What was found
THE PILOT COMPLAINED OF INCREASED FRICTION IN THE THROTTLE CONTROL, AND AN INABILITY TO BRING ENGINE IDLE BELOW 1100 RPM. DISCONNECTED THE CABLE AT THE THROTTLE AND METERING ASSY AND FOUND THAT THE LEVER ARM ON THE THROTTLE ITSELF WAS THE SOURCE OF THE FRICTION. ACTUATED THE LEVER ARM STEADILY WHILE LUBRICATING, IN AN ATTEMPT TO DECREASE THE FRICTION AND FOUND THAT THE FRICTION INCREASED INSTEAD. IN ADDITION, FOUND THAT THE RANGE OF MOTION ON THE ARM DECREASED SO THAT IT DOES NOT HIT EITHER STOP. SUSPECTED INTERNAL FAILURE. WILL REPLACE THE UNIT AND THE THROTTLE CABLE TO RESOLVE THE ISSUE.