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2012 Tacoma engine noise...WTF?!?!?

Discussion in 'Technical Chat' started by TacoTitan11, Apr 14, 2012.

  1. Apr 14, 2012 at 6:47 PM
    #1
    TacoTitan11

    TacoTitan11 [OP] Well-Known Member

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    so i was getting ready to mow the grass today and cranked up the truck to move it, when i cut it off, i hear this sound coming from under the hood like something was still spinning and making a whistling grinding noise. weird. it did it twice. then i cranked it up, let it run for two minutes, cut it off, sound goes away. hasnt come back. very strange. any suggestions? only have 1700 miles on her.:cool:
     
  2. Apr 14, 2012 at 7:04 PM
    #2
    TacoTitan11

    TacoTitan11 [OP] Well-Known Member

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  3. Apr 14, 2012 at 7:08 PM
    #3
    TacoTitan11

    TacoTitan11 [OP] Well-Known Member

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    good idea.
     
  4. Apr 14, 2012 at 7:08 PM
    #4
    babytruck

    babytruck Babytruck, babytruck...I've got a babytruck :)

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    Was your air conditioning set to "on"?
     
  5. Apr 14, 2012 at 7:09 PM
    #5
    OffroadToy

    OffroadToy This ain't Dodge City, and you ain't Bill Hickok

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    These trucks do some self test stuff after they're turned off...that might of been what you heard. I've never actually heard it...just remember reading about it in the owners manual.
     
  6. Apr 14, 2012 at 7:12 PM
    #6
    babytruck

    babytruck Babytruck, babytruck...I've got a babytruck :)

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    The self test is only when the key is turned to the on position I believe. He had shut the engine completely off.
     
  7. Apr 14, 2012 at 7:14 PM
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    TacoTitan11

    TacoTitan11 [OP] Well-Known Member

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    yeah, engine was shut off. it was weird. you guys remember the movie Predator? After the black dude unloads his gun on the Predator in the woods? after he runs out of ammo you hear his big gun still spinning...thats what it sounded like. haha
     
  8. Apr 14, 2012 at 7:16 PM
    #8
    TacoTitan11

    TacoTitan11 [OP] Well-Known Member

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    i agree, i think it is the fan.
     
  9. Apr 14, 2012 at 7:40 PM
    #9
    OffroadToy

    OffroadToy This ain't Dodge City, and you ain't Bill Hickok

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    Just read in my 07 owners manual that there's a leak detection pump that performs a fuel evaporation leakage check approximately five hours after the engine is turned off. Says it can be heard from underneth the "deck" for several minutes. Maybe that's what you heard? :confused:
     
  10. Apr 14, 2012 at 8:00 PM
    #10
    TacoTitan11

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    i dont think so....it was immediate
     
  11. Sep 16, 2012 at 10:05 PM
    #11
    maddiedaddy

    maddiedaddy Member

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    Did you ever figure this out or did it stop? My new 2013 Tacoma is doing that. Windup sound for couple seconds after shutting down.
     
  12. Sep 16, 2012 at 10:19 PM
    #12
    Spoonman

    Spoonman Granite Guru

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    Pop the hood and see what it is? Hood latch is on the left side of the drivers side knee bolster.
     
  13. Sep 16, 2012 at 10:19 PM
    #13
    BlazeTaco

    BlazeTaco Well-Known Member

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    Probably might be the new secondary air injection pump that the 2012 and later tacomas have its on the left side under the hood. It helps make the CAT's work better especially when you first start up and the engine is in open loop mode.
     
  14. Sep 17, 2012 at 6:56 AM
    #14
    maddiedaddy

    maddiedaddy Member

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    Thank you! If sure did sound 'on purpose' but just odd.
     
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