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Originally Posted by Gerhard
So what? You just don't hook the lines up the ACIV?
It won't screw anything up?
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How To: TB & IAC Coolant bypass and block plate
Bohl uses a piece of sheet metal in the write up. You don't need to go that extreme, just use a piece of cardboard off of a ceral box as a gasket to block the fast idle thermo valve. I have a Kellogg's Special K gasket
The coolant bypass is an important mod with the intake insulator gasket, it reduces the IAT fluctuation that you observed. Even the Hondata instructions recommend it. And with the FITV blocked, you won't experience any abnormal cold weather idling.