Subaru IMPREZA GD 2007 Series Manual page 2495

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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
1. Engine does not start.
1) Starter does not turn.
2) Initial combustion does
not occur.
Engine Trouble in General
Problem parts etc.
Starter Defective battery-to-starter harness
Defective starter switch
Defective inhibitor switch or neutral switch
Defective starter
Battery Improper connection of terminal
Run-down battery
Defective charging system
Friction Seizure of crankshaft and connecting rod bearing
Seized camshaft
Seized or stuck piston and cylinder
Starter Defective starter
Engine control system <Ref. to EN(H4DOTC)(diag)-2, Basic Diagnostic Procedure.>
<Ref. to EN(STI)(diag)-2, Basic Diagnostic Procedure.>
Fuel line Defective fuel pump and relay
Clogged fuel line
Lack of or insufficient fuel
Timing belt Degradation, etc.
Defective timing
Compression Incorrect valve clearance
Loosened spark plug or defective gasket
Loosened cylinder head bolt or defective head gasket
Improper valve sealing
Defective valve stem
Worn or broken valve spring
Worn or stuck piston rings, cylinder and piston
Incorrect valve timing
Improper engine oil (low viscosity)
ME(H4DOTC)-94
Possible cause RANK
B
C
C
B
A
A
B
C
C
C
C
A
A
C
B
B
B
C
C
C
C
C
B
C
B
B