Vette(s): Second-month production Shark, this 1968E was built up by original owner into 1969 ZR1 (L88 body with LT1 engine) for Club Racing. Body styling is from Maglioli's 1968 L88 "Le Mans" racer
Joined: 10/27/2010
Posts: 54
Since the headlight vacuum controls are related to electrical, I guessed a query belongs here? Car is a 68E.
I do have the vacuum troubleshooting manual, and the 68 assy manual; and between the pair of them I'd have reckoned I have all the bits connected correctly.
But: with the headlight doors open, starting the car closes the doors briskly, and the headlights turn on and off with the switch but the doors don't re-open.
Neither override switch has any effect on the doors (even when I re-traced all and it appeared I had the rubber plug-ins at the override switches reversed).
Anyone clever enough to know what the problem is?
Thanks so much.
____________________________________
1968E (2nd month production) convertible first registered California 1967 and a retired SCCA race car. It is still race prepped and built up as a '69 ZR1 (announced '69 but not built until '70); i.e., the L88 car with LT1 motor.
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
Joined: 11/8/2003
Posts: 19511
Arrrrgh! Not another vacuum problem!!! So the doors slam shut when you start the engine. How do they get up/open in the first place? Are you manually opening them? If so, then they should close when the engine is started(unless you have the over-ride knob pulled down, or the headlight switch on), so the "down" part is working. I don't know which troubleshooting guide you have, but I have a couple of different ones, with diagrams, and such. I'd be happy to e-mail them if ya want. If all of the hoses are correctly positioned, and all of the vacuum relays are working, and the actuators are in good shape, then they should work correctly...but of course, they never do. I know of at least one vacuum diagram that has the hoses in the wrong location, too... I can only suggest that you check and make sure the check valve is working, and your vacuum tank isn't leaking...
____________________________________ Joel Adams C3VR Lifetime Member #56 My Link
Vette(s): Second-month production Shark, this 1968E was built up by original owner into 1969 ZR1 (L88 body with LT1 engine) for Club Racing. Body styling is from Maglioli's 1968 L88 "Le Mans" racer
Joined: 10/27/2010
Posts: 54
Joel's sent along some diagrams; thanks, Joel! The diagram titled 'simplified' indicated that I had the hoses at the headlight switch reversed (from what is shown on Corvette Central's diagram for the 68E) but reversing them made no difference. The 68E uses a single vacuum relay for both headlights, vs the pair used on later models. So the typical diagram for 69 and later has to be 'interpreted'.
Later an accidental high rpm start broke free the wiper door when using the override valve; it now opens and closes freely even at low idle with the override valve.
And if I manually open the headlight doors, that override valve will close them (but not reopen them).
Easy to understand why kits offering to replace 'those troublesome vacuum headlights' have a market.
I'll eventually get around to acquiring a vacuum test pump on eBay, locally they're very expensive; and use Joel's test regimen on each and every component.
|UPDATED|12/28/2011 6:45:44 PM (AZT)|/UPDATED|
____________________________________
1968E (2nd month production) convertible first registered California 1967 and a retired SCCA race car. It is still race prepped and built up as a '69 ZR1 (announced '69 but not built until '70); i.e., the L88 car with LT1 motor.
Corvette is a registered trademark of the General Motors Corporation(GM) &
Chevrolet Motor Division. Vette Registries, LLC is responsible for all site content (except for member submitted content or where otherwise
noted) and does not claim or imply that Chevrolet or
GM is responsible for Official C3 Vette Registry content. Vette Registries, LLC is independent from GM and is not affiliated
with, sponsored or supported by GM. Copyright/trademark/sales mark
infringements are not intended, or implied and are in fact used to support
GM, Chevrolet and Corvette.
Official C3 Vette Registry content is Copyright 2001-2018, Vette Registries, LLC. Content may not be reused without written consent. All Rights Reserved. NS
Corvette (Vette) Model Years on this site: 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982
30
