EGR Solenoid

I hope it's OK to borrow one of Dr. Bill's pics, but in scouring the board for answers I came across it and it will greatly help to explain my question. I just finished rebuilding and re-installing my 91 3cyl. I cannot find the green and white wires (Item C in Bill's Pic) that are supposed to attach to the EGR solenoid. The car was tampered with when I bought it and I'm not sure if they were ever there. What happens if this thing is not hooked up? P.S. thanks for the pic Doc



http://img401.imageshack.us/img401/4852/morerightside4fz.jpg