Bump/Thump/Engine note change at 1200 RPM

Discussion in '6.0L Powerstroke Diesels' started by Cruiseomatic, Jan 14, 2018.

  1. Cruiseomatic

    Cruiseomatic Defining Insanity

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    When I have the engine at a high idle, It will randomly thump/bump and it is noticeable by just sitting in the truck. When it does it, The engine note also changes. Same at low idle but not as often.
    Sounds like its coming from the lower right side but with manual HVAC off which I'm having an issue with the a/c still on with controls on heat, It does it.
    No MIL or drivability issues at this time. I do have a strong exhaust smell when coming to a stop while driving and occasionally parked if windows open and no wind.
    Any ideas?
     
  2. Dsl_Dog_Treat

    Dsl_Dog_Treat I lost my face to the jaws of a poodle Staff Member

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    Any means to do a cylinder contribution test? Got something going on somewhere but not bad enough to set the cel.
    For the exhaust smell, inspect the up pipe bellows or firewall for soot marks. The up pipe bellows tend to crack.
     

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