2012 dd15 low tone knocking at 1400-1500 rpm under load. Pdf deleted, getting better when engine at

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Reedbooks, Dec 9, 2019.

  1. Reedbooks

    Reedbooks Bobtail Member

    Sep 18, 2012
    Hear knocking at14-1500 rpm. Under load.
    When engine at normal operating temp sound better. Also a little vibration at 1500 rpm. Oil pressure good, no smoking no oil consumption. Any ideas?
  2. PE_Trans

    PE_Trans Road Train Member

    Did the knocking start right after the deletion? My truck (with DPF) made knocking noises when the fuel injectors went out, but in my case the knocking was when trying to start the engine, and I was not able to start the engine.
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