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Engine brake stuck half way open or closed ????

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Barca, Jul 4, 2012.

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  1. Jul 4, 2012 #1
    Barca

    Barca Light Load Member

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    Im wondering can engine brake stuck half way open or closed. My truck started doing something strange. When i let of the gas to let it roll it starts slowing down almost like engine brake is on, i can not hear the engine brake but my truck slows down. Even pulling 45k is not gonna gain speed down smaller hill , it will some but it feels like something is holding it back. Its not the trailer cause it did it with few trailers. Brakes are good, no codes and no air leaks if i stay on gas truck pulls like it did before. Thanks
    2007 volvo 670 with isx 400hp
     
    Last edited: Jul 4, 2012
    Barca, Jul 4, 2012
    Barca, Jul 4, 2012
    #1
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  3. Jul 4, 2012 #2
    dorlia2

    dorlia2 Light Load Member

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    Make, Model, Engine?
     
    dorlia2, Jul 4, 2012
    dorlia2, Jul 4, 2012
    #2
  4. Jul 4, 2012 #3
    Superhauler

    Superhauler TEACHER OF MEN

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    read last line in post.
     
    Superhauler, Jul 4, 2012
    Superhauler, Jul 4, 2012
    #3
  5. Jul 4, 2012 #4
    25(2)+2

    25(2)+2 Trucker Forum STAFF Staff Member

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    If you are hearing the C-brake while this is occurring, that would mean the brake is being deployed. I don't know why. As soon as you release the throttle it starts slowing down, that would be right, too.

    Does it do it with the cruise control engaged and set?
     
    25(2)+2, Jul 4, 2012
    25(2)+2, Jul 4, 2012
    #4
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  7. Jul 4, 2012 #5
    Barca

    Barca Light Load Member

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    yup it does it with cruise control as well. it i set it at 65 as soon as it gains some speed it will slow it back to 65 ans stay there
     
    Barca, Jul 4, 2012
    Barca, Jul 4, 2012
    #5
  8. Jul 4, 2012 #6
    25(2)+2

    25(2)+2 Trucker Forum STAFF Staff Member

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    Try making sure the C-brake selector switch is off, and check with the brake levels set at different levels to see if it makes a difference.

    My truck won't use the Jake until 75 mph if the cruise control is set at any speed, but as soon as I turn the cruise off, the Jake will come on, but that is a Detroit in a Columbia.


    Is your truck a manual or an auto-shift?
     
    25(2)+2, Jul 4, 2012
    25(2)+2, Jul 4, 2012
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    Barca Thanks this.
  9. Jul 4, 2012 #7
    Barca

    Barca Light Load Member

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    Its a 9 speed manual . Before this problem started my engine brake would come on cruise control only if i went 5mph over what i set cruise control on. Could you please explain in more details how to check c-brake to be honest with you i dont know too much about it., thanks
     
    Barca, Jul 4, 2012
    Barca, Jul 4, 2012
    #7
  10. Jul 4, 2012 #8
    25(2)+2

    25(2)+2 Trucker Forum STAFF Staff Member

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    You need someone familiar with a Volvo, my experience with an ISX in a Columbia was with a 2000.

    I'm thinking the Volvo has 2 switches, an on/off and level, probably 3 levels. That is the way the older Volvo was if I remember right.
     
    25(2)+2, Jul 4, 2012
    25(2)+2, Jul 4, 2012
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    Barca Thanks this.
  11. Jul 4, 2012 #9
    Barca

    Barca Light Load Member

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    Thanks a lot i appreciate your help.
     
    Barca, Jul 4, 2012
    Barca, Jul 4, 2012
    #9
  12. Jul 4, 2012 #10
    sparkn

    sparkn Light Load Member

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    Back pressure in your exhaust will do essentially what you are describing. In fact, exhaust brakes (NOT jake brakes) are just that, a valve that introduces back pressure in the exhaust system (oversimplified, but that's it in a nutshell). If your exhaust is restricted it would also cause loss of power and possibly black smoke, both getting worse as the problem gets worse.

    If the jake (the c brake is a compression brake by Jacobs built specifically for Cummins engines) was on all the time it would be highly pronounced at low speed with no mistaking that it was on even at it's lowest setting.
     
    sparkn, Jul 4, 2012
    sparkn, Jul 4, 2012
    #10
    Barca Thanks this.
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