Well, last night I reviewed the wiring diagrams for the emission system so I fully understand how things operate. Tonight I had a plan on how to troubleshoot this. I checked for incoming power to the relays, which was fine. I checked the 17 deg switch wiring and the 100deg switch wiring, all checked out ok. I started the car, pulled the wire off the 100 deg switch, put a jumper on the wire to ground and the 2 way valve clicked open and the motor RPM increased, because it advanced the distributor, perfect... I tried the same thing on the 17 deg switch and it worked as well. Great. So now I increased the RPM over 2400, but the 2 way valve does not open. Can anyone tell me how the speed relay detects the rpm?