Manual boost controller not working

[Wastelands Warrior]

Does the turbo turn if you reach in..with the engine off...and try turn it?

Is the wastegate stuck open maybe?

I'll have to check the turbo when it's not 5 below 0 out. I'm assuming the waste gate isn't stuck because I was able to move it and the actuator arm with a bar.

[wheming]

Test the actuator with a mityvac hand pump, not by disconnecting line and forcing overboost.
With car off pump up the actuator and watch the arm move. Check what pressure it takes to move. If it pushes right open at 1-2psi, then you have a broken spring. They do break.
If your diaphragm was broken pressure wouldn't move the arm, or it would take much more to move and obviously it wont hold pressure. But that would cause higher than normal boost, just like a bleed.

Others say your arm is adjustable. If so tension so it takes about 10psi or so to get the actuator arm to move when pumping up with the hand pump.

[iTurbo]

I've found that on my Spirit R/T's (stock turbo), if you route the waste gate line directly to manifold source (no controller), I usually see about 6-7 psi at WOT minimum. It might go a little higher at lower elevations than where I'm at though.

In addition to testing with a Mityvac, an easy check would be to hook up the waste gate can directly to the intake manifold and see what your minimum WOT boost is.