C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

1990 Beeping Noise when driving

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Old Dec 15, 2007 | 10:41 AM
  #1  
deh159's Avatar
deh159
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Default 1990 Beeping Noise when driving

Hi there,

I have a 1990 which seems to be running fine, the problem I am having is that when driving I get a long high pitched beeping tone coming from somewhere in the cabin. This only happens when i accelerate, if I am gentle with the power then it stops but when I accelerate again it starts. Is this some kind of warning tone? I have used the paperclip to check for any codes and there aren't any.

Anyone know what this is?

Thanks in advance
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Old Dec 15, 2007 | 10:46 AM
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ragged claws
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Originally Posted by deh159
Hi there,

I have a 1990 which seems to be running fine, the problem I am having is that when driving I get a long high pitched beeping tone coming from somewhere in the cabin. This only happens when i accelerate, if I am gentle with the power then it stops but when I accelerate again it starts. Is this some kind of warning tone? I have used the paperclip to check for any codes and there aren't any.

Anyone know what this is?

Thanks in advance


schizophrenia?
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Old Dec 15, 2007 | 11:45 AM
  #3  
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RandyJ75
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From: Mt Laurel NJ
St. Jude Donor '06-'07
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Alternator going bad? Throw out bearing?

Sounds like some kind of a bearing going bad.

Could also be the bearing in the fan going bad...

Last edited by RandyJ75; Dec 16, 2007 at 09:22 AM.
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Old Dec 15, 2007 | 11:49 AM
  #4  
OBSESHON Mark's Avatar
OBSESHON Mark
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From: Kingsville Ontario Canada
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I had a similar problem only after driving for a while with the radio on.
Turned out to be the factory Bose amp going bad.
Had the amp rebuild and has never happened again.
Good luck
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Old Dec 15, 2007 | 12:19 PM
  #5  
Digital Disaster's Avatar
Digital Disaster
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From: Phoenix Arizona
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Originally Posted by 90 TB Ragtop
I had a similar problem only after driving for a while with the radio on.
Turned out to be the factory Bose amp going bad.
Had the amp rebuild and has never happened again.
Good luck
I bet he's right - Bose amp meltdown
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Old Dec 15, 2007 | 01:39 PM
  #6  
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deh159
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Thanks for the replies

Its definately an electronic beep just like the short beep when you first turn on the ignition. The original bose radio has been replaced so dont think it could be that.

When i got home tonight i turned the engine off but the ac fans kept going, started up again and made sure the panel was set to off but still the same thing the fans kept blowing out air through the vents even though the engine was off and i had removed the key. Had to take the fuse out to stop it.

Seems like some weird electrical problems here.
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Old Dec 16, 2007 | 02:08 AM
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From: Obama=death for America
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deh159:

The first thing you need to do is fill out your profile. This is necessary because it helps us determine your car's woes; we will see what year your car is, any mods, etc. You should also include this info. with your post so we don't need to do the legwork, but it should be there anyway. As already mentioned, it sounds like a bearing is going. Most of the time, it's the alternator and is commonly known as, "alternator whine." The more or faster you accelerate, the higher the pitch becomes. As you slow down, the sound decreases.
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