Idles fine, very weak acceleration, backfires, metal clanking, loud whining noise

2000 TOYOTA SIENNA
220,000 MILES • 3.0L • V6 • 2WD • AUTOMATIC
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MIKE5545
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Had my motor mounts replaced by neighbor. Afterward it idles fine but now has very weak acceleration, it backfires, there's a metal clanking noise coming from underneath, and after 2 or 3 minutes of driving it starts making a very loud whining noise until I come to a complete stop.
Jan 17, 2021 at 9:54 AM
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MIKE5545
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Other information is no check engine light, replaced plug wires and coils, replaced drivers front axle, and the whining noise will also start if the van is just idling also.

Trying to get it running decent to give to my 18 year old who just started college here in town.

Thank you
Jan 17, 2021 at 10:03 AM
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ASEMASTER6371
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Good morning,

The noise and backfiring could be something with the valve train has failed.

https://www.2carpros.com/articles/engine-noises

https://www.2carpros.com/articles/engine-backfires-while-running

Can you take a video for me to hear the noise?

Roy
Jan 17, 2021 at 11:13 AM
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MIKE5545
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Thank you Roy. yes, I'll get one posted after work this afternoon. (I'm in EST)

Mike
Jan 18, 2021 at 6:36 AM
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ASEMASTER6371
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You are welcome.

I will be here.

Roy
Jan 18, 2021 at 6:38 AM
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MIKE5545
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Sorry for the delay in uploading the video but here it is.

Thank you
Jan 20, 2021 at 8:09 AM
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ASEMASTER6371
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Thank you.

This sounds like a bearing from either the serpentine belt or timing belt. One of the pulley bearings may be making the noise.

https://www.2carpros.com/articles/vehicle-scraping-noise

I would remove the drive belt and see if the noise is still there.

https://www.2carpros.com/articles/serpentine-belt-tensioner-replacement

https://www.2carpros.com/articles/replace-serpentine-belt

Roy
Jan 21, 2021 at 5:26 AM
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MIKE5545
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Thank you. Will get a chance this w/e to take a look. Any idea on the weak acceleration?
Jan 22, 2021 at 10:17 AM
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ASEMASTER6371
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ASEMASTER6371
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Did you respond? I got an email but nothing came through.

Roy
Jan 23, 2021 at 5:04 PM
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MIKE5545
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Hi Roy. The email wasn't me, been very busy this week, but thank you for your help. Hopefully this week I can get a few hours to look into it.
Jan 24, 2021 at 8:22 AM
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ASEMASTER6371
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You are welcome.

Roy
Jan 24, 2021 at 8:26 AM