N14 Base Engine Troubleshooting and Repair Manual – Smoke, Black — Excessive (CELECT™ or CELECT™ Plus)

Symptom Tree  t116-155

This is symptom tree t116-155
Cause Correction

Electronic fault codes active or high counts of inactive fault codes

Refer to Section TF in the Troubleshooting and Repair Manual for CELECT™
Plus Systems, 3666130, or Section TF in the Troubleshooting and Repair Manual for CELECT™ Systems, Bulletin 3666084.


Electronic control module (ECM) calibration is malfunctioning

Verify the ECM calibration is correct. Check the calibration revision history for applicable fixes to the calibration stored in the ECM. Refer to the calibration history spreadsheet Click here to see ecm_calibration_rev_history.xls

on QuickServe® Online or the INCAL™ CD-ROM. Compare the calibration stored in the ECM with the engine rating and the Control Parts List (CPL), Bulletin 4021326 or 4021327. If necessary, recalibrate the ECM. Refer to Procedure 019-032 in the Troubleshooting and Repair Manual for CELECT ™
Plus Systems, Bulletin 3666130, or the Troubleshooting and Repair Manual for CELECT™ Systems, Bulletin 3666084.


Air intake system restriction is above specification

Check the air intake system for restriction. Clean or replace the air filter and inlet piping as necessary. Refer to Procedure 010-031.


Exhaust system restriction

Check the exhaust system for any restrictions. Refer to Procedure 011-009.


Air intake or exhaust leaks

Inspect the air intake and exhaust systems for air leaks. Refer to Procedure 010-024.


Charge air cooler is restricted or leaking

Inspect the charge air cooler for air restrictions or leaks. Refer to Procedure 010-027.


Fuel drain line restriction

Check or replace the fuel lines, check valves, or tank vents as needed. Refer to Procedure 006-012.


Intake manifold pressure (boost) is below specification

Refer to the Intake Manifold Pressure (Boost) is Below Normal symptom tree.


Overhead adjustments are not correct

Measure and adjust the overhead settings. Refer to Procedure 003-004.


Injector is malfunctioning (CELECT™ and CELECT™ Plus)

Perform the automated cylinder performance test. Replace injectors as necessary. Refer to Procedures 006-005 and 006-026.


Fuel grade is not correct for the application or the fuel quality is poor

Operate the engine from a tank of high-quality fuel. Refer to Fuel for Cummins Engines, Bulletin 3379001.


Crankcase ventilation system is plugged

Check and clean the crankcase breather and vent tube. Refer to Procedures 003-001.


Turbocharger oil seal is leaking

Check the turbocharger compressor and turbine seals. Refer to Procedures 010-040 and 010-049.


Turbocharger wheel clearance is out of specification

Check the radial bearing clearance and axial clearance. Inspect the turbocharger. Repair or replace the turbocharger if necessary. Refer to Procedures 010-038 and 010-047.


Fuel rate is low, fuel pressure is okay, intake manifold pressure is high, and ambient air temperature is below 0°C [32° F]

No corrections are required. This is normal performance at temperatures below 0°C [32° F].


Static injection timing is not correct

Check the static injection timing. Refer to Procedure 006-025.


Crankcase pressure is excessive

Check for excessive blowby. Refer to the Crankcase Gases (Blowby) Excessive symptom tree.

Last Modified:  20-Jan-2004