Subaru 2002 IMPREZA Service Manual page 200

ENGINE TROUBLE IN GENERAL
MECHANICAL
7. After burning in exhaust
system
TROUBLE
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PROBLEM PARTS, ETC.
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POSSIBLE CAUSE
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RANK
5. Enaine does not return to
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Enaine control svstem <Ref. to EN(D0HC TURBOb2. Basic Diaanostic Procedure.>
I
A
1
Engine control system <Ref. to EN(D0HC TURBO)-2, Basic Diagnostic Procedure.>
Intake system
A
C
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Loosened or cracked intake duct
I
idle.
Loosened oil filler cap
Defective timing
Incorrect valve clearance
*
, I
*
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Intake system
I
Loosened or cracked vacuum hose
I A
C
B
B
I I
Others
1
Stuck or damaaed throttle valve \ A 1
Worn or broken valve spring
Worn or stuck piston rings, cylinder and piston
Incorrect valve timing
I I I
I
I
-
C
C
A
I
Accelerator cable out of adjustment
I B
A 6. Dieseling (Run-on)
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Engine control system <Ref. to EN(D0HC TURBO)-2, Basic Diagnostic Procedure.>
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8. Knocking
I 1 I
~~
Others
Engine control system <Ref. to EN(D0HC TURBO)-2, Basic Diagnostic Procedure.>
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Malfunction of evaporative emission control system C
A
Intake system
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Loosened oil filler cap B
I I
Cooling system
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Overheating I B I
Overheating
Loosened or cracked PCV hose
Defective PCV valve
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Others
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Malfunction of evaoorative emission control svstem
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B 1
A
A
B
Loosened oil pump attaching bolts and defective
gasket
Defective oil filter o-rina
I I I
Loosened or cracked PCV hose I C 1
B
B
I I I
I
I
I I I
Loosened or cracked vacuum hose
I I I
I
I
Defective PCV valve
I I I
Loosened spark pluns or defective nasket I C 1
I I I
. -
-
I
I
I I I
Loosened cylinder head bolts or defective gasket
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C
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I I I I
I I I
Improper valve seating I B I
I I I 4
I I I
Defective valve stem I C 1
I I
Lubrication system
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Incorrect oil pressure I C 1
I I I
I I
Cooling system
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Over cooling I C 1
I I
Belt
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Defective timina I B I
I I
I I
I
-
9. Excessive engine oil con-
sumption
Compression
Cooling system
Intake system
Compression
Lubrication system
Incorrect valve clearance I C
Incorrect valve timing I B
I C
Loosened oil filler cap
Defective valve stem I A
Worn or stuck piston rings, cylinder and piston
I A
Defective crankshaft oil seal
I B
Defective rocker cover gasket
I B
Loosened oil drain plug or defective gasket
I B
Loosened oil pan fitting bolts or defective oil pan
I B
ME(D0HC TURBO)-94