OK Folks, after failing my last emissions test (~190 HC's), I am trying to track down whats not working. This is a '91 NA, all emisions equpitment and such still attached. Low O2 % led me to beleive my ACV wasnt working. Chekcing out the solenoids, I find my relief solenoid acting rather odd;

I checked the blue plug going to it with a voltmeter, and at rpm < 3600, it is 12v, rpm > 3600, low (~1.5v) . Checking the FSM, pae F1-80, it seems to say that I should get exactly opposite this behavior. Looking at the diagram of how the secondary air system works, this does indeed make sense; if I can reconcile this problem, it should work properly.

But why on earth is it doing this?

Should I do the brute force thing and wire splice a relay into the wiring to reverse this behavior?