Sucking Sound
Thread Starter
Le Mans Master
Joined: Mar 2006
Posts: 5,262
Likes: 0
From: E. Amherst NY
Sucking Sound
I replaced my intake manifold gaskets last weekend, and reassembled everything. Now when I run the engine, I have this terrible sucking sound coming from the front section, as if a vacuum line is off. Problem is, I can't see anything visibly wrong. I pulled the line that goes into the ball canister to check vacuum and pulled 18hg.
Thoughts?
Thoughts?
Melting Slicks
Joined: Oct 2004
Posts: 2,510
Likes: 4
From: Austin Texas
Did you put an adequate amount of RTV along the front of the intake manifold? you can check this by getting a can of starter fluid and give some quick bursts along the intake mating surfaces to see if there is a leak. An indication of a leak would be if you notice a change in idle when you spray the starter fluid. That would be the first thing I would do anyway......
Large Impressive Member
Joined: Jul 2003
Posts: 65,811
Likes: 71
From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Are you sure it's not just the sound of money being sucked out of your wallet by Corvette vendors? 
Pro
Joined: Mar 1999
Posts: 678
Likes: 0
From: Oslo, Norway
To check if it is really a vacuum leak spray some startgas or propane in the area and see if the rpm changes. If so I am afraid you have to taka all off and refit it using silicone as an additive to the gasket to avoid vacuum leak
Pro
Joined: Mar 1999
Posts: 678
Likes: 0
From: Oslo, Norway
To check if it is really a vacuum leak spray some startgas or propane in the area and see if the rpm changes. If so I am afraid you have to taka all off and refit it using silicone as an additive to the gasket to avoid vacuum leak
Racer
Joined: Dec 2006
Posts: 367
Likes: 0
From: Beaver Dam Kentucky
Did you put an adequate amount of RTV along the front of the intake manifold? you can check this by getting a can of starter fluid and give some quick bursts along the intake mating surfaces to see if there is a leak. An indication of a leak would be if you notice a change in idle when you spray the starter fluid. That would be the first thing I would do anyway......
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
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Le Mans Master
Joined: Mar 2006
Posts: 5,262
Likes: 0
From: E. Amherst NY
I really used a ton of the right stuff when I sealed up the intake manifold. I also dimpled the front and rear of the block. I probably used the 3/4 of the can when I was reinstalling the manifold, so I don't think it's a leak at the front seal there.
With regard to the TB line to EGR - that's hooked up. I do however, only have 3 vacuum lines going to the EGR 4-way -- but it would appear the one hole is sealed up. Am I wrong here?
With regard to the TB line to EGR - that's hooked up. I do however, only have 3 vacuum lines going to the EGR 4-way -- but it would appear the one hole is sealed up. Am I wrong here?
I thought about that too.
Team Owner
Joined: Jan 2003
Posts: 20,324
Likes: 250
From: Summerland B.C. Canada
Stick one end of hose in ear and the other end around your sucking sound. You should be able to find the problem area quickly. 
As for the EGR hoses, I don't recall as I threw all that stuff away years ago.
As for the EGR hoses, I don't recall as I threw all that stuff away years ago.
Le Mans Master
Joined: Apr 2005
Posts: 8,077
Likes: 4
From: Scarborough ONTARIO
If too much of an RTV than leads to vacum leaks, RTV should be spread thin and evenly any area has little bit of more RTV than it prone to leaks, but iam not sure if it vacum leaks as u said it holds steady 18 hg of vaccum. But here is to how to interpret a vacum gauge:
http://www.secondchancegarage.com/public/186.cfm
http://www.secondchancegarage.com/public/186.cfm
