What causes carb to move to fast idle position? Choke thermostat?

[86Woodgrain]

Here. Hopefully this is detailed enough to explain what you should be seeing.

https://www.youtube.com/watch?v=9i-lUwsrDNk

Thanks, great explanation! On mine I can't duplicate that because my SolVac isn't near the screw even when fully warm, fast idle cam completely off.

[MIPS]

Yep. Time for a swap then.
I've listed a Mopar and Borg Warner part number in the description.

[86Woodgrain]

Thanks. Funny both of mine are the same in terms of how far or not far they stick out with 12V applied.

For reference here's a copy and paste so I can look it up later

Defective Sol-Vac units (open coil or bad diaphragm) should be replaced. Replacement part cross-references I know of are:
Mopar: 83500342
Federal Mogul/Borg Warner: 213-245

[86Woodgrain]

Update: I have not been able to drive my car recently due to a tire issue and doing some tinkering on it.... but I have some exciting news!

I contacted the seller on eBay with the SoleVac unit for sale in the USA and they after a week or so enabled shipping to Canada. So I was finally able to buy it!! Woohoo, it was kinda pricey at $103 Metric Dollars after all is said and done but that will be a new NOS part so yay. The smarter thing to do would be to put that money toward EFI swap but hey I'm trying to keep things original, I'm a little weird like that.

Next up I really need tires, and I need to drop the gas tank and replace the sending unit with one that is accurate. Install those mudflaps I mentioned in the other thread and then I can get back to tweaking the choke! I haven't actually got much done on the car in the last little bit but hopefully in the next 2 weeks I should be able to make some progress again.