ARMY TM 9-2815-253-24 AIR FORCE TO 38G1-93-2 MARINE CORPS TM 2815-24/3 Table 3-2.  Troubleshooting  Continued MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Step 3.  Check for air in fuel system lines. Prime fuel system at fuel filter.  Refer to paragraph 3-12.  If fuel system is free of air, do Step 4. Step 4.  Check for fuel injector nozzles dirty or faulty. a.  Remove and test fuel injectors.  Refer to paragraph 3-17.  If not defective, do Step 5. b.  Replace fuel injector(s).  Refer to paragraph 3-17. Step 5.  Check for improper fuel pump timing. a.  Check fuel pump timing.  Refer to paragraph 3-14.  If fuel pump timing is correct, do Step 6. b.  Adjust fuel pump timing.  Refer to paragraph 3-14. Step 6.  Check for defective fuel injection pumps. a.  Test fuel injection pumps.  Refer to paragraph 3-13.3. b.  Replace defective fuel injection pumps.  Refer to paragraph 3-13. 4.  ENGINE HARD TO START OR WILL NOT START IN COLD WEATHER. Step 1.  Check for faulty heater plugs. a.  Test heater plugs.  Refer to paragraph 3-.2.  If heater plugs not defective, do Step 2. b.  Replace defective heater plug(s).  Refer to paragraph 3-6. Step 2.  Refer to Malfunction 3 and perform Step 1 through Step 6. 5.  ENGINE MISFIRES OR RUNS IRREGULARLY OR STALLS FREQUENTLY. Step 1.  Check for air in fuel system lines. Prime fuel system at fuel filter.  Refer to paragraph 3-12.  If no air, do Step 2. Step 2.  Check for clogged fuel filter. Refer to paragraph 3-16 for inspection.  If not clogged, do Step 3. Step 3.  Check for defective governor system. Adjust governor system.  Refer to paragraph 3-23.5.  If properly adjusted, do Step 4. Step 4.  Check for low coolant temperature. a.  If coolant temperature not low, do Step 5. b.  Replace defective thermostat.  Refer to paragraph 3-9. Step 5.  Check for fuel injector nozzles dirty, defective or leaking. a.  Remove and test fuel injectors.  Refer to paragraph 3-17.  If not defective, do Step 6. b.  Replace fuel injector nozzle(s).  Refer to paragraph 3-17. 3-3