Vacuum Leak?
Thread Starter
Intermediate
Joined: Feb 2005
Posts: 49
Likes: 0
From: so cali ca
Vacuum Leak?
Ok so for the past few days I've been experiencing a very high pitched whine coming from the engine area, it only occurs at speed and not when I'm at a stop. I was looking over the motor today and I discovered that a hose had possibly blown off, I've attached a photo of where the inlet has no hose attached. What is this hose for and could this be causing the whine? Also, what is the best way to locate said hose and re attach? Thanks and sorry for the newbie question, I just want to get my baby fixed as fast as possible.
I drew a blue box around the area where the hose seems to have came off of....this isn't a photo of my setup just a similar setup to show where the hose flew off.
I drew a blue box around the area where the hose seems to have came off of....this isn't a photo of my setup just a similar setup to show where the hose flew off.
Team Owner
Joined: May 2006
Posts: 21,473
Likes: 356
From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
Yes! that certainly will cause your High pitch whine - and it will pressurize under BOOST when you are getting on it - hence the clamp around it!
That one is used for pulling Crankcase pressure out of the motor and it will generally go to the Valve Cover - BUT under B@@ST it "NEEDS" a one-way check valve on it so it will not pressurize the crankcase -
Usually these are capped off and another source is used to pull the pressure away from the crankcase (Example - it can go to the intake tube before the SuperCharger) - make sure that anything going to the motor has a oneway check valve on it
or it will not pull pressure away but pressurize the crankcase and blow out motor seals 
I know, it happened to me
Thanks,Matt
That one is used for pulling Crankcase pressure out of the motor and it will generally go to the Valve Cover - BUT under B@@ST it "NEEDS" a one-way check valve on it so it will not pressurize the crankcase -
Usually these are capped off and another source is used to pull the pressure away from the crankcase (Example - it can go to the intake tube before the SuperCharger) - make sure that anything going to the motor has a oneway check valve on it
or it will not pull pressure away but pressurize the crankcase and blow out motor seals I know, it happened to meThanks,Matt
Instructor
Joined: Sep 2004
Posts: 179
Likes: 10
From: Malone New York
Thread Starter
Intermediate
Joined: Feb 2005
Posts: 49
Likes: 0
From: so cali ca
where exactly is the port on the valve cover? thanks so much for the advice guys.
Also, is it bad for the motor to run with the tube on the tb uncapped like it is right now? the motor makes this high pitch whine/roaring sound at speed, I'm assuming that this leak has been causing it correct? I just want to play it super safe and be cautious, I've invested way too much $$ into my baby for anything to go wrong at this point.
thanks again for all the advice guys!
Also, is it bad for the motor to run with the tube on the tb uncapped like it is right now? the motor makes this high pitch whine/roaring sound at speed, I'm assuming that this leak has been causing it correct? I just want to play it super safe and be cautious, I've invested way too much $$ into my baby for anything to go wrong at this point.
thanks again for all the advice guys!
Last edited by tunedZ; Feb 25, 2010 at 05:35 AM.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
