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Loud hissing sound

Discussion in '2nd Gen. Tacomas' started by thumpertx, Feb 28, 2013.

  1. thumpertx

    thumpertx [OP] Member

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    NEW Tacoma, 6 cyl, tow package. When the engine is turned off there is a lous hissing [air sucking] sound just after the motor dies. It comes from the engine compartment, passanger side, in front of the firewall from a part covered in a large black plastic cap.

    This vehicle was just driven home from the dealership, but they are closed.

    Any ideas
     
  2. Tacoma Mike

    Tacoma Mike 41 Year Toyota/Chrysler Tech/ASE Master

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    Normal . Forget About it.
     
  3. thumpertx

    thumpertx [OP] Member

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    Tacoma Mike... Thanks for the quick feedback. Can you tell me what causes the hissing or what it is a part of? Thanks again.
    thumpertx
     
  4. spithead051

    spithead051 Well-Known Member

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    It's something to do with the air pump for the emissions on the truck. They started that with the 2012 model year.
     
  5. neonlazer

    neonlazer Mechanically Goofy

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    Smog pump aka emissions thingy..sucks air out of something..lol
     
  6. Tacoma Mike

    Tacoma Mike 41 Year Toyota/Chrysler Tech/ASE Master

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    It's Uncle Sam Emmisions. They added air pumps and valveing so you hear the "Burp" on shutdown. We have had almost everyone say something about this on a test ride the first time they got in it. On my 2011 the big thing was the abs check on the first take off. It's always something. Wait till you walk by it at night and it starts making noise . Hehehehe.
     
  7. jw1983

    jw1983 Well-Known Member

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    It's totally normal. It weirded me out too when I got my 2013 because my 2011 Tacoma didn't do it.
     
  8. thumpertx

    thumpertx [OP] Member

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    Thanks for the assurance guys. I was a tad panicked when I first got home and turned the truck off.
     
  9. ckeene9

    ckeene9 Well-Known Member

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    Kind of like when my SC inter cooler pump randomly cycles.
     
  10. P9HST2

    P9HST2 Well-Known Member

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