Subaru Impreza 2002 Service Manual page 231

MECHANICAL
21.Engine Trouble in General
A: INSPECTION
NOTE:
"RANK" shown in the chart refer 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 occur.
ENGINE TROUBLE IN GENERAL
Problem Parts, etc.
• Starter
• Battery
• Friction
• Starter
• Engine control system <Ref. to EN(TURBO)-2, Basic Diagnostic Procedure.>
• Fuel line
• Belt
• Compression
• Engine control system <Ref. to EN(TURBO)-2, Basic Diagnostic Procedure.>
• Intake system
• Fuel line
• Belt
• Compression
ME(STi)-92
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)
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