Looks like this:

 

 

The valve inquestion is off an 86 T wagon. Tested mine and it failed. I believe it is the reason I am having poor hot idle and failing my smog test.

 

If you bought one from autozone or if there is a place on the net that rebuilds them let me know. I can only guess that the dealership wants an arm and a leg for one of these. Heck they wanted $140 for a vaccum advance? Thanks

well the junkyard yeilded another broken one I guess I am off to the dealership. Eh I guess I need to go there anyway I needed new shifter bushings anyways

Dealer wants $64. I found two on the marketplace, but I broke nipples on both while installing. My county doesn't have emmisions testing (yet), so I'll wait until I absolutely need it before I try to fumble with it again.

i got an 84 brat that has one of them, im fixing to swap one out with the wrecked one i got a hold of. i hope it makes it run better. dont know if mine is bad. what is the purpose of this thing. im new so dont slam me..might can help with parts.

If you find out that you need another one, I have a known good unit for $6 shipped in the lower states.

Yeah, can anyone tell me what that thing is for? Is it anything to do with the EGR valve? My EGR doesn't work at any temp or throttle position so I've been trying to track down the problem, and I saw that that thermovalve looks like it's connected to the egr's vacuum line.

The thermovalve on my 86 t wagon is in charge of the vacuum advance more than anything. There is a seperate vacuum silinoid that is responsible for egr function.

 

Not sure what your car is (mpfi, spfi, carb, or turbo) Different models have different use for the device.

 

Here is a schematic for a carb (cal) car

 

 

 

I ended up getting the valve from the dealership for a lot more than $6

Yep, carbed. The schematic shows the middle outlet on the thermovalve going to a "T" one leg of which goes right to the EGR valve. I'll have to play around with it and try applying vacuum to that hose and see if the egr'll open up or not. I guess I didn't know it was called the thermovalve, I'll have to dig out my haynes and see if the federal-spec diagram is the same.