Whistle sound from engine compartment
Thread Starter
Le Mans Master
Joined: Aug 2004
Posts: 9,770
Likes: 0
From: Sahuarita AZ
Whistle sound from engine compartment
Hi all:
Lately, I've been hearing a whistle that seems to be coming from the engine compartment. I can only hear it when accelerating and the pitch of the whistle gets higher as the RMPs increase. The sound seems to be getting more apparent.
What could this be? I have a Halltech air intake, which I've heard can cause a sound like this. I also just got 4.10 gears installed, but I understand that the whine that gears can produce does NOT change pitch upon acceleration. Is that true?
Any other guesses?
Thanks.
Lately, I've been hearing a whistle that seems to be coming from the engine compartment. I can only hear it when accelerating and the pitch of the whistle gets higher as the RMPs increase. The sound seems to be getting more apparent.
What could this be? I have a Halltech air intake, which I've heard can cause a sound like this. I also just got 4.10 gears installed, but I understand that the whine that gears can produce does NOT change pitch upon acceleration. Is that true?
Any other guesses?
Thanks.
Race Director
Joined: Feb 2004
Posts: 11,651
Likes: 9
From: HOW FAST WAS I GOING OFFICER? Los Angeles Hating GM Dealership Service Dept.'s Since Sept. 2004
St. Jude Donor '04-'05-'06-'07
You sure Santa didn't sneak a turbo or something in? There's no big, round, shiney thing in there.... is there? 
Whatever it is... hopefully, it's not too bad.
Whatever it is... hopefully, it's not too bad.
Burning Brakes
Joined: May 2004
Posts: 770
Likes: 0
From: Nassau County New York
I have had this problem to and noticed it when i went under over-passes on the parkway. I to have the Halltech Stinger intake and have yet to track this problem down. That is the only mod if have on the car
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Racer
Joined: Nov 2005
Posts: 417
Likes: 0
From: Cleveland TN
Check under your passenger side engine cover.
Check the hose that is comming out of the intake on the passenger side (near the throttle body, but of course, on the intake.)
I had the same whistle sound and it was from that hose being loose. Its a vaccum hose and it'll whistle if it comes loose.
The car had the throttle body by-pass done to it when I bought it, so I guess it was from that?
Check the hose that is comming out of the intake on the passenger side (near the throttle body, but of course, on the intake.)
I had the same whistle sound and it was from that hose being loose. Its a vaccum hose and it'll whistle if it comes loose.
The car had the throttle body by-pass done to it when I bought it, so I guess it was from that?
Race Director
Joined: Jul 2001
Posts: 14,604
Likes: 3
From: Glendale, AZ
Originally Posted by MyVetteDream
You sure Santa didn't sneak a turbo or something in? There's no big, round, shiney thing in there.... is there?
this was my thoughts exactly - at least the whistling in mine can be pinpointed to a shiny round thing!
Drifting
Joined: Apr 2005
Posts: 1,509
Likes: 1
From: Lafayette CA
Is it that police officer you ran over last week? You're supposed to check under the hood after you run things over!!! 
The vacuum hose might be it. But a bad bearing could have similar characteristics . . . Alternator? . . . Power steering pump? You can check those with a mechanic's stethoscpoe (like a regular stethoscope, but with a solid metal rod that you put up against whatever part you're trying to hear the noise from). They are great for detecting mechanical noises coming from inside a component. Won't be much help finding a vacuum leak, though. They're available at most tool supply stores. They're relatively cheap - Under $20 I think. You'd probably want someone inside the car running the rpm up and down while you listen.
Good luck!
Dave
The vacuum hose might be it. But a bad bearing could have similar characteristics . . . Alternator? . . . Power steering pump? You can check those with a mechanic's stethoscpoe (like a regular stethoscope, but with a solid metal rod that you put up against whatever part you're trying to hear the noise from). They are great for detecting mechanical noises coming from inside a component. Won't be much help finding a vacuum leak, though. They're available at most tool supply stores. They're relatively cheap - Under $20 I think. You'd probably want someone inside the car running the rpm up and down while you listen.
Good luck!
Dave
Last edited by 1998 GTR; Dec 20, 2005 at 06:36 PM.
Burning Brakes
Joined: Jul 2004
Posts: 808
Likes: 0
From: San Diego CA
St. Jude Donor '05
Originally Posted by MyVetteDream
You sure Santa didn't sneak a turbo or something in? There's no big, round, shiney thing in there.... is there?
Whatever it is... hopefully, it's not too bad.
Whatever it is... hopefully, it's not too bad.
Yeah. Maybe you got a visit from the Spercharger Fairy...
Hope whatever the problem is it isn't too serious.
Race Director
Joined: Jul 2002
Posts: 11,522
Likes: 0
From: Sterling VA
Damn, I guess all the old guys on this forum must have gotten C6's. This problem/question is an old one. The C5 intake manifold whistles. That is all. There is a fix described somewhere. There's an internal blind passage that can be filled with epoxy or something like that which stops the whistle.
Le Mans Master
Joined: Aug 2003
Posts: 9,298
Likes: 4
From: American Canyon Lethal Injection
Rusty Rotors
For anyone who plans on replacing their OEM rotors, take this advise and get zinc coated ones. I painted the "hats" and fins between the rotors with a hi-temp exhaust manifold paint and still got rust. So ro save time and money I recommend getting zinc coated rotors. So I now have ordered a set of silver zinc coated rotors with powder coated hats (in black) coming from Rotorpros.com.
Here are pictures on my rotors now.
Front:
Rear:
Here are pictures on my rotors now.
Front:
Rear:
Cherish your Hopes...
Joined: Feb 2002
Posts: 13,074
Likes: 236
From: West Palm Beach FL
Cruise-In VII Veteran
St. Jude Donor '05-'06-'07
Originally Posted by MyVetteDream
You sure Santa didn't sneak a turbo or something in? There's no big, round, shiney thing in there.... is there?
Whatever it is... hopefully, it's not too bad.
Whatever it is... hopefully, it's not too bad.
..yeah ...mine used to whistle...and it was noticable....
When so many thought it could be a supercharger...
...I just installed one to fit the argument
...Santa nor any other fairy has touched StuzVette
Le Mans Master
Joined: Aug 2003
Posts: 9,298
Likes: 4
From: American Canyon Lethal Injection
Originally Posted by bierbelly
Damn, I guess all the old guys on this forum must have gotten C6's. This problem/question is an old one. The C5 intake manifold whistles. That is all. There is a fix described somewhere. There's an internal blind passage that can be filled with epoxy or something like that which stops the whistle.
to meThank you:
