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Weird Noise - What could it be?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by openroad, Feb 26, 2015.

  1. Feb 26, 2015 at 7:48 PM
    #1
    openroad

    openroad [OP] Well-Known Member

    Joined:
    Jan 1, 2015
    Member:
    #145368
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    Male
    Ohio
    Vehicle:
    2015 Tacoma 2.7
    Cruise control, rear view camera.
    My 4wd 4 cyl MT 2015 makes an interesting noise a few seconds after I start driving after a cold start. (It's cold where I live now!) It's a "choom" kind of a hydraulic noise that lasts only a second.

    I am really curious what that could be. Seem to do it every time!

    Thanks for any ideas.
     
  2. Feb 26, 2015 at 9:02 PM
    #2
    nd4spdbh

    nd4spdbh Well-Known Member

    Joined:
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    SoCal
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    13 DCSB TRD OR v6 Auto
    smog air pump more than likely.

    Essentially pumps fresh air into the exhaust to aid in catalytic processes. During cold starts it seems to do a full speed run for a startup test.
     
  3. Feb 27, 2015 at 7:06 PM
    #3
    openroad

    openroad [OP] Well-Known Member

    Joined:
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    Member:
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    Messages:
    55
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    Male
    Ohio
    Vehicle:
    2015 Tacoma 2.7
    Cruise control, rear view camera.
    thanks
     
  4. Feb 27, 2015 at 7:09 PM
    #4
    QChawks

    QChawks Well-Known Member

    Joined:
    Jan 18, 2015
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    Davenport, IA
    Vehicle:
    2009 TRD Sport DCLB
    My 09 does the same thing
     

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