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

Whats my problem?

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Old Aug 29, 2007 | 05:52 PM
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Default Whats my problem?

There is a noise coming from the serpetine belt. but idk if its the belt or the wheels that are the problem. how do i find out? thanks
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Old Aug 29, 2007 | 06:07 PM
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Probably the idler pully. You can use a yard stick or something; put it to your ear, and CAREFULLY probe stationary areas of suspect items. With the motor running of course. It will amplify any noises.

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Old Aug 29, 2007 | 06:43 PM
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Typically idler or alternator.
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Old Aug 29, 2007 | 06:57 PM
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it a high pitched noise. sounds like scratching a record. i'll try that
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Old Aug 29, 2007 | 08:22 PM
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or a really high pitched whistle. Its your idler pulley. 40 bucks. I just changed mine.
Have it checked first with a mechanics stethoscope.
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Old Aug 29, 2007 | 09:30 PM
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yea i want to get that checked
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Old Aug 29, 2007 | 09:56 PM
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Originally Posted by Canam
or a really high pitched whistle. Its your idler pulley. 40 bucks. I just changed mine.
Have it checked first with a mechanics stethoscope.
can it still be the idler puller if the noise is still there while i'm driving. the noise is there at idle and when in drive
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Old Aug 29, 2007 | 10:40 PM
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Originally Posted by rolando4812
can it still be the idler puller if the noise is still there while i'm driving. the noise is there at idle and when in drive
Absolutely. The idler pulley has nothing to do with the car being at an idle. It is a pulley that helps to route the serpentine belt amoungst the various accesories. If bad, it would make noise at idle, in drive, or while cruising down the road.

Aaron
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Old Aug 29, 2007 | 10:44 PM
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oh wow. how much will a good one run me? can i get one at a local parts store?
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Old Aug 30, 2007 | 07:47 PM
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Originally Posted by Curveit
Probably the idler pully. You can use a yard stick or something; put it to your ear, and CAREFULLY probe stationary areas of suspect items. With the motor running of course. It will amplify any noises.

i drove the car today. the noise was there in the morning but wasn't there when i drove home. i tried this a few minutes ago and put the stick on areas of suspect, they all made a different sound. what should i be looking for?
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Old Aug 30, 2007 | 08:13 PM
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Could be the smog pump, replaced mine after the same type of noise and its gone.
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Old Aug 31, 2007 | 02:47 AM
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Originally Posted by rolando4812
i drove the car today. the noise was there in the morning but wasn't there when i drove home. i tried this a few minutes ago and put the stick on areas of suspect, they all made a different sound. what should i be looking for?
The one you're concerned with ... It should be apparent; as you said, they all sound different

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Old Aug 31, 2007 | 09:32 AM
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Originally Posted by JOESROAD
Could be the smog pump, replaced mine after the same type of noise and its gone.
My smog pump crapped out and make a weird noise around the belt area. I've also have had the bearings go bad on the tensioner idler pulley. You can buy just the idler tension pulley (with new bearings) from NAPA for around $20. The pulley is cheaper than the smog pump....a good place to start. Put a new "S" belt on the car is your unsure of how many miles are on it.
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Old Aug 31, 2007 | 01:20 PM
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.....if you are not sure exactly where the noise is coming from, remove the belt and start the car briefly...once you can determine that it is coming from the engine compartment, reaffix the belt......i had a similar noise on my 88 and i removed the idler pulley and replaced the BEARING and reinstalled it all in 20min.....if your belt appears to be worn (cracked at edges or rows worn) replace that.....any rotating mass can be the source.....
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Old Aug 31, 2007 | 01:23 PM
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Mine was the steering pump pulley, but you could actually see it wobbling all over the place.
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Old Aug 31, 2007 | 07:07 PM
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Originally Posted by JOESROAD
Could be the smog pump, replaced mine after the same type of noise and its gone.


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