Wiper Door opens, then closes, when starting
Thread Starter
Melting Slicks
Joined: Jan 2007
Posts: 2,589
Likes: 5
From: Salisbury Maryland
Wiper Door opens, then closes, when starting
Just finished "fixing" the operation of the wiper door. New actuator, wiper valve, soleniod behind tach. Checked all the routing of the hoses and connections. Had a bad relay on the dash panel switch, replaced. Everything works great! The only problem now is that sometimes, yes only sometimes, the wiper door opens when I start it up, then as vacuum builds, it closes.
I've been pulling my hair(and credit card) out getting this working! I can't find any leaks and the system is holding vaccum.
Any Idea's would be helpful.
Thanks
I've been pulling my hair(and credit card) out getting this working! I can't find any leaks and the system is holding vaccum.
Any Idea's would be helpful.
Thanks
Melting Slicks
Joined: Nov 2001
Posts: 2,668
Likes: 43
From: Eastern US XX
Just finished "fixing" the operation of the wiper door. New actuator, wiper valve, soleniod behind tach. Checked all the routing of the hoses and connections. Had a bad relay on the dash panel switch, replaced. Everything works great! The only problem now is that sometimes, yes only sometimes, the wiper door opens when I start it up, then as vacuum builds, it closes.
I've been pulling my hair(and credit card) out getting this working! I can't find any leaks and the system is holding vaccum.
Any Idea's would be helpful.
Thanks
I've been pulling my hair(and credit card) out getting this working! I can't find any leaks and the system is holding vaccum.
Any Idea's would be helpful.
Thanks
Thread Starter
Melting Slicks
Joined: Jan 2007
Posts: 2,589
Likes: 5
From: Salisbury Maryland
Check valve is new, hoses are relatively new. Not sure of the length of time it's been sitting yet, as I just finished it up yesterday. Started it up last night and it just barely opened, then closed again. I've checked for leaks too. If that's as bad as it is, I'll just live with it I guess.
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
To make sure the new relay is good--with the engine running pinch the small hose going to the wiper door relay about 3" from where it connects to the relay and wait for about 30 seconds....if the door pops up the diaphragm on top of the relay is bad.
Thread Starter
Melting Slicks
Joined: Jan 2007
Posts: 2,589
Likes: 5
From: Salisbury Maryland
I'm going to pull the Check Valve out tonight and test it. Perhaps it's got a pc. of dirt stuck in it....
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Could be but you can do the pinch test with it also...just pinch between it and the manifold and see if that fixes the problem if it doesnt then its elswhere.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Advanced
Joined: Jun 2008
Posts: 58
Likes: 1
From: Eastampton NJ
The vacuum relay's no-control-vacuum-applied position is "open the door". If the control-system is not vacuum-tight air leaks in, the vacuum relay relaxes to the open-the-door position, and on start-up the door starts to open before the relay gets enough vacuum to be moved back to the "close-the-door" position. So the door starts open and then closes.
The vacuum system has ONE check-valve, and vacuum goes all over the place. A slow leak anywhere will cause the problem you're seeing.
I built a vacuum supply from a propane tank (new!) and an electric vacuum pump and started testing. I was amazed at how many things (including a new wiper-door actuator) were leaking!
Good luck!
The vacuum system has ONE check-valve, and vacuum goes all over the place. A slow leak anywhere will cause the problem you're seeing.
I built a vacuum supply from a propane tank (new!) and an electric vacuum pump and started testing. I was amazed at how many things (including a new wiper-door actuator) were leaking!
Good luck!
Last edited by bvanpelt; Jul 30, 2008 at 11:44 AM. Reason: grammar!
