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Loud whining noise coming from front engine casing

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Blazes101, May 23, 2025.

  1. May 23, 2025 at 4:44 PM
    #1
    Blazes101

    #1
    Blazes101 [OP] Member

    Joined:
    Jun 16, 2024
    Member:
    #451603
    Messages:
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    First Name:
    Jaxon
    Saskatchewan Canada
    Vehicle:
    2005 Tacoma TRD Off road
    Bilsteins 5100s, duratracks, homemade front bumper
    These last flew clicks there been a loud whining coming from my front casing deep towards the front. I suspect a bearing any thoughts?
     
    Blazes101, May 23, 2025
    #1
  2. May 23, 2025 at 4:53 PM
    #2
    Bishop84

    #2
    Bishop84 Well-Known Member

    Joined:
    Dec 17, 2015
    Member:
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    The 4.0 is famous for a misleading whining noise. Sometimes its the alternator, sometimes its the idler bearing right beside the alternator.

    A 20$ stethoscope will help isolate the noise.
     
    Bishop84, May 23, 2025
    #2
    TacoJoeBro likes this.
  3. May 23, 2025 at 4:58 PM
    #3
    TacoJoeBro

    #3
    TacoJoeBro Well-Known Member

    Joined:
    Jan 9, 2019
    Member:
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    Not Joe
    Midwest
    Vehicle:
    12 DCSB OffRoad
    6112/5160 Icon RXT JBA KO2
    Is it steady, or change with RPMs? Pop the belt off and start it. It’ll isolate the accessories from the engine. Then you could also spin the accessories by hand to see how everything spins and feels.
     
    TacoJoeBro, May 23, 2025
    #3

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