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Old 10-17-2007, 10:54 PM   #1
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Default Chirping noise from the hood

Hello, I am a new owner of a 2000 buick regal. I recently sent it to garage to get UIM and LIM fixed. After the repair, my car developed an annoying chirp sound after the car is heat up. The noise is almost constant during idling and slow driving. Upon fast acceleration, I am not sure if I still heard this sound.

I first suspect it is the drive belt that is cracked during the UIM work and let garage replace it. However, the noise is still there. I am so frustrated. Any suggestions are highly appreciated.

Thanks.
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Old 10-17-2007, 11:05 PM   #2
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best thing you can do is find out exactly where its coming from. maybe a video recording if you have a digital camera
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Old 10-17-2007, 11:24 PM   #3
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Is it a chirping, or a whistling? I also recommend recording a video if you have a camera that records sound. It is very hard to track down noises without a audio clip/video.
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Old 10-17-2007, 11:33 PM   #4
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Try spraying the center part of each pulley with some WD40 and see if one of them quiets down. If so, you've found your culprit. If not, we'll move on from there.

Edit - Another thought....remove the oil filler cap and see if the sound goes away. If it does, they may have forgotten the O ring for the PCV when they did the intake.
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Old 10-17-2007, 11:49 PM   #5
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Default Thanks, folks

I wish I found this site earlier although it is not dedicated to a old buick.

As Bonneville92V688 said, it is more like a whistle instead of chirp!

Archon, I will look at that stuff for sure. Good suggestion.


I will check my car per your recommendation tomorrow morning and update this thread.
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Old 10-18-2007, 08:16 AM   #6
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Roughly 90% all chirps and whistles after an UIM replacement come from a missing PCV o ring.

I'd be betting it'* the PCV.
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Old 10-18-2007, 01:02 PM   #7
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antibiotics you know there is a site dedicated to the regals. It is www.regalgs.org you are welcome to look over there and post. If you register there make sure you fill out all the info we have had problems with spam and bots.
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Old 10-18-2007, 02:32 PM   #8
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My vote goes to the o-ring...I forgot to replace mine when i replaced my PCV valve which is mounted in the UIM.

There should be one on the PCV valve itself, and one below in the hole.
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Old 10-18-2007, 04:20 PM   #9
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Default update, the O ring on the PCV valve was missing

Install the seal and the whistle noise has not come back yet after 20 min drive. Finger corssed.
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Old 10-18-2007, 04:33 PM   #10
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I thought my car ran smoother once the o-ring was in place. What is actually going on with pressure? Wouldn't it mechanically be more efficient if there was an equal amount of pressure in the valve covers?

I guess I fixed it but what does the PCV valve actually regulate the pressure in the valve covers?
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