Jaguar XJ (X350). Service manual — part 306
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
•
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):
•
Piston ring(s) worn, damaged, sticking or worn piston/cylinder.
Action(s) to take:
•
INSTALL a new engine.
Possible Source(s):
•
Head gasket damaged.
Action(s) to take:
•
INSPECT the head gasket.
Possible Source(s):
•
Fuel system damaged or inoperative.
Action(s) to take:
•
Possible Source(s):
•
Ignition system inoperative.
Action(s) to take:
•
Poor Idling
Possible Source(s):
•
Restricted exhaust system.
Action(s) to take:
•
INSPECT the exhaust system. <<309-00>>
Possible Source(s):
•
Vacuum leak.
Action(s) to take:
•
CARRY out the Intake Manifold Vacuum Test in this section. REPAIR and INSTALL new
components as necessary.
Possible Source(s):
•
Burned valve(s).
Action(s) to take:
•
INSPECT the valve(s).
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Possible Source(s):
•
Incorrect valve to valve seat contact.
Action(s) to take:
•
INSPECT the valve and valve seat.
Possible Source(s):
•
Head gasket damaged.
Action(s) to take:
•
INSPECT the head gasket.
Possible Source(s):
•
Fuel system damaged or inoperative.
Action(s) to take:
•
Insufficient power
Possible Source(s):
•
Compression leakage from valve seat.
Action(s) to take:
•
INSPECT the valve or valve seat.
Possible Source(s):
•
Valve sticking.
Action(s) to take:
•
INSPECT valve stem to valve guide clearance or carbon accumulation.
Possible Source(s):
•
Valve spring weak or broken.
Action(s) to take:
•
INSPECT the valve spring.
Possible Source(s):
•
Head gasket damaged.
Action(s) to take:
•
INSPECT the head gasket.
Possible Source(s):
•
Cylinder head cracked or distorted.
Action(s) to take:
•
INSPECT the cylinder head.
Possible Source(s):
•
Piston ring(s) worn, damaged or sticking.
Action(s) to take:
•
INSTALL a new engine.
Possible Source(s):
•
Fuel system damaged or inoperative.
Action(s) to take:
•
Possible Source(s):
•
Brakes dragging.
Action(s) to take:
•
Possible Source(s):
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