Home Improvement Handtools and Power Tools

the very first nut i put it on and sounded like air was just blowing by. i adjusted the knob for torque(1-4) but still nothing. i can pull the trigger and at wide open i can stop the socket with my bare hand! the internals are as goes; Air Compressor, set to 115 psi, 1/4" nipple which goes into the guns adapter, which consists of a spring then a ball then the handle of the gun. do not have enough air pressure? the box says 90 psi is good. btw its a central pneumatic from harbor freight. please help.