Wiper Door???
Thread Starter
Melting Slicks
Joined: Sep 2003
Posts: 2,568
Likes: 0
From: Enterprise Oregon
Wiper Door???
Sometimes when driving the 69 vette the wiper door comes open-not always--i have checked the vac lines what else can cause this--also sometimes but not always the door goes closed when driving also?? Any ideas?? would be welcome--thanks Glenn 
Racer
Joined: Dec 2002
Posts: 421
Likes: 2
From: Long Grove, IL
Glenn,
It sounds like you have an intermittent vacuum leak in the control side of the circuit. I had a similar problem and it turned out to be a leaking wiper override switch under the dash that was causing the trouble. Another thought might be the check valve. You do not say, but if the wiper door only opens by itself when you are accelerating, then your problem may be with the vacuum check valve. The check valve is a silver metal thing that has three hose connections going to it and is located under the hood. Follow the main vacuum line from the intake manifold and you should run into it before you get to the vacuum reservoir.
Oops, forgot to tell you how to check it once you find it. You should not be able to blow through the side with the single port, if you can the check valve will not prevent the vacuum from escaping the reservoir.
Jay
It sounds like you have an intermittent vacuum leak in the control side of the circuit. I had a similar problem and it turned out to be a leaking wiper override switch under the dash that was causing the trouble. Another thought might be the check valve. You do not say, but if the wiper door only opens by itself when you are accelerating, then your problem may be with the vacuum check valve. The check valve is a silver metal thing that has three hose connections going to it and is located under the hood. Follow the main vacuum line from the intake manifold and you should run into it before you get to the vacuum reservoir.
Oops, forgot to tell you how to check it once you find it. You should not be able to blow through the side with the single port, if you can the check valve will not prevent the vacuum from escaping the reservoir.
Jay
Last edited by griffths; Jul 25, 2004 at 10:09 AM.
Instructor
Joined: Jun 2004
Posts: 220
Likes: 0
Originally Posted by Glenn's orange 69
Sometimes when driving the 69 vette the wiper door comes open-not always--i have checked the vac lines what else can cause this--also sometimes but not always the door goes closed when driving also?? Any ideas?? would be welcome--thanks Glenn
I have very low engine vacuum, and at idle and stop lights I have the wiper door opening. I suspect my problem is low vacuum related. I recently read a thread that explained the whole wiper door operating theory. It was extremely informative but I don't remember who wrote it. Maybe an engine vacuum check is in order?
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
IN spite of everthing said about check valves, and hoses, and all that crap, I found one of the better fixes was taking apart the controll relay head band, and cutting/weakening the spring inside, so the relay takes much less vacuum suction to keep the door closed, ie...does not change signals to the canister....
GENE
GENE
Thread Starter
Melting Slicks
Joined: Sep 2003
Posts: 2,568
Likes: 0
From: Enterprise Oregon
???
Where do you find the control relay head band is tha thr whatizt with the rubber covered activator??/ sorry all my other vetted didn't have this vaccume stuff--Glenn thanks everybody for the response 
Thread Starter
Melting Slicks
Joined: Sep 2003
Posts: 2,568
Likes: 0
From: Enterprise Oregon
???
Where do you find the control relay head band is that the whatizt with the rubber covered activator??/ sorry all my other vetted didn't have this vaccume stuff--Glenn thanks everybody for the response
