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Little Green Knob Under the Hood

Discussion in '1st Gen. Tacomas (1995-2004)' started by owyh33, Mar 14, 2025.

  1. Mar 14, 2025 at 7:41 AM
    #1
    owyh33

    #1
    owyh33 [OP] Member

    Joined:
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    Virginia
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    2001 Tacoma 2.4L
    Re: 2001 Tacoma with 2.4 liter engine and base/regular cab

    There is a little green knob under the hood (see the picture) and I need help understanding it, please. It says Evap Service Port and cautions to hand tighten only.

    What is it and what does it do?
    How is it used?

    Thank you,
    Richard - - -

    tacoma-engine-compartment.jpg
     
    owyh33, Mar 14, 2025
    #1
  2. Mar 14, 2025 at 7:48 AM
    #2
    rocknbil

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    rocknbil Well-Known Member

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    That is for the EVAP system, you've probably heard of the "smoke test." You'd apply pressure at that point to test for leaks in the evap system.
     
    rocknbil, Mar 14, 2025
    #2
    gasgasman likes this.

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