Subaru Legacy III (2000-2003 year). Service manual — part 70
ME(H4SO)-92
MECHANICAL
ENGINE TROUBLE IN GENERAL
5. Engine does not return to
idle.
• Engine control system <Ref. to EN(H4SO)-2, Basic Diagnostic Procedure.>
A
• Intake system
• Loosened or cracked vacuum hose
A
• Others
• Stuck or damaged throttle valve
A
• Accelerator cable out of adjustment
B
6. Dieseling (Run-on)
• Engine control system <Ref. to EN(H4SO)-2, Basic Diagnostic Procedure.>
A
• Cooling system
• Overheating
B
• Others
• Malfunction of evaporative emission control system
B
7. After burning in exhaust
system
• Engine control system <Ref. to EN(H4SO)-2, Basic Diagnostic Procedure.>
A
• Intake system
• Loosened or cracked intake duct
C
• Loosened or cracked PCV hose
C
• Loosened or cracked vacuum hose
B
• Defective PCV valve
B
• Loosened oil filler cap
C
• Belt
• Defective timing
B
• Compression
• Incorrect valve clearance
B
• Loosened spark plugs or defective gasket
C
• Loosened cylinder head bolts or defective gasket
C
• Improper valve seating
B
• Defective valve stem
C
• Worn or broken valve spring
C
• Worn or stuck piston rings, cylinder and piston
C
• Incorrect valve timing
A
• Lubrication system
• Incorrect oil pressure
C
• Cooling system
• Over cooling
C
• Others
• Malfunction of evaporative emission control system
C
8. Knocking
• Engine control system <Ref. to EN(H4SO)-2, Basic Diagnostic Procedure.>
A
• Intake system
• Loosened oil filler cap
B
• Belt
• Defective timing
B
• Compression
• Incorrect valve clearance
C
• Incorrect valve timing
B
• Cooling system
• Overheating
A
9. Excessive engine oil con-
sumption
• Intake system
• Loosened or cracked PCV hose
A
• Defective PCV valve
B
• Loosened oil filler cap
C
• Compression
• Defective valve stem
A
• Worn or stuck piston rings, cylinder and piston
A
• Lubrication system
• Loosened oil pump attaching bolts and defective
gasket
B
• Defective oil filler seal
B
• Defective crankshaft oil seal
B
• Defective rocker cover gasket
B
• Loosened oil drain plug or defective gasket
B
• Loosened oil pan fitting bolts or defective oil pan
B
TROUBLE
PROBLEM PARTS, ETC.
POSSIBLE CAUSE
RANK
ME(H4SO)-93
MECHANICAL
ENGINE TROUBLE IN GENERAL
10. Excessive fuel consump-
tion
• Engine control system <Ref. to EN(H4SO)-2, Basic Diagnostic Procedure.>
A
• Intake system
• Dirty air cleaner element
A
• Belt
• Defective timing
B
• Compression
• Incorrect valve clearance
B
• Loosened spark plugs or defective gasket
C
• Loosened cylinder head bolts or defective gasket
C
• Improper valve seating
B
• Defective valve stem
C
• Worn or broken valve spring
C
• Worn or stuck piston rings, cylinder and piston
B
• Incorrect valve timing
B
• Lubrication system
• Incorrect oil pressure
C
• Cooling system
• Over cooling
C
• Others
• Accelerator cable out of adjustment
B
TROUBLE
PROBLEM PARTS, ETC.
POSSIBLE CAUSE
RANK
ME(H4SO)-94
MECHANICAL
ENGINE NOISE
23.Engine Noise
A: INSPECTION
NOTE*:
When disconnecting fuel injector connector, Malfunction Indicator Light (CHECK ENGINE light) illuminates and trouble code is
stored in ECM memory.
Therefore, carry out the CLEAR MEMORY MODE <Ref. to EN(H4SO)-47, Clear Memory Mode.> and INSPECTION MODE
<Ref. to EN(H4SO)-40, Inspection Mode.> after connecting fuel injector connector.
Type of sound
Condition
Possible cause
Regular clicking sound
Sound increases as engine
speed increases.
• Valve mechanism is defective.
• Incorrect valve clearance
• Worn valve rocker
• Worn camshaft
• Broken valve spring
Heavy and dull clank
Oil pressure is low.
• Worn crankshaft main bearing
• Worn connecting rod bearing (big end)
Oil pressure is normal.
• Loose flywheel mounting bolts
• Damaged engine mounting
High-pitched clank (Spark
knock)
Sound is noticeable when
accelerating with an overload.
• Ignition timing advanced
• Accumulation of carbon inside combustion chamber
• Wrong spark plug
• Improper gasoline
Clank when engine speed is
medium (1,000 to 2,000 rpm).
Sound is reduced when fuel
injector connector of noisy cyl-
inder is disconnected.
(NOTE*)
• Worn crankshaft main bearing
• Worn bearing at crankshaft end of connecting rod
Knocking sound when engine
is operating under idling speed
and engine is warm
Sound is reduced when fuel
injector connector of noisy cyl-
inder is disconnected.
(NOTE*)
• Worn cylinder liner and piston ring
• Broken or stuck piston ring
• Worn piston pin and hole at piston end of connecting rod
Sound is not reduced if each
fuel injector connector is dis-
connected in turn. (NOTE*)
• Unusually worn valve lifter
• Worn cam gear
• Worn camshaft journal bore in crankcase
Squeaky sound
—
• Insufficient generator lubrication
Rubbing sound
—
• Defective generator brush and rotor contact
Gear scream when starting
engine
—
• Defective ignition starter switch
• Worn gear and starter pinion
Sound like polishing glass with
a dry cloth
—
• Loose drive belt
• Defective water pump shaft
Hissing sound
—
• Loss of compression
• Air leakage in air intake system, hoses, connections or mani-
folds
Timing belt noise
—
• Loose timing belt
• Belt contacting case/adjacent part
Valve tappet noise
—
• Incorrect valve clearance
EXHAUST
EX(H4SO)
Page
General Description . . . . . . . . . . . . . . . . . . . . . 2
Front Exhaust Pipe. . . . . . . . . . . . . . . . . . . . . ..5
Center Exhaust Pipe . . . . . . . . . . . . . . . . . . . . ...8
Rear Exhaust Pipe . . . . . . . . . . . . . . . . . . . . . ..9
Muffler . . . . . . . . . . . . . . . . . . . . . . . . . ...10
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