016 Light Load Member

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    I'm sorry I'm still learning where is that at
     
  11. SoCalRed

    SoCalRed Medium Load Member

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    If you don’t know where the valve cover is do not attempt to work on your truck. Take it to a mechanic.
     
    mhyn and QUALITYTRUCK Thank this.
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