Truck idle and using the air brakes

Discussion in 'Questions From New Drivers' started by paccarmike, Jun 4, 2021.

  1. paccarmike

    paccarmike Bobtail Member

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    Jul 9, 2014
    Washington
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    I do heavy haul so I'm permitted up to 105,500 here in the PNW. Slight decline meaning just enough to get the water to drain down to the other side of the lot. I'm going to buy something small that can hold down the throttle.
     
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  3. abyliks

    abyliks Road Train Member

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    Bumping the idle with the cruise to 8-900 should be done any time you leave the truck to begin with, that may bypass the idle shut down

    if it does not, there’s plenty of other companies out there
     
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  4. Long FLD

    Long FLD Road Train Member

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    If you idle up a new truck it confuses the sensors and will pump too much def through and will eventually gum up the dpf.
     
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  5. special-k

    special-k Road Train Member

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    The trailer brakes will be fine holding the unit in place. If you don't trust them set the trailer brakes and try to pull the trailer with the truck. If it moves without skidding tires take it to a shop. I don't anyone who engages all the brakes all the time regardless of the slope they park on.
     
  6. AModelCat

    AModelCat Road Train Member

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    DEF gets injected after the DPF.
     
  7. Farmerbob1

    Farmerbob1 Road Train Member

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    Hrm. Based on where my DEF injectors are, and where my DPF filters are, that makes little sense.

    If I am right, there is BOTH a injector before the filters, and a flat pan holding more DEF inside the DPF filter assembly box.
     
  8. Long FLD

    Long FLD Road Train Member

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    Idk. Just what I was told. If I idle mine up to 8-900 and go to bed I have to regen before I start driving but if I leave it at low idle then I don’t. I was told it was because idling it up makes the computer think it needs more def.
     
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  9. AModelCat

    AModelCat Road Train Member

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    There's actually 3 different catalysts in the aftertreatment. DEF is injected after the DPF and into the SCR. The DOC is first and is what gets dosed with fuel during a regen, which creates the heat needed to clean the DPF.
     
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  10. Farmerbob1

    Farmerbob1 Road Train Member

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    At low exhaust temperatures, your buildup in the filters is based on the volume of exhaust passing through the filters. My truck slow idles at 600ish RPM, and I will guess yours does too.

    800 to 900 RPM with no load is not going to make enough heat to clean filters, so you are pushing 33 to 50% more exhaust through the filters, generating 33 to 50% more gunk overnight.
     
  11. Harry Flashman

    Harry Flashman Medium Load Member

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    The cruise control trick hasn’t worked on any truck I’ve driven in the past 4 years. Prior, I used to use it, but the truck manufacturers got wise to it.
     
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