Rough Idle, Warm Engine
| Cause | Correction |
|---|---|
| Idle Speed Too Low | Check / adjust low idle screw setting. |
OK | |
| Air in Fuel System | Bleed the fuel system and check for suction leaks. |
| OK | |
| Malfunctioning Fuel Return Overflow Valve | Check / replace fuel return overflow valve. |
| OK | |
| Fuel Transfer Pump Malfunctioning | Check / replace fuel transfer pump. |
| OK | |
| Injection Pump Timing Incorrect | Check / correct injection pump timing. |
| OK | |
| Injector Nozzles Plugged or Inoperative | Replace injectors. |
| OK | |
| Broken Engine Mounts | Replace engine mounts. |
| OK | |
| Injection Pump Worn or Malfunctioning | Remove injection pump, check calibration. |
