Why coolant routes from the throttle body to the idle air controller? Does the IDLE depends on coolant temperature??
Your fast idle valve uses it, the TB just gets it to pass through to warm it up, you can bypass it if you choose. I did, but you need to take off your fast idle valve and block it. Just run your coolant line that went into your eacv directly to the nipple off your Intakemanifold near the head. When you buy a heatshield gasket from Hondata it comes with instructions on how to do this and why it helps lower intake air temps.