Automobile magazine Ported Vacuum Switch


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How to understand the difference between manifold and ported vacuum sources

On older vehicles the carburetors were often designed with different vacuum ports to provide either straight manifol.

  • SE18

    What does a ported vacuum switch do?

    Whats the difference between a ported vacuum switch and a thermal switch. Ok, so the ported vacuum switch would connect to the choke pull off. (Using a quadrajet).


    This site is funny, as everyone thinks they are a "mechanic", lol, yet no one has probably ever taken any training or anything, yet they give out "good " advise,lol . A ported vacuum switch is a.

  • Night Warrior

    Finding a Ported Vacuum Switch for 2006 Honda CRV?

    Need to know the part number and where I can get a PVS for my 2006 CRV or if there is a compatible PVS for the CRV. It's a dealer part, but can't even find it online and the auto stores do not carry it.


    Are you sure it is a ported vacuum switch. I have not heard of ported vac. switch since the 1970,s. Ported vacuum is anything above the throttle plates, which is in carbureted cars. They have not.

  • Marc-Andre Savoie

    Does this sound like a vacuum manifold or a port vacuum switch?

    I replaced to vacuum advance control on my 77gmc pickup without a fix to my problem. So i followed the vacuum hoses to check for leaks and found this little "thing" just dangling around by the carb. It's not mounted to anything, it's just hanging.


    The object you're describing is likely called a "delay valve" used in conjunction with ported (carb) and manifold vacuum . or vacuum from a TVS (Temperature Vacuum Switch) in the circuit which.

  • Silvestre

    where. is the Ported Vacuum Switch in 95 lincoln town car?


    Which ported vacuum switch.

  • LEE W

    what is the purpose of the ported ignition vacuum switch?

    this unit has 5 ports and is on a 5. 9 l dodge b350 van.


    To control vacuum to different areas that use the vacuum, and to route vacuum to sensors or controls that use vacuum for the engine controls.

  • Ed

    There is a second tvs(blue ported vacuum switch) on my 1979 corvette. Does that connect to?

    The spark delay valve has four ports. two go to the the ported vaccum switch while one one side the distributor is connected and on the other side it connects to the carb. Please help. From what I have seen the distributor connects directly to carb.


    I dont know specifics for that car but in general what GM was doing in that era with those thermal switches was the distributor, EGR, and EFE valve. The EFE was the 'exhaust flapper' that was.

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