revolver

Hey, posting for posterity since the OpposedForces and Wheeling Subaru links are both dead, the part number is 73711-FA000 and supersedes 73710-FA020. Here it is on Subaru's official part website: Part, Diagram, Diagram (alternate in case above breaks) Disregard below, I finally found an EJ18 Vacuum Routing Diagram and it's shown as an air valve on the diagram. A friend and I are guessing it's like the IAC, and lets extra air into the manifold to compensate for the power loss from running the A/C compressor. I'm not sure what this thing does, but it doesn't appear to be on a vacuum routing diagram. I don't have one under my hood because the car's been fiddled with so much, but from a quick search it's not acknowledged anywhere on the diagrams I could find. Initially thought it was part of pulsed Secondary Air on California-only cars due to a diagram pointing close to it, but the solenoid shown on manufacturer data has a little filter on the end of it like an EVAP Purge Sol. Hope this helps anyone in the future as this is currently the top result on Google when looking for an intake/vacuum valve on a GC with an EJ18.

Hey, I found the part number. It's 73711FA000, superseding 73710FA020. I'm not sure what it does with the vacuum, initially I thought it was part of the pulsed secondary air injection system to clean up exhaust emissions, but that one looks has a little filter hat on it. Here it is on the official website - https://parts.subaru.com/p/49283327/73711FA000.html Disregard below, I finally found an EJ18 vacuum diagram and it's listed there. A friend and I suspect it's similar to the IAC, it supplies extra air for the engine to rev up, so it doesn't bog when the A/C compressor is being run. For some reason it's listed as part of the air conditioning system and part of the A/C diagram, despite being connected to the intake manifold. It's not listed on any of the vacuum routing diagrams as far as I've seen, which is why I think so many have had issues finding it.