Subaru IMPREZA 2002 Service Manual page 188

ENGINE TROUBLE IN GENERAL
MECHANICAL
Fuel line
Belt
TROUBLE
3)
Initial combustion occur.
Defective throttle body gasket B
Defective fuel pump and relay C
Clogged fuel line C
Lack of or insufficient fuel B
Defective B
4) Engine stalls after initial
:ombustion.
Loosened spark plugs or defective gasket
Loosened cylinder head bolts or defective gasket
ImDroDer valve seatina
PROBLEM PARTS. ETC.
I
POSSIBLE CAUSE
I
RANK
C
C
C
Enaine control svstem <Ref. to EN(SOHC)-2, Basic Diaqnostic Procedure.>
I A
Incorrect valve timing
Improper engine oil (low viscosity)
Engine control system <Ref. to EN(SOHC)Q, Basic Diagnostic Procedure.>
Intake system Loosened or cracked intake duct
Loosened or cracked PCV hose
Intake system
B
B
A
B
C
I
Defective intake manifold gasket
I B
Fuel line
Defective intake manifold gasket B
Defective throttle body gasket B
Dirty air cleaner element C
Cloaaed fuel line C
I
Defective timing I B
Incorrect valve clearance
Loosened spark plugs or defective gasket
Loosened cvlinder head bolts or defective aasket
Compression
C
C
C
I
Incorrect valve clearance
I C
Improper valve seating
Worn or broken valve spring
Worn or stuck piston rings, cylinder and piston
Incorrect valve timing
Improper engine oil (low viscosity)
Defective valve stem
C
C
B
C
B
B
I
Defective valve stem
I C
I
Worn or broken valve spring
I B
I
Worn or stuck piston rings, cylinder and piston
I C
I
Loosened or cracked vacuum hose
I C
I
Lack of or insufficient fuel
I B
Belt
I
Defective I B
I
Defective timing I B
Compression
ME( S0HC)-90