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Unknown Squeal - With Videos

Discussion in '1st Gen. Tacomas (1995-2004)' started by Yota03Taco, Aug 15, 2025 at 4:41 AM.

  1. Aug 15, 2025 at 4:41 AM
    #1
    Yota03Taco

    #1
    Yota03Taco [OP] Member

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    Been chasing an issue, quick rundown:

    • ⁠only squeals in drive, can hear the shift from park to drive in the videos
    • ⁠stops after around 40-45mph
    • ⁠all belts have been tightened
    • ⁠trans fluid changed twice (not flushed) it was clean
    • ⁠checked trans and motor mounts, while old there was not excessive movement on throttle in reverse or drive
    • ⁠no issues drive wise the last 2,000 miles with the sound, just wanting to figure out what it is
    • ⁠2001 Tacoma 4WD V6 200k miles

    Any help would be greatly appreciated!
     
    Yota03Taco, Aug 15, 2025 at 4:41 AM
    #1
  2. Aug 15, 2025 at 4:48 AM
    #2
    slater

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    slater Well-Known Member

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    I dont hear a squeak...
    I hear a whine....
    Get a mechanics stethoscope..
    Could be an alternator..
    possibly ac compressor, ps pump...
    ide start with alternator.
     
    slater, Aug 15, 2025 at 4:48 AM
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    Yota03Taco[OP] likes this.
  3. Aug 15, 2025 at 4:52 AM
    #3
    Yota03Taco

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    Yota03Taco [OP] Member

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    Squeal not squeak, you can hear the tone change when it goes from park to drive, the pitch changes.

    I checked the belts on the alternator, AC compressor and power steering last night, belts are new and tensioned properly.
     
    Yota03Taco, Aug 15, 2025 at 4:52 AM
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  4. Aug 15, 2025 at 5:04 AM
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    slater

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    slater Well-Known Member

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    could be a bearing whine from the actual component....
    see if tone changes by flashing your high beams....
    diodes go bad in alternators & cause a loud whine noise...
    or bad bearing on backside of alternator.
    im hearing a hum / whine
    not a squeak / squeal
    but, its a video, always different than in person.....
     
    slater, Aug 15, 2025 at 5:04 AM
    #4
    t0p_d0g and Yota03Taco[QUOTED][OP] like this.
  5. Aug 15, 2025 at 5:08 AM
    #5
    Yota03Taco

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    Yota03Taco [OP] Member

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    Sounds good, I will give it a once over, thank you.
     
    Yota03Taco, Aug 15, 2025 at 5:08 AM
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  6. Aug 15, 2025 at 6:26 AM
    #6
    slater

    #6
    slater Well-Known Member

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    $25 Lisle 52750 Stethoscope Kit
    https://www.amazon.com/Lisle-52750-...&hvlocphy=&hvtargid=pla-4583795269554955&th=1

    listen with both attachments till you truly isolate, especially cuz its subtle...
    I diagnosed engine noises for a living, its what I did...
    Someone telling you its this or that from the video & you just rolling the dice & replacing it with someones suggestion without them actually putting their ear on it, is considered throwing the parts cannon at it...
    first video, loud whine noise 30-34 seconds.... to me sounds like bad diodes in alternator, but need to scope it
     
    slater, Aug 15, 2025 at 6:26 AM
    #6
    Yota03Taco[QUOTED][OP] likes this.
  7. Aug 15, 2025 at 6:28 AM
    #7
    Yota03Taco

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    Yota03Taco [OP] Member

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    Oh yeah, will not be throwing any parts at it immediately, just trying the free things first.

    I will give this a shot as well. Thank you.
     
    Yota03Taco, Aug 15, 2025 at 6:28 AM
    #7

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