I just did an intake manifold swap because i needed the change the IAC valve when i did the auto to manual conversion on my 99 civic ex. I'm having problems because I need to find out what the two inlet outlets on the iac vavle go to. I know one goes to the throttle body but i can't figure out where the other hose goes to. Can anyone help? Is there another way to rig it up. thanx

 

They are coolant lines. They keep the IACV from freezing. you really do not need it if you live in a warm place.

Just make sure you loop and cap the two sides.

 

on the manual ex civics, they use a different iac valve. On d16y7's and automatic y8's they use rotary and have those coolant lines. On manual y8's, the lines aren't coolant lines. so i need to find out where they go to and what they are for... i thought they were vacuum lines....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SandFireTypeR &raquo;</TD></TR><TR><TD CLASS="quote">On manual y8's, the lines aren't coolant lines.</TD></TR></TABLE>

yes, they are.

What IACV are you trying to use?
2-wire plunger style or 3-wire rotary style?
You running a manual EX ECU(P2P)?
You running a manual EX IM?

Sorry, I read the thread fast and skipped up the auto to manual thing.