Subaru Legacy IV (2008 year). Service manual — part 281
ME(H4DOTC)-104
Engine Trouble in General
MECHANICAL
5. Engine does not return to
idle.
Engine control system <Ref. to EN(H4DOTC)(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(H4DOTC)(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(H4DOTC)(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(H4DOTC)(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(H4DOTC)-105
Engine Trouble in General
MECHANICAL
10. Excessive fuel consump-
tion
Engine control system <Ref. to EN(H4DOTC)(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(H4DOTC)-106
Engine Noise
MECHANICAL
26.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(H4DOTC)(diag)-52, OPERATION, Clear Memory Mode.> and Inspec-
tion Mode <Ref. to EN(H4DOTC)(diag)-43, 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 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.
• Loosened flywheel mounting bolt
• Damaged engine mounting
High-pitched clank
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
between 1,000 and 2,000 rpm.
Noise 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
Noise 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 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(H4DOTC)-2
General Description
EXHAUST
1. General Description
A: COMPONENT
1. FRONT EXHAUST PIPE
(1)
Gasket
(11)
Gasket
Tightening torque:N·m (kgf-m, ft-lb)
(2)
Exhaust manifold RH upper cover
(12)
Exhaust manifold LH inner cover
T1: 19 (1.9, 14.0)
(3)
Exhaust manifold RH
(13)
Exhaust manifold LH outer cover
T2: 25 (2.5, 18.4)
(4)
Exhaust manifold RH lower cover
(14)
Gasket
T3: 40 (4.1, 29.5)
(5)
Front exhaust pipe upper cover
(15)
Turbocharger joint pipe
T4: 42.5 (4.3, 31.3)
(6)
Front exhaust pipe insulator RH
(16)
Gasket
T5: <Ref. to FU(H4DOTC)-46,
INSTALLATION, Front Oxygen
(A/F) Sensor.>
(7)
Gasket
(17)
Front oxygen (A/F) sensor
(8)
Front exhaust pipe
(18)
Exhaust manifold LH
(9)
Front exhaust pipe insulator LH
(19)
Ground cable
(10)
Front exhaust pipe lower cover
EX-02330
T1
T1
T4
T3
T4
T3
T1
T2
T1
(1)
(3)
(6)
(1)
(13)
(12)
(8)
(5)
(15)
(17)
(16)
(9)
(9)
(18)
(14)
(4)
(2)
A
A
(6)
(10)
T5
T2
T2
(7)
(11)
(19)
T4
T4
T4
T2
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