69 Vaccum Headlight/Wiper System Problem
Thread Starter
Racer
Joined: Mar 2007
Posts: 278
Likes: 2
From: Wellington Florida
69 Vaccum Headlight/Wiper System Problem
I am having a problem with my lights raising and wiper door opening and then closing when I start the car. Also, when I jump on it the headlights sometimes come up.
There are no vaccum leaks in the system when the car is running. Idle is great and when I pinch off the vacuum supply at the manifold there is no change in the idle. Everything seems to operate great. I replaced the check valve near the intake manifold connection with no change.
Any secrets will be appreciated!
There are no vaccum leaks in the system when the car is running. Idle is great and when I pinch off the vacuum supply at the manifold there is no change in the idle. Everything seems to operate great. I replaced the check valve near the intake manifold connection with no change.
Any secrets will be appreciated!
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
I am having a problem with my lights raising and wiper door opening and then closing when I start the car. Also, when I jump on it the headlights sometimes come up.
There are no vaccum leaks in the system when the car is running. Idle is great and when I pinch off the vacuum supply at the manifold there is no change in the idle. Everything seems to operate great. I replaced the check valve near the intake manifold connection with no change.
Any secrets will be appreciated!
There are no vaccum leaks in the system when the car is running. Idle is great and when I pinch off the vacuum supply at the manifold there is no change in the idle. Everything seems to operate great. I replaced the check valve near the intake manifold connection with no change.
Any secrets will be appreciated!
Last edited by ...Roger...; Jul 27, 2007 at 10:42 PM.
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
The above test was for the BIG vacuum hose side.
The "switch" for UP and DOWN is vacuum and on the LITTLE vacuum hose side!!!
Vacuum applied is DOWN
Vacuum removed is UP
small hose test-with the engine running-pinch the small hose going to one of the relays-wait a min.and tell what happens.Do this test to all of your relays.Report back keeping what happened per relay seperate.
Le Mans Master
Joined: Jun 2006
Posts: 6,400
Likes: 1,226
From: Tampa Florida
I am having a problem with my lights raising and wiper door opening and then closing when I start the car. Also, when I jump on it the headlights sometimes come up.
There are no vaccum leaks in the system when the car is running. Idle is great and when I pinch off the vacuum supply at the manifold there is no change in the idle. Everything seems to operate great. I replaced the check valve near the intake manifold connection with no change.
Any secrets will be appreciated!
There are no vaccum leaks in the system when the car is running. Idle is great and when I pinch off the vacuum supply at the manifold there is no change in the idle. Everything seems to operate great. I replaced the check valve near the intake manifold connection with no change.
Any secrets will be appreciated!
Just checking.
Team Owner
Joined: Aug 1999
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The symptoms do sound like a check valve and/or filter issue, at least on the surface.
Otherwise, it sounds like an issue with the control (small vacuum tube) side of the system. A leak in that side of the system could cause the startup problems if the control side isn't de-pressurizing as fast as the actuation side of the system. For things to move when you step on the throttle, the control side would have to have a pretty prominent leak.
Do you have a vacuum pump, like a mityvac? Disconnect the small tube from the check valve and draw it down. How much vacuum will it hold and for how long?
I've made several posts over the years related to the vacuum system. You can do a search for my username and use "vacuum" as the keyword. Make sure you check the archive box and the C3 section.
Otherwise, it sounds like an issue with the control (small vacuum tube) side of the system. A leak in that side of the system could cause the startup problems if the control side isn't de-pressurizing as fast as the actuation side of the system. For things to move when you step on the throttle, the control side would have to have a pretty prominent leak.
Do you have a vacuum pump, like a mityvac? Disconnect the small tube from the check valve and draw it down. How much vacuum will it hold and for how long?
I've made several posts over the years related to the vacuum system. You can do a search for my username and use "vacuum" as the keyword. Make sure you check the archive box and the C3 section.
