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Diagnosis and testing
Engine - 3.0L/3.5L/4.2L Inspection and Verification Since diagnosis and testing actually begins when repairs are taken on, the following procedure is recommended.
1 . Verify the customer concern by operating the system.
2 . Visually inspect for obvious signs of mechanical damage or electrical damage. If the concern cannot be reproduced, carry out a road test and/or visual check with the aid of the following table. Mechanical
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Coolant leaks •
Oil leaks •
Leaks in the fuel system •
Visibly damaged or worn parts •
Loose or missing nuts or bolts
3 . If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4 . If the concern is not visually evident, verify the symptom and refer to the Symptom Chart. Symptom Chart Difficult to start during hot or cold start
Possible Source(s):
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Piston ring(s) worn, damaged, sticking or worn piston/cylinder.
Action(s) to take:
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INSTALL a new engine.
Possible Source(s):
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Head gasket damaged.
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