TM 10-3930-659-10 Table 3-1.  Troubleshooting (Con’t). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 2.  ENGINE TURNS OVER BUT WILL NOT START. Step 1.  Check fuel level on fuel gage with ignition switch In ON position. If empty, fill tank. Step 2.  Check for obstruction of fuel tank cap vent. Loosen fuel tank cap and crank engine.  If engine starts, notify  Unit Maintenance. Step 3.  Check for restricted air cleaner. Check engine air filter restriction indicator.  If indicator light is  on, clean primary air filter element (see paragraph 3-11) and air  inlet cover. Step 4.  Engine turns over slowly. Notify Unit Maintenance. 3.  ENGINE STARTS BUT DOES NOT CONTINUE TO RUN. Check fuel gage with ignition switch in ON position. If empty, fill fuel tank. If fuel is present, notify Unit Maintenance. 4.  ENGINE EMITS EXCESSIVE BLACK OR GRAY EXHAUST SMOKE. Check engine air filter restriction Indicator. If indicator light is on, clean primary air filter element (see paragraph 3-11). 5.  ENGINE EMITS EXCESSIVE BLUE OR WHITE EXHAUST SMOKE. Check engine coolant level in see-through coolant recovery tank. Allow engine to warm up to operating temperature.  If engine fails to reach full operating temperature, notify Unit Maintenance. 3-5