My vette is making a high pitch air sucking noise, I'm pretty sure its the throttle body and I know there is a Fix by GM but having problems finding out what it is on the forum. Please point me in the right direction. Thanks. I also looked in tech tips but no joy.

 

is it an '01? some of the early LS6 manifolds seemed to have this noise problem

if it's a noise, can't see it being a big deal

vacuum leak? ck the HVAC hose on the back of the manifold, replace the intake to head seals and t/b seal

are you near Orlando?

 

The car runs fine but sometimes it sounds like I'm running a super charger. I'm in jacksonvlle, I thought GM put a bulletin out on this problem, yes its a 01 cpe.

 

sounds like the early LS6 intake manifold whistle, never heard one myself, let it be IMHO, otherwise about 400 for a newer version intake

 

Old mechanic's trick:

Get a piece of tubing about three feet long, 3/4 to an inch in diameter. Put one end up to your ear and move the other end around the engine untill you locate EXACTLY he noise originate. That will git you a better idea of what you are faced with andhow to go about fixing it. !

Let us know what you find.

 

Is this what your talking about
Document ID# 888819
2001 Chevrolet Corvette


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Subject: Whistle Noise From Intake Manifold/Throttle Body (Replace Intake Manifold) #02-06-01-021 - (05/22/2002)



Models: 2001 Chevrolet Corvette

with 5.7L Engine (VINs G, S -- RPOs LS1, LS6)




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Condition
Some owners may comment on a whistle noise coming from either the intake manifold or the throttle body. The noise is most noticeable between 1100 and 2000 RPM.

Cause
This condition may be the result of airflow through the intake manifold.

Correction
Replace the intake manifold with the part listed below. Refer to the Intake Manifold Replacement procedure in the Engine Mechanical - 5.7L sub-section of the Service Manual (SI Document ID #642853).

Parts Information
Part Number
Description
Qty

88894339
Manifold, Intake
1


Parts are currently available from GMSPO.

Warranty Information
For vehicles repaired under warranty, use:

Labor Operation
Description
Labor Time

J0250
Manifold, Intake - Replace
Use Published Labor Time




GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
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© Copyright General Motors Corporation. All Rights Reserved.


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Document ID# 888819
2001 Chevrolet Corvette

 

I think my car may be making this sound also. I dont mind the sound but is there a problem that needs to be addressed or no?

 

Mine makes this whistling sound also as if i have a blower on the car. The funny thing is it only does it after i have been driving the car for a little while. I can't pinpoint where it is coming from. Almost sounds like its coming from the passengers side down towards the header?? Any other advice??
J