3 way check valve info needed
Thread Starter
Burning Brakes
Joined: Jul 2003
Posts: 922
Likes: 1
From: Brisbane Queensland, Australia
3 way check valve info needed
Hi all, as per my cruise control post at:
http://forums.corvetteforum.com/show...66&forum_id=48
BEFORE I go out and try to buy one, can anyone tell me definitively whether or not the '3 way check valve' in the vacuum lines that go to the 'accumulator', cruise servo and intake vacuum, IS actually a 'valve' or just a 3 way connector? - I can blow and suck through EACH of the three ports, but to my mind this shouldn't BE if it's a valve!
http://forums.corvetteforum.com/show...66&forum_id=48
BEFORE I go out and try to buy one, can anyone tell me definitively whether or not the '3 way check valve' in the vacuum lines that go to the 'accumulator', cruise servo and intake vacuum, IS actually a 'valve' or just a 3 way connector? - I can blow and suck through EACH of the three ports, but to my mind this shouldn't BE if it's a valve!
Le Mans Master
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
It's possible to be a cluster problem-but most CC problems are either vacum, fuse,switch or some other related problem. Is your vette standard tranny or auto? The reason I ask is that a standard tranny has the CC clutch switch. And the answer to your question posted is-it is a valve, and you should not be able to blow thru all three at any time.BTW, hope you have the FSM, because there are alot of components to check-I'm sure you have checked all the fuses-right?
Last edited by rick lambert; Feb 14, 2006 at 09:19 AM.
Thread Starter
Burning Brakes
Joined: Jul 2003
Posts: 922
Likes: 1
From: Brisbane Queensland, Australia
Originally Posted by AGENT 86
Every check valve iv'e seen allows flow only in one direction. Sounds like you are the right track to getting this problem solved. 
Thread Starter
Burning Brakes
Joined: Jul 2003
Posts: 922
Likes: 1
From: Brisbane Queensland, Australia
Originally Posted by rick lambert
It's possible to be a cluster problem-but most CC problems are either vacum, fuse,switch or some other related problem. Is your vette standard tranny or auto? The reason I ask is that a standard tranny has the CC clutch switch. And the answer to your question posted is-it is a valve, and you should not be able to blow thru all three at any time.BTW, hope you have the FSM, because there are alot of components to check-I'm sure you have checked all the fuses-right?
Thread Starter
Burning Brakes
Joined: Jul 2003
Posts: 922
Likes: 1
From: Brisbane Queensland, Australia
Thanks 'Redeasysport' & '87capevette', but here in Australia, we don’t HAVE AutoZone stores, nor do we have GM dealers...The closet to GM WE have is GMH (General Motors Holden) which 9 times out of 10 has NO part numbers that match the GM ones.
Still, I would THINK that our GMH OR auto stores such as our 'Repco', 'Autobarn' or 'Super cheap' SHOULD be able to visually match the valve; the main question I had was whether or not a good one DID or DIDN'T allow vacuum/pressure into all 3 'ports'.
I don't even remotely think that replacing the valve will miraculously bring my cruise to life, but at least it'd be ONE component that was correct and could be crossed off 'the list'
A mate of mine told me the VDO has a COMPLETE after-market cruise control setup, WITH LCD screen for about AU$350 - so if all else fails...That's certainly going to be a cheaper option!
Thanks for your replies guys!
Still, I would THINK that our GMH OR auto stores such as our 'Repco', 'Autobarn' or 'Super cheap' SHOULD be able to visually match the valve; the main question I had was whether or not a good one DID or DIDN'T allow vacuum/pressure into all 3 'ports'.
I don't even remotely think that replacing the valve will miraculously bring my cruise to life, but at least it'd be ONE component that was correct and could be crossed off 'the list'
A mate of mine told me the VDO has a COMPLETE after-market cruise control setup, WITH LCD screen for about AU$350 - so if all else fails...That's certainly going to be a cheaper option!
Thanks for your replies guys!
