Rotational noise in engine bank (firewall side) '95 SE - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-25-2007, 03:03 PM   #1
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Default Rotational noise in engine bank (firewall side) '95 SE

All:

Last night driving home heard a noise in enigne. Car was idling at a stop light and the dash lights went dimmer. Initally thought maybe a alternator, but have good voltage. Belt is tight and not slipping, no miss in engine, just the noise, which increases or decreases with RPM'*.......I'm stumped.

Had a few guys listening to it too.......any thoughts?

Thanks,

-Jay
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Old 01-25-2007, 03:18 PM   #2
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I can't hear it from here very well. Can you describe the noise? Does it happen when cold? Warm? All the time? Just at idle?

Try removing your accessory belt to see if the noise goes away. You can run for a short period of time without your water pump (a minute should be enough to know if that fixes your problem).

Consider buying a $10 mechanic'* stethescope.
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Old 01-25-2007, 03:24 PM   #3
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The noise is there cold and warm although not as loud as it warms up. The same noise, but it increases and decreases with the RPM'*.

I had three techs look at it, all stumped so I wrote to the real experts here. Removing the belt is a good idea. Keep your ideas coming.
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Old 01-25-2007, 03:26 PM   #4
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What does the noise SOUND like. DESCRIBE it please.
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Old 01-25-2007, 03:38 PM   #5
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It'* a metallic noise. We initially thought is was a rocker type noise.
Someone else thought perhaps a rattle from the cat (which is less than a year old, high flow).

Lots of head scratching here. FYI, it doesn't appear to be related to the belt or even a belt noise, so the removal of it may be a mute point.
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Old 01-25-2007, 03:40 PM   #6
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Is it a tapping, knocking, clicking, squealing, or grinding noise??
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Old 01-25-2007, 03:41 PM   #7
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First of all, please put your year and model in your signature. It may be important.

Secondly, you're going to have to be ALOT more specific in your description. There are many different 'metallic' noises your car can make.

Can you answer the rest of the questions above?
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Old 01-25-2007, 03:43 PM   #8
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I'd say more of a tapping sound
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Old 01-25-2007, 03:54 PM   #9
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Quote:
I can't hear it from here very well. Can you describe the noise? Does it happen when cold? Warm? All the time? Just at idle?

Try removing your accessory belt to see if the noise goes away. You can run for a short period of time without your water pump (a minute should be enough to know if that fixes your problem).

Consider buying a $10 mechanic'* stethescope.

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Old 01-25-2007, 06:08 PM   #10
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What did it do when you pulled the belt? Did it still make noise? If not....

When the lights on the dash dimmed, the the voltage gage go down a little too?

If you have the volt gage, the it'* the N/A motor, which means you have the 105A alternator. Have you replaced the alternator since you have owned the car?

When an alternator starts to go out, it starts to make noise. Not a metal to metal noise though

Every moving piece on the motor is on the pass side.


Check your tensioner pulley. Mine went to crap the night I bought the car
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