2012 SUBARU IMPREZA WRX STI spark plugs

Black plate (21,1)
北米Model "A1130BE-A" EDITED: 2011/ 6/ 2
Maintenance schedule ....................................... 11-3
Maintenance precautions ................................... 11-3
Before checking or servicing in the engine
compartment .................................................... 11-4
When checking or servicing in the engine compartment .................................................... 11-4
When checking or servicing in the engine compartment while the engine is running .......... 11-5
Engine hood....................................................... 11-5
Engine compartment overview .......................... 11-6
Turbo models except STI.................................... 11-6
STI..................................................................... 11-7
Engine oil ............................................................ 11-8
Checking the oil level ......................................... 11-8
Changing the oil and oil filter .............................. 11-9
Recommended grade and viscosity .................. 11-10
Synthetic oil ..................................................... 11-10
Cooling system ................................................ 11-11
Cooling fan, hose and connections ................... 11-11
Engine coolant ................................................. 11-12
Air cleaner element .......................................... 11-13
Replacing the air cleaner element ..................... 11-13
Spark plugs...................................................... 11-14
Recommended spark plugs .............................. 11-14
Drive belts........................................................ 11-15
Manual transmission oil .................................. 11-15
Checking the oil level....................................... 11-15
Recommended grade and viscosity .................. 11-16
Rear differential gear oil.................................. 11-16
Recommended grade and viscosity .................. 11-16
Power steering fluid........................................ 11-17
Checking the fluid level .................................... 11-17
Recommended fluid ......................................... 11-17
Brake fluid........................................................ 11-18
Checking the fluid level .................................... 11-18
Recommended brake fluid ............................... 11-18
Clutch fluid....................................................... 11-19
Checking the fluid level .................................... 11-19
Recommended clutch fluid ............................... 11-19
Brake booster.................................................. 11-20
Brake pedal ...................................................... 11-20
Checking the brake pedal free play .................. 11-20
Checking the brake pedal reserve distance....... 11-21
Clutch pedal ..................................................... 11-21
Checking the clutch function ............................ 11-21
Checking the clutch pedal free play .................. 11-21
Hill start assist system.................................... 11-22
Replacement of brake pad and lining ............ 11-22
Breaking-in of new brake pads and linings ....... 11-22
Parking brake stroke....................................... 11-23
Tires and wheels .............................................. 11-23
Types of tires................................................... 11-23
Tire pressure monitoring system (TPMS) (if equipped) ...................................................... 11-24
Tire inspection ................................................. 11-25
Tire pressures and wear .................................. 11-25
Wheel balance ................................................. 11-27
Wear indicators ............................................... 11-28
Tire rotation direction mark .............................. 11-28
Tire rotation ..................................................... 11-29
Maintenance and service
11

Black plate (344,1)
北米Model "A1130BE-A" EDITED: 2011/ 6/ 7
11-14
Maintenance and service
4. Open the air cleaner case and remove
the air cleaner element.
5. Clean the inside of the air cleaner case
and case cover with a damp cloth and
install a new air cleaner element.6. If the air cleaner case has been
removed, insert the three projections on
the air cleaner case into the slits on the air
cleaner case cover.
7. Install in the reverse order of removal.
Spark plugsIt may be difficult to replace the spark
plugs. It is recommended that you have
the spark plugs replaced by your
SUBARU dealer.
The spark plugs should be replaced
according to the maintenance schedule
in the “Warranty and Maintenance Book-
let ”.
CAUTION
. When disconnecting the spark
plug cables, always grasp the
spark plug cap, not the cables.
. Make sure the cables are re-
placed in the correct order.
& Recommended spark plugsFor the recommended spark plugs, refer
to“Electrical system ”F 12-3.

