Interesting. I'll have to take a closer look at mine. I have a later version of the S2s so thats a little concerning.
My car is just a street car though so it doesn't see that kind of sustained RPM which means I hopefully don't have that.

 

yup you'll be fine. the v1 cams were cast then V2s are billet so i'm thinking this is a known issue

 

Still going to take a look. Probably while I'm doing the topline lifters lol.
If that works then the only issue with mine will be dying when coming to idle with the AC on lol. That has been kicking my *** for years.

 

in my previous tune I had to set idle rpm to 1k to get rid of that issue. then just months ago it started dying just when I coast to make a turn which would have been bad if i came in too fast with no brakes and power steering (i carry floorjacks and stuff in my trunk so i am carefully slow). now with new engine, MAP, IAC sensor and SD tune my rpm is bouncing around, rev hanging sometimes and could die when I coast. Tackling this is my priority right now
do the kigly thinger if you havent yet

 

Yea what you describe with the SD tune is exactly the issue I was having. I replaced the MAP sensor and it fixed everything but the idle with the AC on. It's been super annoying. Increasing the idle RPM doesn't seem to help, it just bounces and dies. I have caught it in logs and everything looks "normal". Its a pretty annoying thing but I just stopped using the AC unless I'm on a long highway cruise.
Already got the kigley in there!

 

the e85 (primary) tune on mine had that issue initially but they disconnected the MAF and maybe tuned something out and I think its gone. I'll compare to previous files and see what changed. but now i have that issue for the 93 tune. I'll try to figure it out before I dump the fuel
btw did you set all AC rpm to the same value?

 

Yea, mine is a flexfuel setup and has the issue on both tunes. I am still looking at it for ideas but I am out.
My ROM doesn't have an AC RPM defined, it just has like the AC idle stepper table I think it is. I have played with that a bit but without any improvements.

 

update:
for 3 days the noise has not returned
today(saturday) the noise returned when going to the range
and stopped when i returned home....

 

@schuhie so apparently even my e85 tune still dies but much much less frequent.
my working theory is that my new & old PCV's are sticking ... i have to blow harder to get some flow thru them. that said, there really isnt much air you can flow thru them ... post EGR/EVAP delete, that minimum amount of air that is needed to decel/idle the engine is going to be pulled from the IACV <- i dont have the $original part in the car anymore (although i might still have it in storage) might not be opening/unsealing properly so it could be cycling (alternating with the the PCV) trying to reach the target rpm. I'm experimenting using a more free flowing PCV which I may need to regulate depending on the target rpm (or not if it flows just right). I'm using the PCV from an STI (i think) we'll see how it goes. right now it idle/rev/idle fine but havent driven it yet. maybe on friday after the rains

 

That would be sweet if you found something that worked on your setup. At least I would have a starting point.

I have the original PCV and a junkyard replacement IACV on my car. I also have catch can in between the PCV and intake manifold. Them alternating back and forth would make some sense. That was always how I felt about it, it revs something changes IACV tries to catch it, idles down and the other thing changes again, etc. It never made sense to me that it was just a simple bad IACV as others have said to me for years lol.

I used to have a Boomba check valve in line with my PCV on the other side of the catch can; maybe I should try that again.