is this a part of the air injection system or something? its leaking vacuum and I need to replace or block it off. It was tied up by the previous owner with some wire to stay in that position, so not sure if I should just remove and block it off.
1986 NA 13b

 

That is one of your 5/6 port actuator rods. Looks like you're missing the actuators entirely. These not working will cause a loss of low end torque

 

Cardinell is correct.

As far as fixing the vacuum leak, you need new seals. OEM are no longer available, but you can find seals on AliExpress that work. Check out this thread.

As far as the best solution, you should replace the actuators. For a temporary solution, keep them wired open. Low end will suffer, but at least you still have all the high end power available to you.

EDIT: Link didn't work. https://www.rx7club.com/2nd-generation-specific-1986-1992-17/na-six-port-actuator-seal-replacement-1156916/

 

thanks guys. so its the 5th and 6th port actuator. I found one online, question is, I need 2 I assume, and are they connected to the exhaust? I read somewhere else they activate via exhaust backpressure or something at like 3psi. I also found people who say it doesn't effect low end power, and I never noticed a lack of power low end, but I never drove it with these working since this was previous owners work. and if they come on at 3000 rpm, is it even worth it to go repairing that system? I will get those seals for both and fix the leak in the meantime. right now I'm chasing vacuum leaks because the car wont stay running.

 

You need two actuators. The supply for them comes through the manifold when they're bolted up, so you don't need any other parts. They do have a seal that goes between them and the manifold as well, but that's it.

IMO they are low-priority while the car has other issues (like the vacuum leaks). However, you will want them long term.

NA 13Bs don't make that much power. The aux port setup is designed to get you as much high end power as possible while maintaining port velocity at idle and low rpm. The functional actuators will improve the idle, make it easier to take off at low rpm, and generally make driving around town more pleasant. If you intend this to be a track car then don't worry about it, but for street cars IMO you should restore the system.

EDIT: Actually, it looks like you no longer have the tube from the catalyst that provides the back-pressure. Your options are to get Racing Beat headers that have the fitting on them, have a shop add the fitting to your current headers (or do it yourself), or convert to an electric air pump with solenoid and rpm based switch.

 

yeah I assume they are gone because the previous owner put a custom exhaust in. I added the 02 sensor as he hadn't even put a bung for that into it.
I eventually want to get the adaptronic ecu and add a turbo when I rebuild, which may happen sooner then I was expecting because either I have huge vacuum leaks somewhere or my apex seals are toast. I was getting 80psi compression so I was hoping its just vacuum leaks I have to fix.
thanks again.