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Pre-EGR Cummins w/ high idle.

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Big John, Feb 27, 2011.

  1. Feb 27, 2011 #1
    Big John

    Big John Road Train Member

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    I just bought this truck a 2001 KW T800 with a ISX 475 and it is idling at 800 rpm. I think it is to high, I would like to set the idle with the cruise if I need to bump it up. What is the normal idle on this motor? Is 650 to low? I am going to run it by a dealer next week and have them set it.
     
    Big John, Feb 27, 2011
    Big John, Feb 27, 2011
    #1
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  3. Feb 27, 2011 #2
    gunner76

    gunner76 Medium Load Member

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    did you get a manual for the engine with the truck? If so it should say in there. On my N14 I was told to set the low idle around 650-700rpm. In the manual it says I need at least 10psi at low idle which is around 650 on my truck.
     
    gunner76, Feb 27, 2011
    gunner76, Feb 27, 2011
    #2
    Big John Thanks this.
  4. Feb 27, 2011 #3
    Gambi80

    Gambi80 Medium Load Member

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    Try with the cruise off and bumping the set/resume down.
     
    Gambi80, Feb 27, 2011
    Gambi80, Feb 27, 2011
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    Big John Thanks this.
  5. Feb 27, 2011 #4
    Big John

    Big John Road Train Member

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    I went back to the truck and messed with it and I guess I was trying to do it with it on. I tried it with the cruise off and it idle down to 600 and I bumped it back up and left it at 650. That Cummins is so much quieter then my old Acert Cat. Thanks Guys for the replies.
     
    Last edited: Feb 27, 2011
    Big John, Feb 27, 2011
    Big John, Feb 27, 2011
    #4
  7. Feb 27, 2011 #5
    25(2)+2

    25(2)+2 Trucker Forum STAFF Staff Member

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    It worked in the 2000 Columbia ISX I drove to set the idle up or down with the toggle and the cruise control off. It may be the way it's set up in the Kenworth or it may be a problem with the motor or switch.

    The manual said to idle it at 800 RPM as it was fast enough to be efficient and not damage the engine and slow enough to not use as much fuel. Fuel use in GPH is about half at 800 versus 1100 according to the manual.

    The FL/ISX could be set to idle from just above 500 RPM to full governed speed just by bumping the toggle up or down.
     
    25(2)+2, Feb 27, 2011
    25(2)+2, Feb 27, 2011
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    Big John Thanks this.
  8. Feb 28, 2011 #6
    AUSSIE DAVE

    AUSSIE DAVE Road Train Member

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    usally set between 700rpm and 900rpm to reduce chance of damage to bearings, etc
     
    AUSSIE DAVE, Feb 28, 2011
    AUSSIE DAVE, Feb 28, 2011
    #6
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