Quote Originally Posted by FastFwd View Post
I cleaned out the IACV pretty good, but there was a HEX Key on the one side which i didnt have to be able to pull the whole thing apart. Do you need to pull this thing out to give it a good clean? im heading to a Honda dealer today to buy new rubber rings for the IACV, and throttle body gasket and few other bits and rubbers/gaskets connected to the intake manifold to ensure theres no leeks.

I need to ask how does the IACV adjust the idle when its connected to two ports in the manifold and connected to water? does the water just cool the IACV? what is the purpose of the water?
I haven't attempted to dismantle an IACV. I'm sure you could ensure a more thorough clean if you did, but there may or may not be issues when re-assembling it...??

The water lines are irrelevent to your problem. They don't cool the IACV, their only purpose is to warm it, I assume for the same reason there is water heating for the throttle body, i.e. to prevent icing up in freezing conditions.

The IACV works by drawing air from a port that starts just before the butterfly, air then passes through this port (which is inside the plenum casting, but closed to the plenum chamber proper) to the end of the port which exits at one of the ports in the IACV. Air is then metered as required (as 'instructed' by the ECU) through the IACV and out the other IACV port into the plenum chamber and from there into the cylinders.