(Table 71, contd)
Troubleshooting Test Steps
Values Results
8. Pistons and Connecting Rods
A. Inspect the pistons for damage and wear.
B. Inspect the connecting rod bearings for damage and wear.
Pistons and
connecting
rods
Result: One or more components are worn or damaged.
Replace any worn or damaged parts.
Verify that the repair has eliminated the noise.
Result: All components are OK.
Proceed to Test Step 9.
9. Crankshaft
A. Inspect the crankshaft and the related components. Look for
worn thrust plates and wear on the crankshaft.
B. Inspect the connecting rod bearings and the bearing surfaces
on the crankshaft. Make sure that the bearings are in the correct
position.
Crankshaft Result: The crankshaft or the related components are dam-
aged or worn.
Repair: Repair or replace any damaged parts. Verify that
the repair eliminated the fault.
Result: All components are OK.
Contact the Dealer Solutions Network (DSN).
i06888404
Engine Misfires, Runs Rough
or Is Unstable
Note: If the fault is intermittent and the fault cannot
be duplicated, refer to Troubleshooting, “Power Is
Intermittently Low or Power Cutout Is Intermittent”.
Note: If the fault only occurs under certain
conditions, test the engine under those conditions.
Examples of certain conditions are high rpm, full
load, and engine operating temperature.
Troubleshooting the symptoms under other
conditions can give misleading results.
Probable Causes
• Diagnostic codes
• Fuel supply
• Transfer Pump Inlet Regulator (TPIR)
• Electric Fuel Lift Pump (EFLP)
• Return fuel lines
• Throttle position sensor
• CAN data link
• High-pressure fuel pump
• Low compression (cylinder pressure)
• Electronic unit injectors
• Individual malfunctioning cylinder
Recommended Actions
Note: The procedures have been listed in order of
probability. Complete the procedures in order.
UENR4469-36 147
Symptom Troubleshooting
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