Subaru Legacy 2002 Service Manual page 1101

Mechanical
TROUBLE
5. Engine does not return to
idle.
6. Dieseling (Run-on)
7. After burning in exhaust
system
8. Knocking
9. Excessive engine oil con-
sumption
ENGINE TROUBLE IN GENERAL
PROBLEM PARTS, ETC.
¼ Engine control system <Ref. to EN(H6)-2, Basic Diagnostic Procedure.>
¼ Intake system
¼ Others
¼ Engine control system <Ref. to EN(H6)-2, Basic Diagnostic Procedure.>
¼ Cooling system
¼ Others
¼ Engine control system <Ref. to EN(H6)-2, Basic Diagnostic Procedure.>
¼ Intake system
¼ Chain
¼ Compression
¼ Lubrication system
¼ Cooling system
¼ Others
¼ Engine control system <Ref. to EN(H6)-2, Basic Diagnostic Procedure.>
¼ Intake system
¼ Chain
¼ Compression
¼ Cooling system
¼ Intake system
¼ Compression
¼ Lubrication system
ME(H6)-80
POSSIBLE CAUSE
¼ Loosened or cracked vacuum hose
¼ Stuck or damaged throttle valve
¼ Accelerator cable out of adjustment
¼ Overheating
¼ Malfunction of evaporative emission control system
¼ Loosened or cracked intake duct
¼ Loosened or cracked PCV hose
¼ Loosened or cracked vacuum hose
¼ Defective PCV valve
¼ Loosened oil filler cap
¼ Defective timing
¼ Incorrect valve clearance
¼ Loosened spark plugs or defective gasket
¼ Loosened cylinder head bolts or defective gasket
¼ Improper valve seating
¼ Defective valve stem
¼ Worn or broken valve spring
¼ Worn or stuck piston rings, cylinder and piston
¼ Incorrect valve timing
¼ Incorrect oil pressure
¼ Over cooling
¼ Malfunction of evaporative emission control system
¼ Loosened oil filter cap
¼ Defective timing
¼ Incorrect valve clearance
¼ Incorrect valve timing
¼ Overheating
¼ Loosened or cracked PCV hose
¼ Defective PCV valve
¼ Loosened oil filler cap
¼ Defective valve stem
¼ Worn or stuck piston rings, cylinder and piston
¼ Loosened oil pump attaching bolts and defective
gasket
¼ Defective oil filter seal
¼ Defective crankshaft oil seal
¼ Defective rocker cover gasket
¼ Loosened oil drain plug or defective gasket
¼ Loosened oil pan fitting bolts or defective oil pan
RANK
A
A
A
B
A
B
B
A
C
C
B
B
C
B
B
C
C
B
C
C
C
A
C
C
C
A
B
B
C
B
A
A
B
C
A
A
B
B
B
B
B
B