I have this weird problem with my IACV. I just swapped a y5 intake manifold onto a y7 and ever since then I'm having this problem with the IDLE. Pretty sure that the IACV is messed up. I re pinned my ecu to accommodate for the 2 wire IACV and now running ODB1 ecu with Uberdata. I even got a new IACV but it didn't make a difference so I switch back to my other orignal IACV
b/c I had better luck with that one. When I'm lessening to the car rev up and down I hear more air coming into the air filter like the IACV opening. I have a video of the IACV opening or what I think it is.

Also is my wiring right for the IACV? I'm pretty sure it is but what to make sure.


http://os5.servehttp.com/~silas/honda/P1010001.JPG bigger size image

http://os5.servehttp.com/~silas/honda/P1010002.JPG bigger size image
http://os5.servehttp.com/~silas/honda/video.MOV quicktime is required

 

I gotta hand it to you on the clean wiring job.
I think you're getting what happened to me. Pull the manifold back off and make sure that the surface on the head and manifold are absolutely PERFECT. If you leave on fleck of old gasket on there, you WILL have revving problems. I totally missed a little chunk under one of the lower studs and mine would shoot to redline and back. It was ugly!
If it only does it when it's cold, you may have the problem that I've seen with tons of LS swaps. For some reason the p75's love to have a rolling idle. My buddy has a d16a6 in his sol with tons of goodies. He had been running it off a P06 for a long time but we tried my p75 in it. Ran WAY better, but his cold idle is way out of control. Let it warm up and it's fine.... Boggling...

The other thing.... I know my hondata has a control for the duty cycle on the IACV. Does uberdata? I'm sure it should. I'd turn the duty cycle up a bit on it, and that should control it much better.

 

When you have the car on, put your finger over the IACV hole in the throttle body, if the car goes back to idle then you know its the IACV. If the car still revs up and down then it might be your FITV.

Did you have this problem at all with your other manifold?

 

My EG does this too. Let me know what it was if you figure it out. I can't figure out what is causing this either. I gave up on it a while ago .

 

My throttle body has only one hole in the inside which means my car doesn't have a FITV.



This didn't happen before I installed the new intake.

Does the wires look aright though. I mean are they going to the right wires?