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1999 Peterbilt 379 Speedometer Bounces

Discussion in 'Peterbilt Forum' started by rslivelyjr, Dec 8, 2023.

Page 2 of 2
  1. Dec 8, 2023 #11
    Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Yes.
     
    Big Road Skateboard, Dec 8, 2023
    Big Road Skateboard, Dec 8, 2023
    #11
    circle h Thanks this.
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  3. Dec 8, 2023 #12
    rslivelyjr

    rslivelyjr Bobtail Member

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    But my cruise will not idle up the truck when sitting still , that’s what we can’t figure out
     
    rslivelyjr, Dec 8, 2023
    rslivelyjr, Dec 8, 2023
    #12
  4. Dec 8, 2023 #13
    Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Yeah, because the pulse wheel is vibrating around and the ECM pics up on that. Start with my first reply. If you ain't gonna listen to those who reply, don't ask
     
    Big Road Skateboard, Dec 8, 2023
    Big Road Skateboard, Dec 8, 2023
    #13
    blairandgretchen and circle h Thank this.
  5. Dec 8, 2023 #14
    circle h

    circle h Light Load Member

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    Check the wiring from the speed sensor for abrasion or corrosion. If the problem started when the speedo was changed the problem might be with the speedo settings. The ecm gets input from everything and if something disagrees with everything else nothing works right.
     
    circle h, Dec 8, 2023
    circle h, Dec 8, 2023
    #14
  7. Dec 8, 2023 #15
    circle h

    circle h Light Load Member

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    And if no one has put a socket on the nut it hasn't been checked.
     
    circle h, Dec 8, 2023
    circle h, Dec 8, 2023
    #15
  8. Dec 8, 2023 #16
    rslivelyjr

    rslivelyjr Bobtail Member

    39
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    Mar 14, 2023
    0
    Hey brother I understand, and I will not problem here . I appreciate all your input . I will try and let you know what I find out thanks again
     
    rslivelyjr, Dec 8, 2023
    rslivelyjr, Dec 8, 2023
    #16
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