387 engine brake

Discussion in 'Peterbilt Forum' started by Peterbiltmike, Jan 8, 2012.

  1. Peterbiltmike

    Peterbiltmike Bobtail Member

    4
    1
    Jan 8, 2012
    Gadsden,Al
    0
    I just bought an 05 387 when I use the engine brake it vibrates the entire truck and doesn't seem to be working at its full potiental
     
  2. 123456

    123456 Road Train Member

    10,551
    5,667
    Oct 22, 2010
    32179
    0
    hemi, or V-8 ......?
     
  3. Peterbiltmike

    Peterbiltmike Bobtail Member

    4
    1
    Jan 8, 2012
    Gadsden,Al
    0
    Neither it's an ISX Cummins
     
    123456 Thanks this.
  4. CondoCruiser

    CondoCruiser The Legend

    19,727
    18,584
    Apr 18, 2010
    Tennessee
    0
    If it's vibrating, possibly one of the cam solenoids is bad. Time to go to the shop!

    Does it make any difference changing the stages?
     
    Peterbiltmike Thanks this.
  5. Peterbiltmike

    Peterbiltmike Bobtail Member

    4
    1
    Jan 8, 2012
    Gadsden,Al
    0
    No it does not change anything
     
  6. Hardlyevr

    Hardlyevr Road Train Member

    3,233
    2,450
    Jul 30, 2009
    Gardners,PA
    0
    if changing the stages does not make a difference, it might be time to look at engine mounts too, or it could be in the cylinders that come on at the lowest setting, and are also on at all the higher ones too.
     
    Peterbiltmike Thanks this.
  • Draft saved Draft deleted