Subaru 2002 IMPREZA Service Manual page 198

ENGINE TROUBLE IN GENERAL
MECHANICAL
Intake system Loosened or cracked intake duct
Loosened or cracked PCV hose
Loosened or cracked vacuum hose
TROUBLE
4)
Engine stalls after initial
combustion.
2. Rough idle and engine
stall
B
C
C
PROBLEM PARTS, ETC.
I
POSSIBLE CAUSE
I
RANK
Engine control system <Ref. to EN(D0HC TURBO)P, Basic Diagnostic Procedure.>
I
A
Fuel line
Belt
Dirty air cleaner element C
Clogged fuel line C
Lack of or insufficient fuel
B
Defective B
Defective timina B
I
I
Defective intake manifold aasket
I B
I
Improper engine oil (low viscosity)
Engine control system <Ref. to EN(D0HC TURBO)-2, Basic Diagnostic Procedure.>
I
Defective throttle body gasket
I B
B
A
Fuel line
Compression
Loosened oil filler cap
Dirty air cleaner element
Defective fuel Dump and relav
B
C
C
I
Incorrect valve clearance
I C
Incorrect valve clearance
Loosened spark plugs or defective gasket
Loosened cvlinder head bolts or defective aasket
I
Loosened spark plugs or defective gasket
I C
B
B
B
I
Loosened cylinder head bolts or defective gasket
I
C
Stuck or damaged throttle valve
Accelerator cable out of adjustment
Improper valve seating I C
Defective valve stem I C
B
C
I
I B
I
Worn or broken valve sprina
I
Worn or stuck piston rings, cylinder and piston
I C
I
Incorrect valve timing
I B
Intake system Loosened or cracked intake duct
Loosened or cracked PCV hose
/ A
/ A
I
Loosened or cracked vacuum hose
I A
I
Defective intake manifold gasket
I B
Defective throttle body gasket
I B
Defective PCV valve I C
I
Clogged fuel line
I C
I
Lack of or insufficient fuel
I B
Belt
I
Defective timing I C
Compression
I
Improper valve seatina
I B
I
Defective valve stem
I C
1
Worn or broken valve spring
I B
I
Worn or stuck piston rings, cylinder and piston
I B
Incorrect valve timing ] A
ImDroDer enaine oil (low viscositv)
I B
Lubrication system
I
Incorrect oil pressure
-1 --B
I
Defective rocker cover gasket
I C
Cooling system
I
Overheating I C
Others
I
Malfunction of evaporative emission control system
I
A
ME(D0HC TURBO)-92