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Noticed a strange sound when I shut my truck off

Discussion in '2.5 Gen Tundras (2014-2021)' started by RLHOK, Nov 12, 2016.

  1. Nov 12, 2016 at 5:23 AM
    #1
    RLHOK

    RLHOK [OP] Keeper of the smoke.

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    Rich
    Oklahoma, just like the musical, but no singing
    Vehicle:
    2022 TRD Off Road 4Runner classic silver .
    Still rolling stock baby....
    Maybe it has done it all along, I don't know, but the last couple of days I have heard a buzz or humming sound is the best way to describe it.
    When I exit the truck I hear it, it only lasts a few seconds. Sound like maybe some sort of valve is opening or closing, not sure.

    Any ideas? Everything runs fine, no dash lights or codes.
     
  2. Nov 12, 2016 at 6:14 AM
    #2
    louscrw

    louscrw all jacked up on Mt. Dew

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    Lou
    Warner Robins, Ga
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    It is completely normal. I noticed on my truck too when I first got it, now, 1.5yrs later, it still does it. I forgot exactly what it is, but I asked the same thing on another forum. Hopefully somebody here will chime in. Sorry I couldn't be of much help other than to tell you it is normal.
     
    RLHOK [OP] and MotoTundra like this.
  3. Nov 12, 2016 at 6:26 AM
    #3
    ColoradoTJ

    ColoradoTJ Moderator Staff Member

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    I believe that is your AIPs cycling after shutdown to help with condensation accumulation.
     
    RLHOK [OP] likes this.
  4. Nov 12, 2016 at 9:42 AM
    #4
    CM-LENNY

    CM-LENNY No Complaints

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    PRO shocks, 37's Nitto G2's 4:88 diffs, few other mods
    It is all part off vacuum canisters and emissions. All normal.
     
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  5. Nov 20, 2016 at 1:35 PM
    #5
    jwm9289

    jwm9289 New Member

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    I noticed when the window tint guy had the key on for awhile, mine dine this.
     
  6. Nov 21, 2016 at 9:27 PM
    #6
    the_midwesterner

    the_midwesterner New Member

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    None, yet....
    Bingo. You are correct sir. Logic was introduced to prevent ice and condensation build-up that would kill the Air Injection Pumps.
     
    RLHOK [OP] and ColoradoTJ like this.
  7. Nov 21, 2016 at 11:35 PM
    #7
    MotoTundra

    MotoTundra The Ocho

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    -TRS Mini D2S Retrofit on TRD Pro Headlights (Apollo 2.0 Shrouds, 35w XB Ballasts, 5500k Bulbs) -Baja Designs Squadron R Sport Aux lights. -TRD Pro Grill -TRD Rear Sway Bar -BakFlip VP Tonneau w/BakBox -Dipped wheels & bumpers -Iron Cross HD steps -Undercover Swingcase -SunTek Paint Protection film -Tinted glass -Bedmat -OEM Towing Mirrors
    Yup, I'll admit until I found out what it was I spent a few minutes looking under my truck scratching my head.
     
    RLHOK [OP] likes this.

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