TM 5-3805-261-34ENGINE TROUBLESHOOTING AND MAINTENANCE PROCEDURES.MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONc.ENGINE STALLS AT A LOW RPM.Step 1.Check the idle.If the idle is not correct--adjust. Refer to paragraph 3-27.Step 2.Check the fuel injection valves and pumps. Run the engine at an RPM that causes rough running. Loosen a fuel line nut on the injection valve of each cylinder.If the loosening of a fuel line nut does not make a difference--replace injection valve. Refer to paragraph 3-25.d.SUDDEN CHANGES IN ENGINE SPEED.Check the governor and fuel injection pump.If the springs, linkage or other parts are damaged or defective--replace. Refer to paragraph 3-25.e.NOT ENOUGH POWER.Step 1.Check the fuel pressure at the fuel injection pump housing. Fuel pressure at high idle should be 15 psi.If the fuel pressure is below 15 psi--replace fuel filter element.If the fuel pressure is still low--proceed to Step 2.Step 2.Check the fuel bypass and check valves in the fuel transfer pump.If the bypass or check valves are damaged or defective--replace. Refer to paragraph 3-29.3-5
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