Subaru IMPREZA GD 2007 Series Manual page 865

asieps_tobira_IM_US.book 98 ページ ２０１２年１月１７日 火曜日 午後３時４８分
MECHANICAL
Symptoms
5. Engine does not return to
idle.
6. Dieseling (Run-on)
7. After burning in exhaust
system
8. Knocking
9. Excessive engine oil
consumption
Engine Trouble in General
Problem parts etc.
Engine control system <Ref. to EN(H4SO)(diag)-2, Basic Diagnostic Procedure.>
Intake system Loosened or cracked vacuum hose
Others Stuck or damaged throttle valve
Engine control system <Ref. to EN(H4SO)(diag)-2, Basic Diagnostic Procedure.>
Cooling system Overheating
Others Evaporative emission control system malfunction
Engine control system <Ref. to EN(H4SO)(diag)-2, Basic Diagnostic Procedure.>
Intake system Loosened or cracked intake duct
Loosened or cracked PCV hose
Loosened or cracked vacuum hose
Defective PCV valve
Loosened oil filler cap
Timing belt Defective timing
Compression Incorrect valve clearance
Loosened spark plug or defective gasket
Loosened cylinder head bolt or defective gasket
Improper valve sealing
Defective valve stem
Worn or broken valve spring
Worn or stuck piston rings, cylinder and piston
Incorrect valve timing
Lubrication system Incorrect oil pressure
Cooling system Over-cooling
Others Evaporative emission control system malfunction
Engine control system <Ref. to EN(H4SO)(diag)-2, Basic Diagnostic Procedure.>
Intake system Loosened oil filler cap
Belt Defective timing
Compression Incorrect valve clearance
Incorrect valve timing
Cooling system Overheating
Intake system Loosened or cracked PCV hose
Defective PCV valve
Loosened oil filler cap
Compression Defective valve stem
Worn or stuck piston rings, cylinder and piston
Lubrication system Loosened oil pump attaching bolts and defective gas-
ket
Defective oil filter seal
Defective crankshaft oil seal
Defective rocker cover gasket
Loosened oil drain plug or defective gasket
Loosened oil pan fitting bolts or defective oil pan
ME(H4SO)-98
Possible cause RANK
A
A
A
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