387 engine brake

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

  1. Peterbiltmike

    Peterbiltmike Bobtail Member

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    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

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    hemi, or V-8 ......?
     
  3. Peterbiltmike

    Peterbiltmike Bobtail Member

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    Neither it's an ISX Cummins
     
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  4. CondoCruiser

    CondoCruiser The Legend

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    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?
     
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  5. Peterbiltmike

    Peterbiltmike Bobtail Member

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    No it does not change anything
     
  6. Hardlyevr

    Hardlyevr Road Train Member

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    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.
     
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