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Buzzing/Humming/Whirring Noise

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Canard, Nov 2, 2024.

  1. Canard

    Canard Member

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    2010 Prius
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    Hi all,



    -2010, 420k km
    -Car is ON
    -Engine is warmed up but off

    My car has always made this buzzing/humming/whirring noise, but I don't ever remember it being this loud. It appears to be coming from the centre of the engine area, in the front third of the engine bay. I do not think it is the water pump and I do not think it is the inverter pump either. I am wondering if is some kind of proportional valve trying to position-keep... I know it has always made this noise but this seems louder than I recall. It could just be that it's a quiet day outside today but I am wondering what this is and if I should be concerned.

    There is almost a digital-sounding "chatter" over top of it as well if you listen very closely.

    Any ideas?
     
    #1 Canard, Nov 2, 2024
  2. ChapmanF

    ChapmanF Senior Member

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    The most prominent sound I hear in your video is the whiny b above middle c that comes from the throttle body, as this post further explains. I'm not sure if that's the sound you meant me to listen to.
     
    #2 ChapmanF, Nov 2, 2024
    Canard likes this.
  3. Canard

    Canard Member

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    Thank you very much; makes sense to me!
     
    #3 Canard, Nov 3, 2024
  4. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    You're spot-on with that, reached over to my piano to check.
     
    #4 Mendel Leisk, Nov 3, 2024
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