Need Help 1969 Corvette Vacuum Problem
Thread Starter
Le Mans Master
Joined: Mar 2000
Posts: 9,127
Likes: 2,326
From: Pottsville, PA. USA Home Of America's Oldest Brewery Yuengling
Need Help 1969 Corvette Vacuum Problem
I am working on a 1969 coupe 350/300 no a/c or power brakes. Here is the problem. When the car is started the wiper door slowly opens all the way to the open position and the headlights also open without being turned on.
Where or what do you think is leaking in the system? If I block off the vacuum at the manifold the engine runs smooth, if I hook it back up the engine runs rough.
Where or what do you think is leaking in the system? If I block off the vacuum at the manifold the engine runs smooth, if I hook it back up the engine runs rough.
Drifting
Joined: Mar 2003
Posts: 1,828
Likes: 212
From: Charlestown IN
Cruise-In V Veteran
Re: Need Help 1969 Corvette Vacuum Problem (Corvette ED)
I'm getting ready to trouble shoot the same basic problem. What I'm doin' is using the diagram in the Midamerica catalog I got. It shows all the parts and labels them. I figure that's a good place to start :D
Race Director
Joined: Jul 2001
Posts: 15,892
Likes: 42
Re: Need Help 1969 Corvette Vacuum Problem (Corvette ED)
You have a SERIOUS leak somewhere in the system, possibly on the side that commands the headlights to 'shut'. You're just going to have to the leg work to track it down. There's IIRC correctly more than 40 feet of vacuum hose on a C3, just trace the lines inch by inch looking for a serious leak- should be obvious when you find it. :chevy
Race Director
Joined: Feb 1999
Posts: 19,659
Likes: 34
From: Lenoir City Tennessee
Ci 6, 8 & 10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15
Re: Need Help 1969 Corvette Vacuum Problem (NOTHIN'LIKE'A'69')
My headlights come up when I get on it for a little while. Gotta do a little looking myself. I thought I had mine all worked out.
Burning Brakes
Joined: Jun 2002
Posts: 837
Likes: 3
From: Texas
Re: Need Help 1969 Corvette Vacuum Problem (Eddie 70)
Here's a good vacuum diagram that might help. http://www.stingray.nu/bilder/vacuum.pdf
Here's a good guide for troubleshooting the various components. http://www.corvette-101.com/ Click on "vacuum trouble".
Here's a good guide for troubleshooting the various components. http://www.corvette-101.com/ Click on "vacuum trouble".
Safety Car
Joined: Sep 2002
Posts: 4,971
Likes: 9
From: The reason time exists is so everything doesn't happen at once
Re: Need Help 1969 Corvette Vacuum Problem (goinbroke)
Here's a good vacuum diagram that might help. http://www.stingray.nu/bilder/vacuum.pdf
Here's a good guide for troubleshooting the various components. http://www.corvette-101.com/ Click on "vacuum trouble".
Here's a good guide for troubleshooting the various components. http://www.corvette-101.com/ Click on "vacuum trouble".
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