I’m trying to find an air leak near my fpr and found this piece was broken. If anyone knows what it’s called so I can get a new one, it would be greatly appreciated. It’s an 86 NA if that matters at all

 

Mazda calls it HE01-20-309, Delay Valve

 

Ey you the man, thanks

 

Another small problem, I didn’t pay attention to which way the arrow was pointing when I took it off, which way should I point?

 

that is a good one! you should be able to pull vacuum on the diaphragm all the time, but when you stop pulling vacuum, the throttle/diaphragm should slowly open

 

I'm not actually sure which way the arrow points as I could not see it with it on the car. According to the FSM it seems that it should point forwards (page 4A-59). Your failure does create a vacuum leak when the engine is cold. On a related note, check if the diaphragm holds vacuum, as most original ones have failed at this point. If it doesn't just cap off the line at the back as the double throttle setup is not really necessary anyways. It just prevents you from applying full throttle when the engine is cold, do that manually instead.

I'm personally planning on adding a cap in-line to keep the stock look of it. I need to get some hoses for it first though, the old ones are questionable at this point.