Neo IACVs have water plumbed into/out of them to provide the heat to close the AAC. I am also unsure about vanilla 25s, but maybe the extra plumbing on that is water.
I found this in another thread, now I'm second guessing myself and thinking there was a vac line from near the throttle body to up to the IACV too.
https://saufiles.s3.ap-southeast-2.amazonaws.com/post-59171-1251456228_thumb.jpg
Hey Duncan,
What ports are on the plenum itself?
The new part welded up for the AAC looks like it's a T Piece to go upto brake master, and the other side into the plenum to feed air in.
Brake master vac line on R33 from memory has a one way valve inside of it I believe (middle of pipe). I'll check mine tonight when I get home, I think that pipe is still sitting on my R33.
You're also testing my memory, but I don't believe the R33 has a cold start valve, it just has the IACV doesn't it?
That second smaller port on the IACV itself from factory, goes down and under the inlet manifold, but I can't remember what it plumbs to.
I once hit my knee on an exhaust on my sisters Suzuki Sierra after she drove it her *normal* way. My knee looked like porridge for weeks.
Bec and my daughters never go near this car. I can see one of my dogs losing an ear though. 🤔
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