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Old 11-12-2019, 12:38 PM #1
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2000 T4R high pitched whining at 2K rpm

Hello all!

The weather got really cold recently and I immediately noticed a high pitched whining sound at 2K rpm's while driving. I think it might be weather related but maybe a coincidence? It'll warm up again in a couple of days so I'll see if it goes away.

I've included a video, please see the link at the end of the post.

Basically while driving, when the engine RPM's reach 2K i hear a high pitched whining sound from inside the vehicle. I rolled the window down and can hear it louder, outside the vehicle too.

To rule a few things out, I had the vehicle in park and got it up to 2K rpms and it didn't do it. I have to be driving. Also, while driving it does it on all gears, and OD. The sound goes away when the vehicle has been warmed up to 190F and/or I've been driving for 10 minutes or so. It does it in all modes, 2WD/AWD/4WD.

I did some research and was able to find a 98 4Runner with same issue and the comment from the OP said it turned out to be the exhaust but didn't specify. It does sound like some sort of resonance but I don't know where it might be, something touching the exhaust system? And why only when cold?

Any insight is much appreciated.

https://www.youtube.com/watch?v=ByPnHGO-uVQ&feature=youtu.be
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Old 11-24-2019, 09:04 PM #2
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Just a quick update, when the weather warmed up, it never whined, so it's definitely cold related but I still haven't found out where the whine is coming from. When the weather is around or below freezing, there will be a whine when 1st driving for a while until it warms up, then it disappears. Since my initial post, we've had above freezing days and it never whined once... Also happy to report, I took a trip to Kentucky and back with no issues, 1500 miles altogether so the vehicle is in good shape, I just wish I can figure out this mystery!
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Old 11-25-2019, 02:49 PM #3
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RandyBobandy is just really nice RandyBobandy is just really nice RandyBobandy is just really nice RandyBobandy is just really nice RandyBobandy is just really nice
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I had an exhaust leak that would make a similar sound, it’s possible that when it gets cold the metal contracts just enough to create a small leak. I just told people it was the turbo spooling up until I got around to replacing the exhaust
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