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Old 07-16-2024   #1
rosseich
 
Join Date: Dec 2023
Location: Minneapolis
Posts: 15
Question High Pitch Whine or Squeal at Start-Up

1995 ZR1 with 10,000 miles - all original. I'm hearing a high pitch whine or squeal at start-up and first few minutes until the engine is warm. The idler pulley was rebuilt by Marc, and all the other pulleys and components are original. The belt is also new.

I have removed the belt and manually spun the water pump, alternator, power steering pump and AC compressor. All sound/seem normal. Since it is only noticeable when the engine is running at 2000+ RPMs, how can I identify the source of the issue?

I would appreciate your thoughts/advice.

Thanks.
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Old 07-16-2024   #2
Mikey
 
Join Date: Jul 2020
Location: Nashville TN
Posts: 314
Default Re: High Pitch Whine or Squeal at Start-Up

Have someone else start the car while you listen. You can use an engine stethoscope to isolate noises at each accessory component bearing.
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Old 07-16-2024   #3
hotroddaddyo
 
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Join Date: Apr 2023
Location: Houston, TX
Posts: 187
Post Re: High Pitch Whine or Squeal at Start-Up

Was the noise before the new belt or after?
Is the new belt properly tensioned? Proper size belt.... (length, width, number of ribs)?
Trying spraying belt dressing on belt with engine running... careful!

Do you hear the noise when the engine is running without the belt?
Try another belt.

Any excess lateral play in pulley bearings, water pump shaft, etc.?

Last edited by hotroddaddyo; 07-16-2024 at 08:43 PM.
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Old 07-17-2024   #4
mlipmd
 
Join Date: Mar 2021
Location: Crawfordville, FL
Posts: 216
Default Re: High Pitch Whine or Squeal at Start-Up

Are you hearing an air whistle? Does that noise change or disappear if you increase the rpms slightly?
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Old 07-19-2024   #5
Young1
 
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Join Date: Sep 2016
Location: Ocala, FL
Posts: 889
Default Re: High Pitch Whine or Squeal at Start-Up

Is squeal with clutch engaged? Or clutch disengaged?
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