TM 5-3805-261-20FUEL SYSTEM TROUBLESHOOTING AND MAINTENANCE PROCEDURES.MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONb.ENGINE MISFIRES OR RUNS ROUGHLY.Step 5. Check engine cylinders. Loosen injection lines, one at a time to find which cylinder is misfiring (Figure 6-26).CAUTIONWhen fuel injection lines are loosened or tightened on fuel injection nozzles, two wrenches mustbe used. Nozzle must be held with wrench or damage to nozzle may result.Start and run engine at a speed which gives maximum misfiring. Refer to TM 5-380-261-10.Loosen a fuel injector line nut at fuel injection pump. This will stop flow of fuel to that cylinder.Repeat for each fuel injector line.When a cylinder is found where loosened fuel injector line nut does not make a difference in how engine runs, contactDirect Support.Figure 6-26.6-41
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