Subaru Legacy IV (2008 year). Service manual — part 76
ME(H4SO)-100
Engine Trouble in General
MECHANICAL
5. Engine does not return to
idle.
Engine control system <Ref. to EN(H4SO)(diag)-2, Basic Diagnostic Procedure.>
A
Intake system
Loosened or cracked vacuum hose
A
Others
Stuck or damaged throttle valve
A
6. Dieseling (Run-on)
Engine control system <Ref. to EN(H4SO)(diag)-2, Basic Diagnostic Procedure.>
A
Cooling system
Over-heating
B
Others
Evaporative emission control system malfunction
B
7. After burning in exhaust
system
Engine control system <Ref. to EN(H4SO)(diag)-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
Timing belt
Defective timing
B
Compression
Incorrect valve clearance
B
Loosened spark plug or defective gasket
C
Loosened cylinder head bolt or defective gasket
C
Improper valve sealing
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
Evaporative emission control system malfunction
C
8. Knocking
Engine control system <Ref. to EN(H4SO)(diag)-2, Basic Diagnostic Procedure.>
A
Intake system
Loosened oil filler cap
B
Timing belt
Defective timing
B
Compression
Incorrect valve clearance
C
Incorrect valve timing
B
Cooling system
Over-heating
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 gas-
ket
B
Defective oil filter gasket
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
Symptoms
Problem parts etc.
Possible cause
RANK
ME(H4SO)-101
Engine Trouble in General
MECHANICAL
10. Excessive fuel consump-
tion
Engine control system <Ref. to EN(H4SO)(diag)-2, Basic Diagnostic Procedure.>
A
Intake system
Dirty air cleaner element
A
Timing belt
Defective timing
B
Compression
Incorrect valve clearance
B
Loosened spark plug or defective gasket
C
Loosened cylinder head bolt or defective gasket
C
Improper valve sealing
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
Symptoms
Problem parts etc.
Possible cause
RANK
ME(H4SO)-102
Engine Noise
MECHANICAL
28.Engine Noise
A: INSPECTION
NOTE*)
When disconnecting the fuel injector connector, the malfunction indicator light illuminates and DTC is stored in ECM memory.
Therefore, perform the Clear Memory Mode <Ref. to EN(H4SO)(diag)-50, OPERATION, Clear Memory Mode.> and Inspection
Mode <Ref. to EN(H4SO)(diag)-41, PROCEDURE, Inspection Mode.> after connecting the 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 (large end)
Oil pressure is normal.
• Damaged engine mounting
• Loosened flywheel mounting bolt
High-pitched clank (Spark
knock)
Sound is noticeable when
accelerating with an overload
condition.
• Ignition timing advanced
• Accumulation of carbon inside combustion chamber
• Wrong heat range of spark plug
• Improper octane value of gasoline
Clank when engine speed is
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 connecting rod bearing (large end)
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*)
• Worn cam sprocket
• Worn camshaft journal bore in cylinder head
Squeaky sound
—
Insufficient generator lubrication
Rubbing sound
—
Poor contact of generator brush and rotor
Gear scream when starting
engine
—
• Defective ignition starter switch
• Worn gear and starter pinion
Sound like polishing glass with
a dry cloth
—
• Loose V-belt
• Defective water pump shaft
Hissing sound
—
• Insufficient compression
• Air leakage in air intake system, hose, connection or manifold
Timing belt noise
—
• Loose timing belt
• Timing belt contacting with adjacent part
Valve noise
—
Incorrect valve clearance
EX(H4SO)-2
General Description
EXHAUST
1. General Description
A: COMPONENT
T2
T2
T2
T2
T6
T7
T5
T2
T2
T6
T6
(27)
(26)
(21)
(17)
(15)
(14)
(10)
(11)
(13)
(12)
(22)
(28)
(25)
(24)
(23)
T3
T4
T2
T4
T9
T9
(5)
(9)
(5)
(5)
(4)
(3)
(5)
(5)
(2)
(8)
(16)
(18)
(7)
(6)
(7)
(6)
(1)
(20)
T8
(20)
(31)
(30)
(19)
T2
EX-02365
(29)
(29)
T1
T1
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