Subaru Legacy (2005 year). Manual — part 404
ME(H6DO)-91
MECHANICAL
Engine Trouble in General
7. After burning in exhaust
system
Engine control system <Ref. to EN(H6DO)(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
Chain
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
Trouble of tappet
C
Trouble of tappet. In case noise occurs with valve mov-
ing. Or the harness involved to oil switching solenoid
valve, variable valve lift diagnosis oil pressure switch
and variable valve lift has trouble in a past.
B
Lubrication system
Incorrect oil pressure
C
Cooling system
Over-cooling
C
Other
Evaporative emission control system malfunction
C
8. Knocking
Engine control system <Ref. to EN(H6DO)(diag)-2, Basic Diagnostic Procedure.>
A
Intake system
Loosened oil filler cap
B
Chain
Defective timing
B
Compression
Incorrect valve clearance
C
Incorrect valve timing
B
Trouble of tappet
C
Trouble of tappet. In case noise occurs with valve mov-
ing. Or the harness involved to oil switching solenoid
valve, variable valve lift diagnosis oil pressure switch
and variable valve lift has trouble in a past.
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 gas-
ket
B
Defective oil filter o-ring
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
Symptom
Problem parts, etc.
Possible cause
Rank
ME(H6DO)-92
MECHANICAL
Engine Trouble in General
10. Excessive fuel consump-
tion
Engine control system <Ref. to EN(H6DO)(diag)-2, Basic Diagnostic Procedure.>
A
Intake system
Dirty air cleaner element
A
Chain
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
Trouble of tappet
C
Trouble of tappet. In case noise occurs with valve mov-
ing. Or the harness involved to oil switching solenoid
valve, variable valve lift diagnosis oil pressure switch
and variable valve lift has trouble in a past.
B
Lubrication system
Incorrect oil pressure
C
Cooling system
Over-cooling
C
Symptom
Problem parts, etc.
Possible cause
Rank
ME(H6DO)-93
MECHANICAL
Engine Noise
30.Engine Noise
A: INSPECTION
NOTE*)
When disconnecting the fuel injector connector, the malfunction indicator light illuminates and DTC is stored in ECM memory.
Therefore, carry out the clear memory mode <Ref. to EN(H6DO)(diag)-41, OPERATION, Clear Memory Mode.> and inspection
mode <Ref. to EN(H6DO)(diag)-34, PROCEDURE, Inspection Mode.> after connecting the fuel injector connector.
Type of sound
Condition
Possible cause
Regular clicking sound
Sound increases as engine
speed increases.
• Defective valve mechanism
• Incorrect valve clearance
• Worn valve rocker
• Worn camshaft
• Broken valve spring
• Trouble of tappet
Heavy and dull clank
Oil pressure is low.
• Worn camshaft main bearing
• Worn connecting rod bearing (large end)
Oil pressure is normal.
Damaged engine mounting
High-pitched clank
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
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
—
• Insufficient compression
• Air leakage in air intake system, hoses, connections or mani-
folds
Timing belt noise
—
• Loose timing belt
• Belt contacting with case/adjacent part
Valve tappet noise
—
• Incorrect valve clearance
• Trouble of tappet
ME(H6DO)-94
MECHANICAL
Engine Noise
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