Engine Runs Rough or Misfires
Cause Corrections
----------
Condition Only Occurs at Idle
OK
f
Refer to the troubleshooting symptom
chart ‘‘Rough Idle.’’
----------
Engine Operating in Low Ambient
Temperature
OK
f
Refer to Cold Weather Operation,
Bulletin No. 3387266-R.
----------
• Electronic Fault Codes Active
• High Counts of Inactive Fault Codes
OK
f
Refer to N14 CELECT™ System Trouble-
shooting and Repair Manual, Bulletin No.
3810469.
----------
ECM Calibration Incorrect
OK
f
Check fuel calibration data stored in the
ECM with engine rating. Compulink™
required.
----------
Fuel Grade Incorrect or Fuel Quality Poor
OK
f
Verify by operating the engine with
clean fuel from a temporary tank.
----------
Air in the Fuel
OK
f
Check for air in the fuel. Tighten the fuel line
connections and fuel filter(s). Check tank
stand pipe. Check PT fuel pump road speed
governor (STC only). Refer to Procedure
5-16.
----------
Fuel Supply Line Restriction Excessive
OK
f
Check for plugged fuel filter and/or excessive
fuel supply line restriction. Refer to Proce-
dure 5-01 for PT engines. For CELECT™
engines, refer to N14 CELECT™ System
Troubleshooting and Repair Manual, Bulletin
No. 3810469.
----------
Compression in One or More Cylinders Low
OK
f
Perform a CompuchekT compression check
and power balance test and repair as
required. Refer to CompuchekT Test Proce-
dures Manual, Bulletin No. 3810485.
(Continued)
SectionT-Troubleshooting Troubleshooting Symptoms Charts
N14 Page T-57
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