Subaru Impreza 2003 Service Manual page 1087

25.Engine Trouble in General
A: INSPECTION
NOTE:
"RANK" shown in the chart refers to the possibility
of reason for the trouble in order ("Very often" to
"Rarely")
TROUBLE
1. Engine will not start.
1) Starter does not turn.
2) Initial combustion does
not occur.
3) Initial combustion occurs.
ENGINE TROUBLE IN GENERAL
PROBLEM PARTS, ETC.
Starter
Battery
Friction
Starter
Engine control system <Ref. to EN(H4DOTC)-2, Basic Diagnostic Procedure.>
Fuel line
Belt
Compression
Engine control system <Ref. to EN(H4DOTC)-2, Basic Diagnostic Procedure.>
Intake system
Fuel line
Belt
Compression
ME(H4DOTC)-113
A — Very often
B — Sometimes
C — Rarely
POSSIBLE CAUSE
Defective battery-to-starter harness
Defective starter switch
Defective inhibitor switch or neutral switch
Defective starter
Poor terminal connection
Run-down battery
Defective charging system
Seizure of crankshaft and connecting rod bearing
Seized camshaft
Seized or stuck piston and cylinder
Defective starter
Defective fuel pump and relay
Lack of or insufficient fuel
Defective
Defective timing
Incorrect valve clearance
Loosened spark plugs or defective gasket
Loosened cylinder head bolts or defective gasket
Improper valve seating
Defective valve stem
Worn or broken valve spring
Worn or stuck piston rings, cylinder and piston
Incorrect valve timing
Improper engine oil (low viscosity)
Defective intake manifold gasket
Defective throttle body gasket
Defective fuel pump and relay
Clogged fuel line
Lack of or insufficient fuel
Defective
Defective timing
Incorrect valve clearance
Loosened spark plugs or defective gasket
Loosened cylinder head bolts or defective gasket
Improper valve seating
Defective valve stem
Worn or broken valve spring
Worn or stuck piston rings, cylinder and piston
Incorrect valve timing
Improper engine oil (low viscosity)
MECHANICAL
RANK
B
C
C
B
A
A
B
C
C
C
C
A
A
B
B
B
C
C
C
C
C
B
C
B
B
A
B
B
C
C
B
B
B
C
C
C
C
C
B
C
B
B