I'm Swapping a B18b1 into a 1994 Civic Coupe EX, I can figure out where the vacuum hose coming off of the charcoal Canister. On my D16 it connected to s nipple on the Throttle body, but on the b18 throttle body it has no nipple to connect it.

 

What's that brass plug? is that where the nipple would normally be? If so, pull the brass plug out and get a nipple that would fit in there.

 

I have tried to pull it out but it wont budge. Here's a picture of it installed on the D16 Throttle body.

 

Does that hole have threads? If not, you could run a tap into it, and then put a nipple.

 

try to take off the nipple off of the d16 tb