Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 86
ME(STI)-106
Crankshaft
MECHANICAL
24.Crankshaft
A: SPECIFICATION
Refer to “Cylinder Block” for removal and installa-
tion procedures of the crankshaft. <Ref. to
ME(STI)-107
Engine Trouble in General
MECHANICAL
25.Engine Trouble in General
A: INSPECTION
NOTE:
The “RANK” shown in the chart shows the possibilities of the cause of trouble in order from “Very often” to
“Rarely”.
A — Very often
B — Sometimes
C — Rarely
Symptoms
Problem parts etc.
Possible cause
RANK
1. Engine does not start.
1) Starter does not turn.
Starter
Defective battery-to-starter harness
B
Defective starter switch
C
Defective starter
B
Battery
Improper connection of terminal
A
Run-down battery
A
Defective charging system
B
Friction
Seizure of crankshaft and connecting rod bearing
C
Seized camshaft
C
Seized or stuck piston and cylinder
C
Immobilizer system <Ref. to IM(diag)-2, Basic Diagnostic Procedure.>
A
2) Initial combustion does
not occur.
Starter
Defective starter
C
Engine control system <Ref. to EN(H4DOTC)(diag)-2, Basic Diagnostic Procedure.>
A
Fuel line
Defective fuel pump and relay
A
Clogged fuel line
C
Lack of fuel or insufficient fuel
B
Timing belt
Degradation, etc.
B
Defective timing
B
Compression
Incorrect valve clearance
C
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
B
Worn or stuck piston rings, cylinder and piston
C
Incorrect valve timing
B
Improper engine oil (low viscosity)
B
ME(STI)-108
Engine Trouble in General
MECHANICAL
3) Initial combustion occurs.
Engine control system <Ref. to EN(H4DOTC)(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 fuel or insufficient fuel
B
Timing belt
Degradation, etc.
B
Defective timing
B
Compression
Incorrect valve clearance
C
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
B
Worn or stuck piston rings, cylinder and piston
C
Incorrect valve timing
B
Improper engine oil (low viscosity)
B
4) Engine stalls after initial
combustion.
Engine control system <Ref. to EN(H4DOTC)(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 fuel or insufficient fuel
B
Timing belt
Degradation, etc.
B
Defective timing
B
Compression
Incorrect valve clearance
C
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
B
Worn or stuck piston rings, cylinder and piston
C
Incorrect valve timing
B
Improper engine oil (low viscosity)
B
Symptoms
Problem parts etc.
Possible cause
RANK
ME(STI)-109
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
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