Subaru 2002 IMPREZA Service Manual page 201

ENGINE TROUBLE IN GENERAL
MECHANICAL
TROUBLE
10. Excessive fuel consump-
PROBLEM PARTS, ETC.
1
POSSIBLE CAUSE RANK
Engine control system <Ref. to EN(D0HC TURBO)-2, Basic Diagnostic Procedure.> A
I
tion
I
Intake svstem
I
Dirtv air cleaner element I A I
Belt Defective timing B
Compression Incorrect valve clearance B
-
Loosened spark plugs or defective gasket C
Loosened cylinder head bolts or defective gasket
C
Improper valve seating B
Defective valve stem C
Worn or broken valve spring
C
Worn or stuck piston rings, cylinder and piston B
Incorrect valve timing
6
Lubrication system Incorrect oil pressure C
Cooling system Over cooling C
Others Accelerator cable out of adjustment B
ME(D0HC TURBO)-95