Vacum control switch vendor?
#1
Vacum control switch vendor?
I have a 72 cutlass with the 350 w/air and can't find a distributor vacum control switch.It is located behind the oil filler tube and has 3 vacum ports and an electrical device on top with 2 prongs.Where can I get one? I looked at autozone and advance.Is there an after market source? Thanks
#3
Unless you're going for a 1000-point restoration or your state's emissions laws require it, forget about it and use a normal and easily found 3-port DTVS without the electrics. All the electrics do is eliminate vacuum to distributor until the car is in high gear. If it or the switch on the transmission end is bad, performance and gas mileage will suffer.
#6
Have you bought one?
Got a pic or can you take and post a pic of it if you have one?
I checked all the parts stores and nobody had one around here or online.
They do have the other type without the electrics.
Do you know the parts store's name and address that had it?
#8
Get one for a 69-70 or 73-75 Olds 350/455, or any that has C (carb) port, D (distributor) port, and M or MT (manifold vacuum) port.
The VENT port on the vac-electric one goes back into the carb air horn right next to the choke hot air stove intake. It vents vacuum to that area whenever the electrics tell it car is not in high gear, instead of allowing vacuum to the distributor vacuum advance.
The electric terminals connect to a switch on the transmission that senses when the trans is in high gear. If that permissive is satisfied, the electric solenoid in the DTVS will move the "pill" inside it and allow vacuum to pass from C port to D port.
If coolant temp gets up to around 258 or so, the DTVS will shut off the C port and open the M or MT port to the D port. This allows manifold vacuum to the vacuum advance, which advances the timing and in turn cools the engine.
The VENT port on the vac-electric one goes back into the carb air horn right next to the choke hot air stove intake. It vents vacuum to that area whenever the electrics tell it car is not in high gear, instead of allowing vacuum to the distributor vacuum advance.
The electric terminals connect to a switch on the transmission that senses when the trans is in high gear. If that permissive is satisfied, the electric solenoid in the DTVS will move the "pill" inside it and allow vacuum to pass from C port to D port.
If coolant temp gets up to around 258 or so, the DTVS will shut off the C port and open the M or MT port to the D port. This allows manifold vacuum to the vacuum advance, which advances the timing and in turn cools the engine.
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