TM  10-3930-643-34 ENGINE,  FUEL,  EXHAUST  AND  COOLING  TROUBLESHOOTING  AND  MAINTENANCE.  (cont) 4-1. Engine,  Fuel,  Exhaust  and  Cooling  Troubleshooting.  (cont) MALFUNCTION TEST  OR  INSPECTION CORRECTIVE  ACTION j.  INTAKE  MANIFOLD  PRESSURE  BOOST  TEST.  (cont) When performing test with vehicle at full stall, apply brakes before engaging  transmission  and  clear  all  personnel  from  the  immediate  area. Failure to follow this procedure could result in SEVERE INJURY or DEATH. During full stall, do not engage steering system; to prevent over- heating, do not exceed 15 seconds per stall check; do not allow torque converter  to  exceed  normal  operating  temperature. NOTE Full stall is the speed of engine with throttle at maximum, vehicle in highest  gear  with  brakes  applied  and  hydraulic  control  valve  activated to  demand  maximum  hydraulic  relief  pressure. 3. Start engine and operate vehicle under full stall conditions. Read pressure gage. Pressure of intake manifold should be 13-17 psi. 4. Stop  engine. Remove  pressure  gage. Install plug in intake manifold. 4-12