I'm in the middle of swapping out my IAC valve (as it is the only option, or so I've heard) and I'm curious about what to do with the vacuum line running toward the block just under the intake manifold (coming from the back of the IAC). What is it for and what do I need to do with it? I was planning on plugging it off, but I figured that'd be pretty dumb to do before I even know what it is.

 

back to page one. Anybody?

 

well i'm not sure which ones your talking about....

I use only the following

(big one up top) for the brake booster
(big one up top) for the PCV valve (valve cover)
(rear one for MAP sensor -instead of TB)

that's it.. i don't have the EGR anymore (hondata) so don't need any there.. and i'm runnign a p28. so.... i maybe an exception but that's it... AIC doesn't use any... not sure on a normal h22a or even a lude or accord....

sorry.

 

well, the euro r uses this 3-pin IACV with a vacuum line attached. 98-02 accords (what are those, f22, f23?) use them also. I think it's called a rotary air control valve. I think I'm just going to cap the vac port on the back of the block (unless I learn otherwise before then). I'm guessing it just provides some sort of a cold idle venting or something, not a clue.
well anyway, Thanks for the reply.

 

Try this link: http://www.collectiveracing.ne...;t=87

 

I made the adapter and mounted the 2 pin IAVC already, but if you look at the old IACV, it has that vac port on the back, which wouldn't go to anything on a standard h22. But there's some sort of vac nipple on the backside of the block (euro r h22) that runs directly to the IACV. It provides vacuum to something down there during cold idle.