It should be capped.

It isn't capped off on mine. Correct me if I'm looking at it wrong, but isn't there a hose connecting that to the double-throttle diaphragm? If not, that probably explains why my car runs weird.

I ended up capping it, and it turns out my problem was the vacuum hose at the VC sensor. It was plugged into the wrong place (engine ground rather than another vacuum connection)

There are two vacuum ports which are side by side. The one closer to the passenger fender points up and this is the one which is capped. The one next to it (points to the firewall) a bit farther from the same fender has the hose coming from the Thermovalve which has a T in it where one of the hoses runs to the Diaphragm.

Good for you, and what is the VC sensor?

Oh, that's right. So that *should* be capped off? I'll have to check mine when I get home but I'm pretty certain it's set up the way you just described.

Sorry OP, just wanted clarification.

And yeah, what is the VC sensor?

You can clearly see in the pic where the vacuum port pointing up has another port next to it which has a vacuum hose connected to it that has a T that splits the vacuum hose so it can go to the Double Throttle.

Damnit, I need to verify/fix this on mine. In the FSM, I was unsure how that area was set up as it looked like the line coming from the DTD was just passing straight through to the thermovalve with no T. I'll try this out when I get home.

Way to hit two birds, satch.

Look at the pics in post #1 of the supplied link. There would be a T valve on autos but not your car. For your car the hose on the left of the thermovalve runs to you Double Throttle Diaphragm while the hose on the right (not shown in pic) runs to a vacuum port below. The port which I say should be capped I believe is for those cars with Cruise Control while the port aimed at the firewall would run to the Thermovalve. Both of these vacuum ports can be treated the same though so if you don't have cruise then one would be used for the Thermovalve while the other is capped.

https://www.rx7club.com/2nd-generati...mation-957138/

Ok, then what I have is routed correctly. The furthest one is capped off, the middle one (opening to firewall) goes up to the thermovalve, and the one pointing up is to the double-throttle diaphragm.

I think I'm going to follow OP's original steps and test the AFM then as the car runs pretty rough in the low RPM.

The nozzle from the thermovalve runs to the diaphragm (one on the right when looked at from passenger side fender). You just stated the port on the manifold pointing up runs to the diaphragm. Understand?

Oops, yeah that's what I meant. At work so I'm multitasking. Thanks.

Port facing the firewall goes up to the thermovalve, the port facing up has the cruise control line routed to it, and then the hose with the delay valve running from the diaphragm to the other port on the thermovalve.

I think I said it right this time.

According to the vacuum line diagram under my hood, that black thing on the passenger strut is the the VC sensor. See the photos.

Thanks again to everyone that has helped me get my car running, I actually had several neighbors come out of their houses and give me funny looks from all the smoke coming out of my FC when I first started her up, haha. I had to adjust the idle and a few other things before I could drive it around town, but the battery wasn't correctly secured (previous owner removed most of the parts that holds the battery in place) and when I went around a corner the battery fell back and hit a pulley and shorted out. I had to push the car home. A lot of the cables coming off of the battery have melted rubber, so I have a lot of work ahead of me.

That's the Pressure/Boost Sensor.