EGR Valve sealing ability.
Thread Starter
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
EGR Valve sealing ability.
Currently chasing a hesitation problem and without going off in a tangent on that at this time I was reading a post recently about a EGR problem which got me thinking. I am not done checking out the fuel system yet but the EGR is quick to do.
Once I got it out I cleaned it up. Suction opens it and there is no diaphragm leaks there. But when I suck on the round stub, it seals but not 100%. I can still pull some slight air thru it. When I connect my vacuum pump to it, it does not hold any pressure at all. I'm not sure is a slight seepage is normal but if it is affecting manifold pressure it could be affecting the FPR regulation.
How tight should the sealing be?
Going to a part store in the next couple days just to look at a new one and see if there is any noticeable difference.
Once I got it out I cleaned it up. Suction opens it and there is no diaphragm leaks there. But when I suck on the round stub, it seals but not 100%. I can still pull some slight air thru it. When I connect my vacuum pump to it, it does not hold any pressure at all. I'm not sure is a slight seepage is normal but if it is affecting manifold pressure it could be affecting the FPR regulation.
How tight should the sealing be?
Going to a part store in the next couple days just to look at a new one and see if there is any noticeable difference.
Racer
Joined: Jul 2013
Posts: 275
Likes: 1
From: Colorado Springs
Currently chasing a hesitation problem and without going off in a tangent on that at this time I was reading a post recently about a EGR problem which got me thinking. I am not done checking out the fuel system yet but the EGR is quick to do.
Once I got it out I cleaned it up. Suction opens it and there is no diaphragm leaks there. But when I suck on the round stub, it seals but not 100%. I can still pull some slight air thru it. When I connect my vacuum pump to it, it does not hold any pressure at all. I'm not sure is a slight seepage is normal but if it is affecting manifold pressure it could be affecting the FPR regulation.
How tight should the sealing be?
Going to a part store in the next couple days just to look at a new one and see if there is any noticeable difference.
Once I got it out I cleaned it up. Suction opens it and there is no diaphragm leaks there. But when I suck on the round stub, it seals but not 100%. I can still pull some slight air thru it. When I connect my vacuum pump to it, it does not hold any pressure at all. I'm not sure is a slight seepage is normal but if it is affecting manifold pressure it could be affecting the FPR regulation.
How tight should the sealing be?
Going to a part store in the next couple days just to look at a new one and see if there is any noticeable difference.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
You can unscrew the seat and clean it. See this:
http://tech.corvettecentral.com/2012...egr-diagnosis/
http://tech.corvettecentral.com/2012...egr-diagnosis/
Thread Starter
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
You can unscrew the seat and clean it. See this:
http://tech.corvettecentral.com/2012...egr-diagnosis/
http://tech.corvettecentral.com/2012...egr-diagnosis/
I did not know it came apart in that way. I will be driving the car today and see if there is any change from the clean up yesterday.
I read the link quick but when I get some time I will read it more carefully and re-visit the EGR when I'm ready.
Thread Starter
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
So I went to the store and checked out a new EGR. Other that it being new, I can't really say I see any difference between the new and my original. The new one did not hold suction and had similar leakage to mine.
I may give my EGR a better cleaning and follow the "link" information, but I don't think at this time my EGR is bad and don’t think I am on the right track for the problem I'm trying to solve.
I may give my EGR a better cleaning and follow the "link" information, but I don't think at this time my EGR is bad and don’t think I am on the right track for the problem I'm trying to solve.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
I bought an EGR valve from AutoZone. I tested it on the bench before installing it and it did not hold vacuum. I took it back and bought one from the local Chevy dealer. It did hold vacuum and is now on my car.
I have heard of other people who had problems with aftermarket EGR valves. AC Delco only for me.
I have heard of other people who had problems with aftermarket EGR valves. AC Delco only for me.
Thread Starter
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
I bought an EGR valve from AutoZone. I tested it on the bench before installing it and it did not hold vacuum. I took it back and bought one from the local Chevy dealer. It did hold vacuum and is now on my car.
I have heard of other people who had problems with aftermarket EGR valves. AC Delco only for me.
I have heard of other people who had problems with aftermarket EGR valves. AC Delco only for me.
After reading additional information on the internet the thought did occur to me. What will it do for me. Are there any disadvantages?
I also thought of making the plate at least for testing purposes to see if it has any relationship to my original problem.
I would put a new EGR in if I knew for sure it was fixing my problem.
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