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Noise under hood at cold start up

Discussion in 'New Members' started by Geno4x4, Dec 1, 2020.

  1. Dec 1, 2020 at 8:35 AM
    #1
    Geno4x4

    #1
    Geno4x4 [OP] New Member

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    I own a 2012 Tacoma. Never had any issues with it yet. What could cause a under hood noise for appr. 30 seconds ONLY at first start-up each day. Sometimes at end of work day. Otherwise, no noise except when it's cooled down. Sounds like some small motor slowing down when the noise stops. Thanks.
     
    Geno4x4, Dec 1, 2020
    #1
    buckhuntin-tacoma, Hobbs and Bigdaddy4760 like this.
  2. Dec 1, 2020 at 9:34 AM
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    Black DOG Lila

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    Black DOG Lila Well-Known Member

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    Black DOG Lila, Dec 1, 2020
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    buckhuntin-tacoma, mtip, Hobbs and 1 other person like this.
  3. Dec 1, 2020 at 1:23 PM
    #3
    Bigdaddy4760

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    Bigdaddy4760 Well traveled Older Than Dirt

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    Bigdaddy4760, Dec 1, 2020
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    buckhuntin-tacoma and Hobbs like this.
  4. Dec 1, 2020 at 1:25 PM
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    Hobbs

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    Hobbs Anti-Lander from way back…

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    Yep…
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    Hobbs, Dec 1, 2020
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    buckhuntin-tacoma likes this.
  5. Dec 1, 2020 at 1:32 PM
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    Hooligans

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    Hooligans Well-Known Member

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    John
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    Still thinking about it.
    Hi Geno. There’s an air pump under the hood. I don’t know a lot about it but that’s likely what you hear.
     
    Hooligans, Dec 1, 2020
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    buckhuntin-tacoma likes this.
  6. Dec 1, 2020 at 2:22 PM
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    buckhuntin-tacoma

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    buckhuntin-tacoma Shed hunter

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    buckhuntin-tacoma, Dec 1, 2020
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  7. Dec 1, 2020 at 2:26 PM
    #7
    tcjacado

    #7
    tcjacado Well-Known Member

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    Welcome to TW.
    Check the serpentine belt and all the pulleys and wheels it wraps around.
     
    tcjacado, Dec 1, 2020
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  8. Dec 2, 2020 at 4:45 PM
    #8
    boogie3478

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    boogie3478 Well-Known Member

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    Welcome to TW! Need more info on the noise.
     
    boogie3478, Dec 2, 2020
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  9. Dec 2, 2020 at 4:48 PM
    #9
    TacoTyusday

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    TacoTyusday Well-Known Member

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    I think I know what you're talking about, as I have heard a noise as well upon startup that goes away after about 15-20 seconds. sounds like a whistling/whirring noise. I always figured, like stated above, it was the secondary air pump, and kinda just brushed it off.

    watching in case someone knows more about it/it's something else.
     
    TacoTyusday, Dec 2, 2020
    #9
  10. Dec 2, 2020 at 4:48 PM
    #10
    Steves104x4

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    Steves104x4 Well-Known Member

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    Steves104x4, Dec 2, 2020
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