Subaru IMPREZA 2002 Service Manual page 192

ENGINE TROUBLE IN GENERAL
Incorrect valve clearance
Loosened spark plugs or defective gasket
Loosened cvlinder head bolts or defective gasket
TROUBLE
10.
Excessive fuel consump-
B
C
C
PROBLEM PARTS. ETC.
I
POSSIBLE CAUSE
I
RANK
1
Worn or broken valve spring
Worn
or
stuck piston rings, cylinder and piston
Incorrect valve timing
Incorrect oil Dressure
1
Enaine control svstem <Ref. to EN(SOHC)-2, Basic Diaqnostic Procedure.>
I A I
C
B
B
C
1
Intake svstem
I
Dirty air cleaner element I A I
1
Belt
1
Defective timing 1 B 1
1
Compression
Lubrication system
Others
1
Cooling system
I
ImDroDer valve seating
1 B 1
I
Defective valve stem
I C 1
Over coolina I C 1
Accelerator cable out of adjustment
I B I
M E(S0HC)-94