Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 181
ME(w/o STI)-105
Engine Trouble in General
MECHANICAL
2. Rough idle and engine
stall
Engine control system <Ref. to EN(H4DOTC)(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 fuel or insufficient fuel
B
Timing belt
Defective timing
C
Compression
Incorrect valve clearance
B
Loosened spark plug or defective gasket
B
Loosened cylinder head bolt or defective cylinder head
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
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(w/o STI)-106
Engine Trouble in General
MECHANICAL
3. Low output, hesitation and
poor acceleration
Engine control system <Ref. to EN(H4DOTC)(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 fuel or insufficient fuel
C
Timing belt
Defective timing
B
Compression
Incorrect valve clearance
B
Loosened spark plug or defective gasket
B
Loosened cylinder head bolt or defective cylinder head
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
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(w/o STI)-107
Engine Trouble in General
MECHANICAL
4. Surging
Engine control system <Ref. to EN(H4DOTC)(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 fuel or insufficient fuel
C
Timing belt
Defective timing
B
Compression
Incorrect valve clearance
B
Loosened spark plug or defective gasket
C
Loosened cylinder head bolt or defective cylinder head
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
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(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 cylinder head
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
Symptoms
Problem parts etc.
Possible cause
RANK
ME(w/o STI)-108
Engine Trouble in General
MECHANICAL
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
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 cylinder head
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
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