5 HARD START AND NO START DIAGNOSTICS 147
• Cylinder mechanical lock (timing incorrect;
valve/piston contact)
Insufficient rpm
• Low battery power
• Starter motor problem
• Incorrect oil viscosity
• Cold temperature
Insufficient oil pressure
• Oil gauge error on instrument panel (will not cause
hard start or no start)
• Low oil level: oil leak, oil consumption, or incorrect
servicing
• High oil level: in co rrect servicing, fuel in oil,
coolant in oil
• Incorrect oil viscosity
• Stuck oil pressure regulator
• Scored or damaged oil pump/front cover
• Engine Oil P re ssure (EOP) sens or biased
• Incorrect EOP sensor
• EOP circuit or sensor problems
• Broken, missing, or loose piston cooling tubes
• Missing, damaged, or worn bearing inserts
• Missing, damaged, or worn camshaft bushings
• Lifter missing (will also have performance
problems)
Excessive exhaust smoke with hard start or no
start concern
• Poor fuel quality
• Insufficient cylinder temperature
• Loose injector
•Lowcompression
• Inoperable inlet air heater system – if equipped
• Excessive air inlet or exhaust restriction
• Damaged injector – split tip
• Base engine t iming incorrect
• Combustion leak to fuel
No exhaust smoke / cylinders not receiving fuel
• Fuel supply system concern
• ECM an d IDM comm u nication failure
• ICP sensor bias high (above 3.45 MPa [500 psi])
• Combustion leak to fuel supply (fuel rail)
• Base engine t iming incorrect
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
©August 2008 Navistar, Inc.
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