S (stall issue): With this issue the turbine speed is zero and also the impeller is rotating; the efficiency during the stall stage is minimum, all around 50%, which suggests that fifty percent of the facility coming from your engine is shed by means of friction and dissipated as heat; https://torque-converter-clutch29639.blogginaway.com/34892427/the-2-minute-rule-for-torque-converter-clutch