Subaru IMPREZA GD 2007 Series Manual page 2497

asieps_tobira_IM_US.book 96 ページ ２０１２年１月１７日 火曜日 午後３時４８分
MECHANICAL
Symptoms
2. Rough idle and engine
stall
Engine Trouble in General
Problem parts etc.
Engine control system <Ref. to EN(H4DOTC)(diag)-2, Basic Diagnostic Procedure.>
<Ref. to EN(STI)(diag)-2, Basic Diagnostic Procedure.>
Intake system Loosened or cracked intake duct
Loosened or cracked PCV hose
Loosened or cracked vacuum hose
Defective intake manifold gasket
Defective throttle body gasket
Defective PCV valve
Loosened oil filler cap
Dirty air cleaner element
Fuel line Defective fuel pump and relay
Clogged fuel line
Lack of or insufficient fuel
Timing belt Defective timing
Compression Incorrect valve clearance
Loosened spark plug or defective gasket
Loosened cylinder head bolt or defective head gasket
Improper valve sealing
Defective valve stem
Worn or broken valve spring
Worn or stuck piston rings, cylinder and piston
Incorrect valve timing
Improper engine oil (low viscosity)
Lubrication system Incorrect oil pressure
Defective rocker cover gasket
Cooling system Overheating
Others Evaporative emission control system malfunction
Stuck or damaged throttle valve
ME(H4DOTC)-96
Possible cause RANK
A
A
A
A
B
B
C
B
C
C
C
B
C
B
B
B
B
C
B
B
A
B
B
C
C
A
B