CUMMINS N14 - Engine Speed Surges at Low Idle (Continued)

Engine Speed Surges at Low Idle (Continued)
Cause Corrections
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Automotive and VS governor Low Idle
Speeds Set Too Close
OK
f
Adjust automotive idle speed. Adjust VS idle
speed. Refer to Procedure 5-05 and the PT
Fuel Pump Rebuild and Calibration Manual,
Bulletin No. 3379084.
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Air in the Fuel
OK
f
Check for air in the fuel. Tighten fuel
connections. Tighten filter(s). Check tank
stand pipe. Check PT fuel pump road speed
governor (STC only). Refer to Procedure
5-16.
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Fuel Inlet Restriction Excessive
OK
f
To check restriction, refer to Procedure 5-01.
Replace fuel filter element or damaged/
improperly sized fuel inlet plumbing. Refer to
N14 CELECT™ System Troubleshooting and
Repair Manual, Bulletin No. 3810469.
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Fuel Drain Line Restriction Excessive
OK
f
Check for loops, restricted fittings, lines, and
tank vents. Refer to Procedure 5-19 for PT
engines. For CELECT™ engines, refer to N14
CELECT™ System Troubleshooting and
Repair Manual, Bulletin No. 3810469.
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Fuel Drain in Cylinder Head Blocked
OK
f
Check and clean passage.
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Injector Malfunctioning
OK
f
Perform injector cut out test to isolate faulty
injector. Refer to Procedure 5-15 for PT
engines. For CELECT™ engines, refer to the
N14 CELECT™ System Troubleshooting and
Repair Manual, Bulletin No. 3810469.
----------
PT Fuel Pump Assembled or Adjusted
Incorrectly
OK
f
Repair or replace fuel pump. Check:
• Throttle leakage set incorrectly
• Incorrect idle parts
• Low idle governor
Refer to the PT Fuel Pump Rebuild and
Calibration Manual, Bulletin No. 3379084 for
calibration specifications.
Troubleshooting Symptoms Charts SectionT-Troubleshooting
N14Page T-62