Engine Runs Rough at Idle
Cause Corrections
----------
Engine Operating in Low Ambient
Temperatures
OK
f
Refer to Cold Weather Operation,
Bulletin No. 3387266-R.
----------
Idle Characteristics of CELECT™
System Are Different Than PT System
OK
f
Normal. No correction.
----------
• Electronic Fault Codes Active
• High Counts of Inactive Fault Codes
• Coolant Temperature Sensor Malfunction-
ing
• Injector Malfunctioning
• ECM Calibration Incorrect (Does Not Have
Tone Control Feature)
OK
f
Refer to N14 CELECT™ System Trouble-
shooting and Repair Manual, Bulletin
No. 3810469.
----------
Engine Mounts Worn or Defective
OK
f
Visually check engine mounts. Refer to
Procedure 9-02 and the manufacturer’s
specifications.
----------
Engine Idle Speed Low
OK
f
Adjust idle speed. For PT fuel systems, refer
to the PT Fuel Pump Rebuild and Calibration
Manual, Bulletin No. 3379084. For CELECT™,
refer to the N14 Operation and Maintenance
Manual, Bulletin No. 3666024.
----------
Install CompuchekT, if Available
OK
f
Perform the Run Rough test and the cylinder
performance test if indicated. Refer to
CompuchekT Test Procedures Manual,
Bulletin No. 3810485.
----------
Air in the Fuel
OK
f
Check for air in the fuel. Tighten the fuel line
connections and filter(s). Check tank stand
pipe. Check PT fuel pump road speed
governor (STC only). Refer to Procedure
5-16.
(Continued)
Troubleshooting Symptoms Charts SectionT-Troubleshooting
N14Page T-54
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