Subaru Legacy IV (2008 year). Service manual — part 490
ME(H6DO)-86
Engine Trouble in General
MECHANICAL
3) Initial combustion occurs.
Engine control system <Ref. to EN(H6DO)(diag)-2, Basic Diagnostic Procedure.>
A
Intake system
Defective intake manifold gasket
B
Defective throttle body gasket
B
Fuel line
Defective fuel pump and relay
C
Clogged fuel line
C
Lack of or insufficient fuel
B
Timing chain
Trouble
B
Defective timing
B
Compression
Incorrect valve clearance
C
Loosened spark plug or defective gasket
C
Loosened cylinder head bolt or defective gasket
C
Improper valve sealing
C
Defective valve stem
C
Worn or broken valve spring
B
Worn or stuck piston rings, cylinder and piston
C
Incorrect valve timing
B
Improper engine oil (low viscosity)
B
Trouble of valve lifter
C
Trouble of valve lifter. (In case noise occurs with valve
moving. Or the harness involved to oil switching sole-
noid valve, variable valve lift diagnosis oil pressure
switch and variable valve lift has trouble in a past.)
B
4) Engine stalls after initial
combustion.
Engine control system <Ref. to EN(H6DO)(diag)-2, Basic Diagnostic Procedure.>
A
Intake system
Loosened or cracked intake duct
B
Loosened or cracked PCV hose
C
Loosened or cracked vacuum hose
C
Defective intake manifold gasket
B
Defective throttle body gasket
B
Dirty air cleaner element
C
Fuel line
Clogged fuel line
C
Lack of or insufficient fuel
B
Timing chain
Trouble
B
Defective timing
B
Compression
Incorrect valve clearance
C
Loosened spark plug or defective gasket
C
Loosened cylinder head bolt or defective gasket
C
Improper valve sealing
C
Defective valve stem
C
Worn or broken valve spring
B
Worn or stuck piston rings, cylinder and piston
C
Incorrect valve timing
B
Improper engine oil (low viscosity)
B
Trouble of valve lifter
C
Trouble of valve lifter. (In case noise occurs with valve
moving. Or the harness involved to oil switching sole-
noid valve, variable valve lift diagnosis oil pressure
switch and variable valve lift has trouble in a past.)
B
Symptoms
Problem parts etc.
Possible cause
RANK
ME(H6DO)-87
Engine Trouble in General
MECHANICAL
2. Rough idle and engine
stall
Engine control system <Ref. to EN(H6DO)(diag)-2, Basic Diagnostic Procedure.>
A
Intake system
Loosened or cracked intake duct
A
Loosened or cracked PCV hose
A
Loosened or cracked vacuum hose
A
Defective intake manifold gasket
B
Defective throttle body gasket
B
Defective PCV valve
C
Loosened oil filler cap
B
Dirty air cleaner element
C
Fuel line
Defective fuel pump and relay
C
Clogged fuel line
C
Lack of or insufficient fuel
B
Timing chain
Defective timing
C
Compression
Incorrect valve clearance
B
Loosened spark plug or defective gasket
B
Loosened cylinder head bolt or defective gasket
B
Improper valve sealing
B
Defective valve stem
C
Worn or broken valve spring
B
Worn or stuck piston rings, cylinder and piston
B
Incorrect valve timing
A
Improper engine oil (low viscosity)
B
Trouble of valve lifter
C
Trouble of valve lifter. (In case noise occurs with valve
moving. Or the harness involved to oil switching sole-
noid valve, variable valve lift diagnosis oil pressure
switch and variable valve lift has trouble in a past.)
B
Lubrication system
Incorrect oil pressure
B
Defective rocker cover gasket
C
Cooling system
Over-heating
C
Others
Evaporative emission control system malfunction
A
Stuck or damaged throttle valve
B
Symptoms
Problem parts etc.
Possible cause
RANK
ME(H6DO)-88
Engine Trouble in General
MECHANICAL
3. Low output, hesitation and
poor acceleration
Engine control system <Ref. to EN(H6DO)(diag)-2, Basic Diagnostic Procedure.>
A
Intake system
Loosened or cracked intake duct
A
Loosened or cracked PCV hose
A
Loosened or cracked vacuum hose
B
Defective intake manifold gasket
B
Defective throttle body gasket
B
Defective PCV valve
B
Loosened oil filler cap
B
Dirty air cleaner element
A
Fuel line
Defective fuel pump and relay
B
Clogged fuel line
B
Lack of or insufficient fuel
C
Timing chain
Defective timing
B
Compression
Incorrect valve clearance
B
Loosened spark plug or defective gasket
B
Loosened cylinder head bolt or defective gasket
B
Improper valve sealing
B
Defective valve stem
C
Worn or broken valve spring
B
Worn or stuck piston rings, cylinder and piston
C
Incorrect valve timing
A
Improper engine oil (low viscosity)
B
Trouble of valve lifter
C
Trouble of valve lifter. (In case noise occurs with valve
moving. Or the harness involved to oil switching sole-
noid valve, variable valve lift diagnosis oil pressure
switch and variable valve lift has trouble in a past.)
B
Lubrication system
Incorrect oil pressure
B
Cooling system
Over-heating
C
Over-cooling
C
Others
Evaporative emission control system malfunction
A
Symptoms
Problem parts etc.
Possible cause
RANK
ME(H6DO)-89
Engine Trouble in General
MECHANICAL
4. Surging
Engine control system <Ref. to EN(H6DO)(diag)-2, Basic Diagnostic Procedure.>
A
Intake system
Loosened or cracked intake duct
A
Loosened or cracked PCV hose
A
Loosened or cracked vacuum hose
A
Defective intake manifold gasket
B
Defective throttle body gasket
B
Defective PCV valve
B
Loosened oil filler cap
B
Dirty air cleaner element
B
Fuel line
Defective fuel pump and relay
B
Clogged fuel line
B
Lack of or insufficient fuel
C
Timing 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
C
Defective valve stem
C
Worn or broken valve spring
C
Worn or stuck piston rings, cylinder and piston
C
Incorrect valve timing
A
Improper engine oil (low viscosity)
B
Trouble of valve lifter
C
Trouble of valve lifter. (In case noise occurs with valve
moving. Or the harness involved to oil switching sole-
noid valve, variable valve lift diagnosis oil pressure
switch and variable valve lift has trouble in a past.)
B
Cooling system
Over-heating
B
Others
Evaporative emission control system malfunction
C
5. Engine does not return to
idle.
Engine control system <Ref. to EN(H6DO)(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(H6DO)(diag)-2, Basic Diagnostic Procedure.>
A
Cooling system
Over-heating
B
Others
Evaporative emission control system malfunction
B
Symptoms
Problem parts etc.
Possible cause
RANK
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