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
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
Le Mans Master
Joined: Dec 2004
Posts: 5,789
Likes: 8
From: Myrtle Beach SC
St. Jude Donor '05-'06
One port is blocked if I remember right.When I replaced mine it held a vacuum when I pulled the hose off I could hear it.One way valve there.I did not notice any vacuum build up on the other.I think the one that goes straight was the one holding the vacuum.It is the one going to the vacuum reservoir I believe.Cheap enough to replace go for it and see what happens.Hope this helps.
Thread Starter
Burning Brakes
Joined: Jul 2003
Posts: 922
Likes: 1
From: Brisbane Queensland, Australia
Originally Posted by Redeasysport
One port is blocked if I remember right.When I replaced mine it held a vacuum when I pulled the hose off I could hear it.One way valve there.I did not notice any vacuum build up on the other.I think the one that goes straight was the one holding the vacuum.It is the one going to the vacuum reservoir I believe.Cheap enough to replace go for it and see what happens.Hope this helps.
IF you're foraging about in your engine bay at all; feel free to unplug that valve and tell me if they all blow and suck ok...
Le Mans Master
Joined: Dec 2004
Posts: 5,789
Likes: 8
From: Myrtle Beach SC
St. Jude Donor '05-'06
I know as I said one will not "suck"it will only do that from the intake side it builds vacuum from the intake and it will not bleed back when the car is turned off.Yes my cruise works fine.
Thread Starter
Burning Brakes
Joined: Jul 2003
Posts: 922
Likes: 1
From: Brisbane Queensland, Australia
Originally Posted by Redeasysport
I know as I said one will not "suck"it will only do that from the intake side it builds vacuum from the intake and it will not bleed back when the car is turned off.Yes my cruise works fine.
Here's a pic of the valve incase anyone needs it in the future:
Team Owner
Joined: Jan 2003
Posts: 20,333
Likes: 262
From: Summerland B.C. Canada
My buddy is heading down under in a week or so to operate a grape harvester. I'll pick one up, hide in his suitcase and then come over and install it. 
I guess i better find out what airport he's landing in because i hate long walks 
I guess i better find out what airport he's landing in because i hate long walks
Burning Brakes
Joined: Nov 2005
Posts: 848
Likes: 1
From: 1992 LT1 6 speed Cayman Islands
Originally Posted by smacko
Ah ok; mines definitely knackered then! I'll get one but I'm sure it won’t be THE reason the CC wont work (Tho it'd be SO delightful if it was!!)
Here's a pic of the valve incase anyone needs it in the future:
Here's a pic of the valve incase anyone needs it in the future:
If you suck on the single line air should not pass through. Sucking on either of the other two ( goes to intake and cruise control) while covering one with your finger, air will pass through. Sucking or blowing on either on the end with two while putting your finger over the bottom one ( Goes to vac reservour) will flow air.
I dont think this is the cause of your cruise not working though as the valve goes to the reservour and only comes into play during WOT or engine off.
Follow the line that goes to the cruise and see if there is a vacium leak anywhere else along it or at the diaphram for the cruise servo. If not you have an electrical fault in the cruise.
Jerris
Thread Starter
Burning Brakes
Joined: Jul 2003
Posts: 922
Likes: 1
From: Brisbane Queensland, Australia
Originally Posted by AGENT 86
My buddy is heading down under in a week or so to operate a grape harvester. I'll pick one up, hide in his suitcase and then come over and install it. I guess i better find out what airport he's landing in because i hate long walks
I guess i better find out what airport he's landing in because i hate long walks
Thread Starter
Burning Brakes
Joined: Jul 2003
Posts: 922
Likes: 1
From: Brisbane Queensland, Australia
Originally Posted by aminnich
I just replaced that same 'valve' n mine last week and the cruise started working just fine after that. You mite be lucky mate.
Looks like believe it or not, I'll need to order one from the states!
Intermediate
Joined: Jul 2005
Posts: 48
Likes: 0
From: Wichita Ks
most of the corvette parts suppliers, at least state side have the valve you need, i bought mine from a place here in the us for 4.99 dollars, dare i say the name EKL... don't know if i can promote it here though .
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia