Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 109
SP(STI)-6
Accelerator Pedal
SPEED CONTROL SYSTEMS
IGNITION
IG(STI)
Page
General Description . . . . . . . . . . . . . . . . . . . . ...2
Spark Plug . . . . . . . . . . . . . . . . . . . . . . . . ..4
Ignition Coil . . . . . . . . . . . . . . . . . . . . . . . . 7
IG(STI)-2
General Description
IGNITION
1. General Description
A: SPECIFICATION
B: COMPONENT
Item
Specifications
Ignition coil
Type
FK0368
Ignition system
Independent ignition coil
Manufacturer
Diamond Electric
Spark plug
Manufacturer and type
NGK: SILFR6A
Thread size (diameter, pitch, length)
mm
14, 1.25, 26.5
Spark plug gap
mm (in) Standard
0.7 — 0.8 (0.028 — 0.031)
Electrode
Iridium
(1)
Spark plug
(3)
Engine harness stay (#3 ignition
coil side only)
Tightening torque: N·m (kgf-m, ft-lb)
(2)
Ignition coil
T1: 16 (1.6, 11.8)
T2: 21 (2.1, 15.5)
IG-02126
(1)
T2
T1
T2
(1)
(2)
(2)
T1
(3)
IG(STI)-3
General Description
IGNITION
C: CAUTION
• Prior to starting work, pay special attention to the following:
1. Always wear work clothes, a work cap, and protective shoes. Additionally, wear a helmet, protective
goggles, etc. if necessary.
2. Protect the vehicle using a seat cover, fender cover, etc.
3. Prepare the service tools, clean cloth, containers to catch grease and oil, etc.
• Vehicle components are extremely hot immediately after driving. Be wary of receiving burns from heated
parts.
• When performing a repair, identify the cause of trouble and avoid unnecessary removal, disassembly and
replacement.
• Before disconnecting connectors of sensors or units, be sure to disconnect the ground cable from battery.
• Always use the jack-up point when the shop jacks or rigid racks are used to support the vehicle.
• Remove contamination including dirt and corrosion before removal, installation, disassembly or assembly.
• Keep the removed parts in order and protect them from dust and dirt.
• All removed parts, if to be reused, should be reinstalled in the original positions with attention to the correct
directions, etc.
• Bolts, nuts and washers should be replaced with new parts as required.
• Be sure to tighten the fasteners including bolts and nuts to the specified torque.
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