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.