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High pitched whistle

Discussion in 'General Discussions' started by band nerd, Jun 10, 2021 at 4:15 PM.

  1. band nerd

    band nerd Junior Member

    Age:
    58
    Posts:
    16
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    8
    Joined:
    Feb 15, 2020
    Location:
    San Antonio
    Ram Year:
    2014
    Engine:
    Cummins 6.7
    2014 2500 Cummins, stock, 199,500 miles .
    Going down the road under normal load I get a slight high-pitched whistling sound . If I turn my head I don’t hear it . It also goes away if I let off the accelerator . it is not speed-related . Turbo and DEF pump were replaced a little over a year ago .
    Yeah, I know, just keep my head turned .
    Thoughts?
     
  2. chri5k

    chri5k Senior Member Supporting Member

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    Joined:
    May 24, 2019
    Location:
    USA
    Ram Year:
    2016
    Engine:
    Diesel
    I had something similar on my 2500 with 150K miles. It was not speed dependent but it was engine RPM dependent. In park it would make a faint high pitch sound in the direction of the dash / steering wheel when I got to 1400 RPM or so and go up from there. When I stepped on the brake or turned the wheel it would stop. This lead me to the power steering / brake booster hydraulic system. I set the engine idle control to raise the idle to where it made the noise and probed with a stethoscope. It was strongest at the fittings on the back of the pump. It was not bearing noise. The noise did carry through the lines to the ABS block. I think it is fluid squeezing through a valve somewhere in the pump. I might replace the fluid to see if that changes the pitch to where I can't hear it.
     

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