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high frequency clicking sound

Discussion in 'Gen 2 Prius Technical Discussion' started by gui, Jun 6, 2023.

  1. gui

    gui New Member

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    Hi everyone,

    The engine of my 2006 prius started doing some weird noise recently. It has a high frequency clicking sound. It's fairly loud. The sound disappears when on electric mode. There is no engine light on the dashboard. The oil was a little low so I added more and it still does the sound.
    I changed the coolant flow control valve recently, I am not sure if it's related.
    Would you be able to help diagnose this issue?

    Thank you for your help!
     
    #1 gui, Jun 6, 2023
  2. bisco

    bisco cookie crumbler

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    might be noisy tappets from the low oil situation. how many miles on her? can you post a recording of the sound?
     
    #2 bisco, Jun 7, 2023
  3. ChapmanF

    ChapmanF Senior Member

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    Any chance of posting a recording?
     
    #3 ChapmanF, Jun 7, 2023
  4. pasadena_commut

    pasadena_commut Senior Member

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    By "high frequency" do you mean the pitch of the clicks (like a sound above 4000 Hz) or that the rate is fast and the clicks are just, well, clicks.
     
    #4 pasadena_commut, Jun 7, 2023
  5. gui

    gui New Member

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    #5 gui, Jun 8, 2023
  6. bisco

    bisco cookie crumbler

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    wow! is everything good with the serpentine belt?
     
    #6 bisco, Jun 8, 2023
  7. gui

    gui New Member

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    How can you check if the serpentine belt is good? Does it need to be removed?
     
    #7 gui, Jun 8, 2023
  8. ChapmanF

    ChapmanF Senior Member

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    That's a very regular click that I would take to be mechanical, and it seems to be around ten a second, or around 600 a minute, or around half the crank RPM, so in the valve train.

    Excessive clearance between rocker and tappet at one valve maybe? Bad spring or sticking valve? Might not be too hard to spot with the valve cover off.
     
    #8 ChapmanF, Jun 9, 2023
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