vacuum question
Thread Starter
Intermediate
Joined: Jul 2010
Posts: 48
Likes: 2
vacuum question
Hey guys,
I have a 1972 cope with a small block. Headlights were functioning fine but wiper door would pop up on start up. Found wiper arm vacuum valve to be bad. Ordered a working one from Willcox and still would pop up on start up and lights worked normal. Tonight I took the tach selonoid off and blew it out. Now on start up my lights and wiper door open then shut. Using the search function it seems that the system is bleeding out. My question is. When I shut the car off. About 30 seconds or so. I hear slight hissing then a loud release of air. Is this normal. I have checked all the actuators and they hold vacuum where need be. My check valve only blows air one way. Any experience or advice would be great.
I have a 1972 cope with a small block. Headlights were functioning fine but wiper door would pop up on start up. Found wiper arm vacuum valve to be bad. Ordered a working one from Willcox and still would pop up on start up and lights worked normal. Tonight I took the tach selonoid off and blew it out. Now on start up my lights and wiper door open then shut. Using the search function it seems that the system is bleeding out. My question is. When I shut the car off. About 30 seconds or so. I hear slight hissing then a loud release of air. Is this normal. I have checked all the actuators and they hold vacuum where need be. My check valve only blows air one way. Any experience or advice would be great.
Safety Car
Joined: Sep 2013
Posts: 4,355
Likes: 2,631
From: Draper Utah
vacuum question
You have a vacuum leak. The hissing is not normal, but if you can hear it leak than it should be easier to find. If you were messing under the dash check the lines going to the over ride switches as they are easy to knock loose.
