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Old 03-17-2020, 06:11 PM #1
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Help diagnosing squeal/chirp

Hi all,

Trying to diagnose a chirp that seems to be coming from my accessory belts.

Captured a video here and hoping yíall can help point me in the right direction.

Belts are tight and tensioned correctly, alternator was replaced recently. Timing belt and water pump replaced not long ago either.

My initial suspicion is an idler going bad but not sure what one or if thatís the case for sure

Video is linked belowStrange squeak 99 4Runner - Album on Imgur
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Old 03-17-2020, 10:20 PM #2
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When does the noise happen? At start up or other time
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Old 03-17-2020, 10:21 PM #3
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At idle once warmed up all the way.
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Old 03-17-2020, 10:53 PM #4
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Sound to me like a'pulley bearing going out or misaligned. Any work done on the engine recently? To me it seemed louder near the fan clutch pulley. take one belt off at a time and see if you can narrow it down.
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Old 03-17-2020, 10:55 PM #5
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Quote:
Originally Posted by ctoombs View Post
At idle once warmed up all the way.
These engines are really nice because they have a belt for each accessory, so you can easily troubleshoot the noise.

Just start removing the belts 1 by 1 until the noise goes away.

If you get all 3 belts off, and it's still there, you know it's something behind the timing cover.

Easy peasy!
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Old 03-17-2020, 11:13 PM #6
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Smile

A easier way is to use a spray bottle with windex start the engine spray each belt one at a time and listen if itís a pull-up noise it will quite down for a bearing a section of Heater hose may help locate the noise or as mentioned above remove each belt one at a time. Hand spin each item. The ac idler pulley can be repacked with grease in a pinch
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Old 03-18-2020, 08:05 PM #7
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Bit of an update: ran an errand today where I got fully up to temp, and lo and behold, zero noise.

Now the interesting factor here is itís 20 degrees warmer today (60) vs yesterday (35-40).

Gonna definitely get into it and see whatís causing the chirp, will report back once I get to the bottom of this.
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Old 03-18-2020, 08:59 PM #8
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Quote:
Originally Posted by ctoombs View Post
Bit of an update: ran an errand today where I got fully up to temp, and lo and behold, zero noise.

Now the interesting factor here is itís 20 degrees warmer today (60) vs yesterday (35-40).

Gonna definitely get into it and see whatís causing the chirp, will report back once I get to the bottom of this.
Please let us know what you found. There are so many threads where people give different kinds of advice, and OP never responds if they tried any of it, or if they even fixed the problem.
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