Engine Whistle Normal Or Not?
Thread Starter
Instructor
Joined: Jun 2006
Posts: 215
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From: Houston Texas
Engine Whistle Normal Or Not?
I just got a 02 Z with 27000mi, but when the engine idles i can hear a whistleing type of noise coming from the engine. When i accelerate the you cant hear it anymore, but when you let go and almost back to idle the nosie gets a bit louder, then back to a single tone. No codes or anything, just wanted to check if its normal, or not. 
Le Mans Master
Joined: Aug 2003
Posts: 9,298
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From: American Canyon Lethal Injection
Originally Posted by CodeName Z06
I just got a 02 Z with 27000mi, but when the engine idles i can hear a whistleing type of noise coming from the engine. When i accelerate the you cant hear it anymore, but when you let go and almost back to idle the nosie gets a bit louder, then back to a single tone. No codes or anything, just wanted to check if its normal, or not.
Advanced
Joined: Aug 2006
Posts: 92
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From: Sincity
That's funny because i just bought a 03 z06 with 26k miles an it does the same thing. I was wondering if it was in the drivetrain, maybe the clutch or the shifter. I'm a vette rookie so if my guesses sound silly, don't hate me.
Damon
Damon
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Advanced
Joined: Apr 2006
Posts: 78
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From: B.C.
This is funny. I just installed an LS6 intake on my 98 and it whistles a bit driving at lower RPM's. I was also wondering what it is and if it's a problem. I don't get any codes and the car runs as normal.
Thread Starter
Instructor
Joined: Jun 2006
Posts: 215
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From: Houston Texas
I did a search on z06vette.com and it seams to be some what normal since many people have it and no one sugested it caused any problems, i also read it gets worst when you install an air intake.
Until it causes a problem i am just going to have to live with it.
The cure is driveing at high rpms.
Until it causes a problem i am just going to have to live with it.
The cure is driveing at high rpms.
Advanced
Joined: Apr 2006
Posts: 78
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From: B.C.
thanks for the info. I have the hurricane intake, it seems like you can really hear the air flow since I installed the ls6 intake manifold. I'd like to get rid of the whistling though, it's quite annoying.
Pro
Joined: Feb 2004
Posts: 718
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From: barrie ontario
There is a small cavity where the throttle body meets the intake that could be causing the whistling.
Many people fill it with epoxy to try and eliminate the noise.
BTW I have a '98 with the LS6 in take also
Many people fill it with epoxy to try and eliminate the noise.
BTW I have a '98 with the LS6 in take also
Race Director
Joined: May 2000
Posts: 14,542
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Guys, guys, guys...........
Subject: Whistle Noise From Intake Manifold/Throttle Body (Replace Intake Manifold)
Source: Chevrolet Dealer Technical Service Bulletin
Number: 02-06-01-021
Models: 2001 Chevrolet Corvette with 5.7L Engine (VINs G, S -- RPOs LS1, LS6)
1999-2002 Chevrolet and GMC C/K Pickup and Utility Models (Avalanche, Silverado, Sierra, Tahoe, Suburban, Yukon, Yukon XL, Yukon Denali, Yukon Denali XL) with 4.8L, 5.3L or 6.0L Engine (VINs V, T, Z, N, U -- RPOs LR4, LM7, L59, LQ9, LQ4)
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).
Subject: Whistle Noise From Intake Manifold/Throttle Body (Replace Intake Manifold)
Source: Chevrolet Dealer Technical Service Bulletin
Number: 02-06-01-021
Models: 2001 Chevrolet Corvette with 5.7L Engine (VINs G, S -- RPOs LS1, LS6)
1999-2002 Chevrolet and GMC C/K Pickup and Utility Models (Avalanche, Silverado, Sierra, Tahoe, Suburban, Yukon, Yukon XL, Yukon Denali, Yukon Denali XL) with 4.8L, 5.3L or 6.0L Engine (VINs V, T, Z, N, U -- RPOs LR4, LM7, L59, LQ9, LQ4)
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).
Race Director
Joined: Aug 2000
Posts: 10,649
Likes: 31
From: Central Florida
Whistle is characteristic. Has no effect on the behavior or performance of the car. Both my 01 and 02 had a whister under certain conditions and both ran very well. J-Rod has a video posted of a 6600 launch, you can hear the whistle at idle.
Ranger
Ranger
