Subaru Legacy IV (2008 year). Service manual — part 93
IG(H4SO)-3
General Description
IGNITION
C: CAUTION
• Wear appropriate work clothing, including a cap,
protective goggles and protective shoes when per-
forming any work.
• Remove contamination including dirt and corro-
sion before removal, installation or disassembly.
• Keep the disassembled parts in order and pro-
tect them from dust and dirt.
• Before removal, installation or disassembly, be
sure to clarify the failure. Avoid unnecessary re-
moval, installation, disassembly and replacement.
• Vehicle components are extremely hot after driv-
ing. Be wary of receiving burns from heated parts.
• Be sure to tighten fasteners including bolts and
nuts to the specified torque.
• Place shop jacks or rigid racks at the specified
points.
• Before disconnecting connectors of sensors or
units, be sure to disconnect the ground cable from
the battery.
IG(H4SO)-4
Spark Plug
IGNITION
2. Spark Plug
A: REMOVAL
Spark plug:
Refer to “SPECIFICATION” for the spark
plug. <Ref. to IG(H4SO)-2, SPECIFICATION,
General Description.>
1. RH SIDE
1) Disconnect the ground cable from battery.
2) Remove the air cleaner case. <Ref. to
IN(H4SO)-5, REMOVAL, Air Cleaner Case.>
3) Remove the spark plug cords by pulling the boot.
(Do not pull the cord itself.)
4) Remove the spark plug with a spark plug socket.
2. LH SIDE
1) Remove the battery. <Ref. to SC(H4SO)-20,
REMOVAL, Battery.>
2) Remove the spark plug cords by pulling the boot.
(Do not pull the cord itself.)
3) Remove the spark plug with a spark plug socket.
B: INSTALLATION
1. RH SIDE
Install in the reverse order of removal.
Tightening torque:
21 N·m (2.1 kgf-m, 15.5 ft-lb)
2. LH SIDE
Install in the reverse order of removal.
Tightening torque:
21 N·m (2.1 kgf-m, 15.5 ft-lb)
IN-00203
IG-00017
IG-00018
IG-02049
IG-00022
IG(H4SO)-5
Spark Plug
IGNITION
C: INSPECTION
Check the electrodes and inner and outer ceramic
insulator of plugs, noting the type of deposits and
the degree of electrode erosion.
1) Normal:
Brown to grayish-tan deposits and slight electrode
wear indicate correct spark plug heat range.
2) Carbon fouled:
Dry fluffy carbon deposits on insulator and elec-
trode are mostly caused by slow speed driving in
the city, weak ignition, too rich fuel mixture and dirty
air cleaner.
3) Oil fouled:
Wet black deposits show oil entrance into the com-
bustion chamber through worn rings or pistons, or
excessive clearance between valve guides and
stems.
4) Overheating:
White or light gray insulator with black or brown
spots and bluish burnt electrodes indicate engine
overheating, incorrect ignition timing, wrong selec-
tion of fuel, and loose spark plugs.
D: ADJUSTMENT
Clean spark plugs with a nylon brush, etc. Clean
and remove the carbon or oxide deposits. If depos-
its are too stubborn, replace the spark plugs. After
cleaning the spark plugs, measure the spark plug
gap using a gap gauge.
NOTE:
• Never use plug cleaner.
• Do not use metal brush or it will wear insulator.
Spark plug gap L:
1.0 — 1.1 mm (0.039 — 0.043 in)
(A) Spark plug gap
(B) Carbon accumulation or wear
(C) Cracks
(D) Damage
(E) Damaged gasket
IG-00010
(A)
(B)
(C)
(D)
(E)
IG-00011
IG-00012
IG-00013
IG-00014
IG-02035
L
IG(H4SO)-6
Ignition Coil and Ignitor Assembly
IGNITION
3. Ignition Coil and Ignitor
Assembly
A: REMOVAL
1) Disconnect the ground cable from battery.
2) Disconnect the spark plug cords from ignition
coil and ignitor assembly.
3) Disconnect the connector (A) from the ignition
coil and ignitor assembly.
4) Remove the bolt (B) which secures the ignition
coil and ignitor assembly to the intake manifold.
B: INSTALLATION
Install in the reverse order of removal.
Tightening torque:
8 N·m (0.8 kgf-m, 5.9 ft-lb)
CAUTION:
Connect the spark plug cords to correct posi-
tions. Failure to do so will damage the unit.
C: INSPECTION
Check the secondary coil resistance using a tester.
Replace if defective.
CAUTION:
• If the resistance is extremely low, it indicates
the presence of a short-circuit.
• Ignitor is integrated with the coil. Therefore
the resistance of primary side coil cannot be
measured.
Specified resistance:
[Secondary side]
Between (A) and (B)
11.2 k
:r
15%
Between (C) and (D)
11.2 k
:r
15%
IN-00203
IG-02064
IG-02065
(A)
(B)
(B)
IG-02066
(D)
(B)
(C)
(A)
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