2004 SUBARU FORESTER fuel

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SUBARU FORESTER 2004 Service Repair Manual ME(H4DOTC)-123
MECHANICAL
Engine Noise
26.Engine Noise
A: INSPECTION
NOTE*:
When disconnecting the fuel injector connector, Malfunction Indicator Light illuminates and DTC is stored in
ECM memory.
The

ME(H4DOTC)-123
MECHANICAL
Engine Noise
26.Engine Noise
A: INSPECTION
NOTE*:
When disconnecting the fuel injector connector, Malfunction Indicator Light illuminates and DTC is stored in
ECM memory.
Therefore, carry out the CLEAR MEMORY MODE Mode.> and INSPECTION MODE after con-
necting the fuel injector connector.
Type of sound Condition Possible cause
Regular clicking soundSound increases as engine
speed increases. Valve mechanism is defective.
Incorrect valve clearance
Worn valve rocker
Worn camshaft
Broken valve spring
Heavy and dull clankOil 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 heat range of spark plug
Improper octane number of 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 warmSound 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