I have been getting way too familier with my 2004 FX4 4 wheel drive issues. I believe my original soledoid is working as I get about 20 lbs on both actuators when not in 4 wheel drive and atmosphere in 4 wheel drive.

I can get the front hubs to engage if a draw a vacuum on the port on the right hub that runs between the two actuators (which I would assume should be atmosphere when engaged). I am guessing the actuator cannot engage the hub because it is dirty or worn out. Can somebody help a brother out?