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c3 vacume system

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MADLT1:
hi guys,i have been in the garage all day working on my 71 vets vacume system,i have replaced the 2 canisters behind the lights,plus the 2 actuators inbetween,the only 1 I have not replaced is the I for the wiper door inside the fender.so what has happened when I turned the engine on is the headlight doors rose up but very slowly,but they would not pull down?so do I replace the wiper actuator?can I use one of the 2 old actuators that I replaced for the lights?they look the same,but not sure if there is a diferance?or could it be the canisters need more adjustment one way or the other?i have a vacume gauge and I was getting vacume from the tank forward,i will do more testing tomorrow and go over the pluming again,its just so time consumeing,i had to walk away lol,cheers

bfit:
You have a loose hose at the front of the car or a split hose
In the nose just in front of the hood line .
That what I would start with.
Bfit

MADLT1:
no I replaced those hoses,now I am thinking it could evan be the headlight switch?ill do some more vacume testing tomorrow

bfit:

--- Quote from: MADLT1 on February 03, 2016, 08:38:11 PM ---no I replaced those hoses,now I am thinking it could evan be the headlight switch?ill do some more vacume testing tomorrow

--- End quote ---
Have you got vacuum in the canister before you start the engine
Bfit

Vettech:
I'll probably be out of order here, but on 78on the res was in the tubular steel section welded between the chassie rails at the front roughly under the lights, I could park, come back a week later, pull the switch and up they came (no engine running). Get some vaccumn & tube and put it straight onto each actuator. One of mine developed a hole in the actuator rubber diaphram so I replaced it as a complete unit. With Vac on each they should, if not siezed or Impeded, come straight up/down. Having said this,  please remember, 71 is not forteau. On a VK Commodore upon heavy accel, all dash A/C outlets would go haywire, I used a black plastic cystern float ball (easter eggy shape) brass fitting each end plus one way valve - instant cheap vaccum reservior. I hope something here helps. Bfit would know better than I, but lumpy cams I believe, may also cause lose of vac.

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