Need Vacuum Help
Thread Starter
Heel & Toe
Joined: Feb 2005
Posts: 18
Likes: 0
From: Shreveport La.
Need Vacuum Help
I am having a problem with my '68 Roadster headlight doors and wiper door. Both were working perfectly but both quit working at the same time. When they quit working the wiper override light came on and stays on.
I have 13 inches of mercury at the intake manifold all the way to the inlet to the reservoir. At the discharge of the vacuum reservoir I only have 5 inches of mercury, it takes the gauge several seconds to get up to 5. I assume that if the reservoir has a leak I should be able to by-pass it and the system should work. I connected the vacuum line from the intake manifold directly to the tee
immediatly downstream from the reservoir, this should by-pass the
reservoir, but neither system works.
I would appreciate some help on this. Does anybody have any insight on what would make both systems cease to operate?
Thanks in advance!
I have 13 inches of mercury at the intake manifold all the way to the inlet to the reservoir. At the discharge of the vacuum reservoir I only have 5 inches of mercury, it takes the gauge several seconds to get up to 5. I assume that if the reservoir has a leak I should be able to by-pass it and the system should work. I connected the vacuum line from the intake manifold directly to the tee
immediatly downstream from the reservoir, this should by-pass the
reservoir, but neither system works.
I would appreciate some help on this. Does anybody have any insight on what would make both systems cease to operate?
Thanks in advance!
Intermediate
Joined: Jul 2007
Posts: 40
Likes: 0
From: Brownstown Michigan
Corvette America or Ecklers Corvette has great troubleshooting manual for your problem. I bought a copy, read it a few times and fully understood the science behind how the vacuum system works. My wiper door would not go down and would only stay up. I follow the vacuum schematic system and it led me to the override switch under the dash right below the tach gage. After I replaced it, everything works like a charm. SmokinBBC is correct!
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Both systems are connected(headlights and wipers)...thats what makes it difficult to figure out sometimes.each have 2 parts....the large hose vac. part that moves the doors and the smaller hose part that "TELLS" the large part "what" to do.
