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

Tiny
MIKE5545
  • MEMBER
  • 2000 TOYOTA SIENNA
  • 3.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 220,000 MILES
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.
Sunday, January 17th, 2021 AT 9:54 AM

11 Replies

Tiny
MIKE5545
  • MEMBER
  • 6 POSTS
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
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Sunday, January 17th, 2021 AT 10:03 AM
Tiny
ASEMASTER6371
  • MECHANIC
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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
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Sunday, January 17th, 2021 AT 11:13 AM
Tiny
MIKE5545
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Thank you Roy. Yes, I'll get one posted after work this afternoon. (I'm in EST)

Mike
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Monday, January 18th, 2021 AT 6:36 AM
Tiny
ASEMASTER6371
  • MECHANIC
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You are welcome.

I will be here.

Roy
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Monday, January 18th, 2021 AT 6:38 AM
Tiny
MIKE5545
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  • 6 POSTS
Sorry for the delay in uploading the video but here it is.

Thank you
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Wednesday, January 20th, 2021 AT 8:09 AM
Tiny
ASEMASTER6371
  • MECHANIC
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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
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Thursday, January 21st, 2021 AT 5:26 AM
Tiny
MIKE5545
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Thank you. Will get a chance this w/e to take a look. Any idea on the weak acceleration?
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Friday, January 22nd, 2021 AT 10:17 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Low power could be from low compression, timing belt worn or cat converter being clogged.

https://www.2carpros.com/articles/engine-has-low-power-output

https://www.2carpros.com/articles/how-to-test-engine-compression

https://www.2carpros.com/articles/how-a-timing-belt-works

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter
Roy
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Friday, January 22nd, 2021 AT 11:48 AM
Tiny
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Did you respond? I got an email but nothing came through.

Roy
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Saturday, January 23rd, 2021 AT 5:04 PM
Tiny
MIKE5545
  • MEMBER
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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.
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Sunday, January 24th, 2021 AT 8:22 AM
Tiny
ASEMASTER6371
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You are welcome.

Roy
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Sunday, January 24th, 2021 AT 8:26 AM

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