TM 10-3930-664-10 MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 3. ENGINE HARD TO START OR WILL NOT START (EXHAUST SMOKE PRESENT) Step 1 Check the ambient temperature. Use the cold start push button when the ambient temperature Is 32° F 0° C) or lower. (Refer to para 2-20) Step 2. Check air cleaner restriction indicator to see if red flag shows (indicates that air cleaner is clogged ) Service the air cleaner.  (Refer to para 3-10.) Step 3. Check to see if any fuel lines are damaged. Report damaged fuel lines to Organizational Maintenance. 4. ENGINE STARTS BUT WILL NOT RUN Step 1. Check fuel/water separator for water. Drain fuel/water separator.  (Refer to para 3-9.) Step 2. Check to see if any fuel lines are damaged. Report damaged fuel lines to Organizational Maintenance. 5. ENGINE MISFIRES OR RUNS ROUGH Step 1. Check to see if fuel tank is low or empty. WARNING Do not fill the tank with the engine running, while smoking, or when near an open flame.  Never overfill the tank or spill fuel.  If fuel is spilled, clean it up immediately.  Be sure to use the correct type and grade of fuel. Fill fuel tank. Step 2. Check to see if any moisture is present in water separator. Drain the water separator.  (Refer to para.  3-9.) Step 3. Check for black or gray exhaust smoke.  Plugged or dirty intake system. Service air cleaner.  (Refer to para 3-10). Step 4. Check for white or blue smoke.  Indicates engine is cold. Allow engine to warm up. 3-4