TM   10-3930-638-24&P 12-9.   ENGINE   TROUBLESHOOTING   (cont) MALFUNCTION TEST  OR  INSPECTION CORRECTIVE ACTION 4.  ENGINE  MISFIRES  (cont) Step 4. Check for loose fuel injector nozzle. a. If a fuel injector nozzle is loose, tighten clamp. b. If fuel injector nozzles are not loose proceed to step 5 below. Step 5. Disconnect wire at fuel injection pump terminal. With ignition switch in ON position, check for +24 Vdc between wire and  chassis  ground. a. If +24 Vdc is obtained, reconnect wire to terminal and crack (open) a fuel injector line at fuel injector pump. Crank engine and check if fuel is pumped through fuel injection pump. (1) If fuel is pumped through injection pump, notify direct  support  maintenance. (2) If fuel is not pumped through fuel injection pump,  replace  it  (notify  direct  support  maintenance) b. If +24 Vdc is not obtaned, troubleshoot electrical system (para 2-19). 5. ENGINE STALLS FREQUENTLY OR DOES NOT DEVELOP FULL POWER WARNING If NBC exposure is suspected, all air filter media should be handled by personnel wearing protec- tive equipment. Consult your unit NBC Officer or NBC NCO for appropriate handling or dis- posal  procedure. Step 1. Check if air cleaner inidicator red flag is in view. a. If in view, depress reset button on top of indicator and check that red flag dis- appears from view. (If red flag does not disappear from view, replace air cleaner indicator as described in para 2–15c.) Crank engine and check if red flag is in view; if in view, service air cleaner (pars 2–15c). b. If red flag is not in view. proceed to step 2 below. 2-18 Change   5