High-pitched whistle - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

 
LinkBack Thread Tools Display Modes
post #1 of 14 (permalink) Old Apr 13th, 11, 03:41 PM Thread Starter
Gold Lifetime Member
 
ZaCamaro69's Avatar
 
Join Date: Jun 2010
Location: Texas
Posts: 1,027
High-pitched whistle

I recently started noticing a really high-pitched whistle coming from... somewhere? It starts after the car warms up. When I pop the hood, it sounds like it's coming from the carb. But I used the ole mechanic's stethoscope -- thanks, Al! -- and I can't isolate the sound. Listened all around the headers, carb, intake, etc, but nada.

When I turn the power off, you can here the whistle kind of wind down and drop in pitch.

Ideas?

BTW, I found some old posts that indicate the sound's probably coming from carb. As suggested, I tried adjusting the idle, but it didn't change anything. If it matters, I'm running an Edlebrock 600 1406.
ZaCamaro69 is offline  
Sponsored Links
Advertisement
 
post #2 of 14 (permalink) Old Apr 13th, 11, 04:24 PM
Gold Lifetime Member
Steve
 
Steve69SS396's Avatar
 
Join Date: Nov 2005
Location: Modesto, CA
Posts: 2,372
Garage
Re: High-pitched whistle

What are you running for crankcase ventilation?

'69 Camaro - 429 SBC Dart Iron Eagle 9.325" block, Crower crank, Crower 6" billet rods, Ross pistons (10:1), Total Seal rings, AFR 245 heads, T&D steel body shaft rockers, Cloyes Timing set, custom ground 4-7 swap solid roller 274/286 @ .050" with .704" lift, Dart single plane, Holley Dominator EFI on E85, Injector Dynamics ID2000 Injectors, Stef's #1705R oil pan, F2 Procharger, Lemons 2" primary 4" collector, ATI 9" blower converter
Steve69SS396 is offline  
post #3 of 14 (permalink) Old Apr 13th, 11, 04:55 PM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 31,728
Garage
Re: High-pitched whistle

As Steve suggests, pull the dipstick as soon as you shut the engine off.
Whistle goes away, you need a vented cap on the opposite valve cover.

If the above doesn't give results, look into the vacuum control, cannister, hoses for the A/C and rally headlights mechanism, if equipped.

Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
'
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
CUBS - 2016 World Series Champions - Thank you, Joe Madden enjoy your next chapter.
Everett#2390 is offline  
 
post #4 of 14 (permalink) Old Apr 13th, 11, 06:36 PM Thread Starter
Gold Lifetime Member
 
ZaCamaro69's Avatar
 
Join Date: Jun 2010
Location: Texas
Posts: 1,027
Re: High-pitched whistle

Quote:
Originally Posted by Everett#2390 View Post
As Steve suggests, pull the dipstick as soon as you shut the engine off.
Whistle goes away, you need a vented cap on the opposite valve cover.
So THAT's what those plugs on the valve covers are for! Always wondered.

Will try that, then explore your suggestions if needed.

Thanks gents!
ZaCamaro69 is offline  
post #5 of 14 (permalink) Old Apr 13th, 11, 06:39 PM Thread Starter
Gold Lifetime Member
 
ZaCamaro69's Avatar
 
Join Date: Jun 2010
Location: Texas
Posts: 1,027
Re: High-pitched whistle

Quote:
Originally Posted by Steve69SS396 View Post
What are you running for crankcase ventilation?
Just to clarify, for certain, that big plug in the valve cover is what vents the crankcase? If that's the case, there's just a big plug there. Doesn't look like it has anything in it that could possibly breath.
ZaCamaro69 is offline  
post #6 of 14 (permalink) Old Apr 13th, 11, 07:05 PM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 31,728
Garage
Re: High-pitched whistle

Yes, the plug is just an oil fill cap for those valve covers having a tube connected to the OE air cleaner. Otherwise, you should run a vented cap.

Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
'
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
CUBS - 2016 World Series Champions - Thank you, Joe Madden enjoy your next chapter.
Everett#2390 is offline  
post #7 of 14 (permalink) Old Apr 13th, 11, 08:53 PM Thread Starter
Gold Lifetime Member
 
ZaCamaro69's Avatar
 
Join Date: Jun 2010
Location: Texas
Posts: 1,027
Re: High-pitched whistle

Quote:
Originally Posted by Everett#2390 View Post
Yes, the plug is just an oil fill cap for those valve covers having a tube connected to the OE air cleaner. Otherwise, you should run a vented cap.
Ah! In that case, yeah it's connected to the air cleaner... The air cleaner is kind of a rinky-dink set up though, i.e., I think it came off the sale rack at Wally World, and I haven't changed anything on it since purchasing from PO.
ZaCamaro69 is offline  
post #8 of 14 (permalink) Old Apr 13th, 11, 09:08 PM
Senior Tech
 
Join Date: Jan 2001
Location: Garden Ridge Tx. USA
Posts: 1,927
Re: High-pitched whistle

Start with the easy things like pulling the PVC valve out while it's running to see if the noise quits instead of pulling the freshly rebuilt TH400 and going through it again cause thats where the noise seems to be coming from....

Ron
The
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

An exercise in interchangeability on a Well optioned 67 SS 350 vert.
Geezer is offline  
post #9 of 14 (permalink) Old Apr 13th, 11, 09:46 PM Thread Starter
Gold Lifetime Member
 
ZaCamaro69's Avatar
 
Join Date: Jun 2010
Location: Texas
Posts: 1,027
Re: High-pitched whistle

Quote:
Originally Posted by Geezer View Post
Start with the easy things like pulling the PVC valve out while it's running to see if the noise quits instead of pulling the freshly rebuilt TH400 and going through it again cause thats where the noise seems to be coming from....
Ron, you sound like a smart man who is speaking from experience! Will try the PCV valve manana and report back.
ZaCamaro69 is offline  
post #10 of 14 (permalink) Old Apr 14th, 11, 06:02 AM
Edm
Gold Lifetime Member
Ed
 
Join Date: Jul 2010
Location: Titusville, Florida
Posts: 260
Garage
Re: High-pitched whistle

Spray carb cleaner around the base of the carb with the car running. If the idle changes then you have a leak at the carb and its just a matter of pinpointing it.
Edm is offline  
post #11 of 14 (permalink) Old Apr 14th, 11, 08:11 AM
Senior Tech
Mark
 
Join Date: Mar 2001
Location: NJ
Posts: 478
Re: High-pitched whistle

A leaky vacuum brake booster will make that exact sound. I know you said its seems to originate from the carb but I would temporarely disconnect the brake booster to rule it out.

67 RS Convertible, 355ci, 650cfm, 5-speed, 12-bolt, 3.90 gears. 12.7 @ 110 mph
Marktat is offline  
post #12 of 14 (permalink) Old Apr 14th, 11, 09:23 AM Thread Starter
Gold Lifetime Member
 
ZaCamaro69's Avatar
 
Join Date: Jun 2010
Location: Texas
Posts: 1,027
Re: High-pitched whistle

Quote:
Originally Posted by Edm View Post
Spray carb cleaner around the base of the carb with the car running. If the idle changes then you have a leak at the carb and its just a matter of pinpointing it.
I almost wish this would be the case. THat way I could create an excuse to get rid of the Edlebrock and pick up a Holley.

BTW, that's a bitchin ride you got there. Are those TTII rims in 16"?
ZaCamaro69 is offline  
post #13 of 14 (permalink) Old Apr 14th, 11, 12:56 PM Thread Starter
Gold Lifetime Member
 
ZaCamaro69's Avatar
 
Join Date: Jun 2010
Location: Texas
Posts: 1,027
Re: High-pitched whistle

Y'all were right: it was the PCV. I popped the plug off the passenger side VC and the noise went away immediately. Going to go pick up a breather.

Thanks all!
ZaCamaro69 is offline  
post #14 of 14 (permalink) Old Apr 15th, 11, 09:48 PM
Edm
Gold Lifetime Member
Ed
 
Join Date: Jul 2010
Location: Titusville, Florida
Posts: 260
Garage
Re: High-pitched whistle

Quote:
Originally Posted by ZaCamaro69 View Post
I almost wish this would be the case. THat way I could create an excuse to get rid of the Edlebrock and pick up a Holley.

BTW, that's a bitchin ride you got there. Are those TTII rims in 16"?
Thanks, good lookin ride yourself. The wheels are 15's. Maybe 16's or 17's after the power tour.
Glad to hear you got the noise fixed, I cannot stand any rattles, ticks or whistles. I have been chasing a small exhaust leak for days now.
Edm is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome