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Table 11.
Hard Starting Symptoms and Probable Causes
Probable Causes
Engine Will Not
Rotate
Low Cranking
Speed
Engine Cranks
But Will Not
Start
Low Battery Voltage
X
X
—
Loose cranking motor
connections
X
—
—
Faulty cranking motor
X
X
—
Faulty cranking motor switch
X
X
X
Internal seizure
X
—
—
Improper lubricating oil
—
X
—
Circuit breaker/electronic control
malfunction
—
—
X
Fuse blown or missing
—
—
X
Insufficient Fuel Supply
Air in fuel
—
—
X
Out of fuel
—
—
X
Loose fuel connections
—
—
X
Cracked fuel lines
—
—
X
Obstructed fuel filters/lines
—
—
X
Faulty fuel pumps
—
—
X
Faulty injector operation
—
—
X
Restricted fuel fitting missing
—
—
X
DDEC Malfunction
—
—
X
Installation/operation of fuel
check valve or shutoff valve
—
—
X
Low Compression
Worn intake and exhaust valves
—
—
X
Worn piston rings/liners
—
—
X
Leaking cylinder head gasket
—
—
X
Improper intake or exhaust valve
adjustments
—
—
X
Abnormal Engine Operation
This section explains Abnormal Engine Operation Symptoms and Probable Causes
Troubleshooting
104
All information subject to change without notice.
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DDC-SVC-MAN-0175