I'm having an issue with my 94 civic ex iacv. Apparently when trying to clean mine I thought the two screws placed near the hose connectors needed to be removed. After much strain I managed to get one off but now I find out this is causing a leak. And to make matters worst, I lost the screw. Stupid mistake I know. But now I need to replace the missing screw but I have no idea what size they are and I can't sem to find an answer online. If anyone has any positive suggestions, I'm all ears.

 

Probably a M5 x 1.0. All of the hardware on a Civic is metric of course. If you have access to another car, take the whole valve off of your car and go to a hardware store to find screws that fit.

You can also rearrange the little coolant hoses to bypass the valve. The coolant is only there to preheat the valve and make the engine run slightly better in cold weather. It is not essential.