While I was refitting my weber carburettor last night and reconnecting the ported vacuum switch (PVS) which on my car is green colour and is screwed to the underside of the inlet manifold, I noticed that somebody (previous owner) had deliberately blocked the bottom most tube by inseting a short length of metal rod. This was obviously done many years ago and renders the PVS inoperable but I am wondering if anyone has any idea as to why it would have been done?
I'm not really clued up on what the PVS does exactly. I believe it was a late-in-the-day modification to improve hesitation on start-up with weber carbs. Anyone out there know exactly how it works?
Any advice would be much appreciated
Ported Vacuum Switch (PVS)
I'm also interested in what this does. . .
as I'm fitting a weber n inlet with this to my 1600.
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What the Capri Club say...
This is what Dave at the Capri Club told me...
The bottom tube should go to the engine vacuum. The PVS system is to help hydrocarbon levels on deceleration. The pinto I've had, I have disconnected the system altogether, it is not vital to the running. Just block the other pipe off in the valve to stop air leaks in the Manifold.
The bottom tube should go to the engine vacuum. The PVS system is to help hydrocarbon levels on deceleration. The pinto I've had, I have disconnected the system altogether, it is not vital to the running. Just block the other pipe off in the valve to stop air leaks in the Manifold.