Black plate (381,1)
北米Model "A1130BE-A" EDITED: 2011/ 6/ 7
& EngineEngine model
EJ255
(2.5 L, DOHC, turbo, except STI) EJ257
(2.5 L, DOHC, turbo, STI)
Engine type Horizontally opposed, liquid cooled 4 cylinder, 4-stroke gasoline engine
Displacement cc (cu-in) 2,457 (150)
Bore 6Stroke in (mm) 3.9 63.1 (99.5 679.0)
Compression ratio 8.4 : 1 8.2 : 1
Firing order 1
– 3–2– 4& Electrical systemBattery type and capacity (5HR)
MT 12V-48AH (55D23L)
Alternator Turbo models
12V-110A
Spark plugs Turbo models
SILFR6A (NGK)Specifications
12-3
–
CONTINUED –
12

Black plate (8,1)
北米Model "A1130BE-A" EDITED: 2011/ 6/ 3
14-8
Index
Gate ............................................................. 2-26, 9-16
Turn signal light .................................................... 11-43
Viscous limited slip differential ................................. 7-24
Rear differential Oil temperature warning light ................................... 3-16
Rear seat .................................................................... 1-7
Armrest ................................................................... 1-8
Folding down ........................................................... 1-9
Head restraint adjustment ......................................... 1-8
Rear window Defogger ............................................................... 3-45
Wiper and washer switch ........................................ 3-36
Wiper blades ........................................................ 11-34
Recommended Automatic transmission fluid .................................... 12-7
Brake fluid. ............................................................ 12-7
Clutch fluid ............................................................ 12-7
Engine oil .............................................................. 12-5
Front differential gear oil ......................................... 12-6
Manual transmission oil .......................................... 12-6
Power steering fluid ................................................ 12-7
Rear differential gear oil .......................................... 12-6
Spark plugs ........................................................... 12-3
Refueling .................................................................... 7-4
Remote engine start system ........................................ 7-10
Remote keyless entry system ........................................ 2-7
Replacement Brake pad and lining ............................................. 11-22
Wiper blades ........................................................ 11-32
Replacing Air cleaner element ............................................... 11-13 Battery (remote engine start transmitter)
.................... 7-12
Battery (remote keyless entry system) ....................... 2-11
Lost transmitters (remote keyless entry system) ......... 2-11
Replacing bulbs ....................................................... 11-39
Back-up light (4-door) ............................................ 11-43
Back-up light (5-door) ............................................ 11-45
Brake/Tail and rear side marker light (4-door) ........... 11-43
Cargo area light ................................................... 11-47
Dome light ........................................................... 11-47
Front fog light ....................................................... 11-42
Front turn signal light ............................................ 11-42
Headlight ............................................................. 11-39
High mount stop light ............................................ 11-47
License plate light ................................................. 11-45
Map light ............................................................. 11-46
Rear combination light .......................................... 11-43
Trunk light ........................................................... 11-47
REV indicator light and buzzer ..................................... 3-10
Rocking the vehicle ..................................................... 8-9
Roof molding and crossbar .......................................... 8-12
S
Safety Precautions when driving ............................................. 5
Symbol ...................................................................... 2
Warnings ................................................................... 2
Seat Fabric ................................................................... 10-5
Front ...................................................................... 1-2
Heater .................................................................... 1-6
Rear ...................................................................... 1-7

Black plate (9,1)
北米Model "A1130BE-A" EDITED: 2011/ 6/ 3
Seatbelt ................................................................. 5, 1-11
Fastening .............................................................. 1-12
Maintenance .......................................................... 1-19
Pretensioners ........................................................ 1-19
Safety tips ............................................................. 1-11
Warning light and chime ......................................... 3-13
Security Alarm system ........................................................ 2-15
ID plate ................................................................... 2-3
Immobilizer. ............................................................. 2-2
Indicator light ......................................................... 3-23
Shock sensors ....................................................... 2-19
Shift-up indicator light ................................................. 3-23
Shock sensors ........................................................... 2-19
Shopping bag hook .................................................... 6-11
SI-DRIVE
Indicator light ......................................................... 3-23
SI-DRIVE mode ......................................................... 7-22
Snow tires ......................................................... 8-8, 11-24
Snowy and icy roads .................................................... 8-7
Sounding a panic alarm .............................................. 2-10
Spark plugs ...................................................... 11-14, 12-3
Specifications ............................................................ 12-2
Speedometer ............................................................... 3-7
SRS Frontal airbag ........................................................ 1-43
SRS airbag (Supplemental Restraint System airbag) ... 5, 1-34
SRS airbag system Monitors. ............................................................... 1-55
Servicing ............................................................... 1-56
Warning light ......................................................... 3-14 Starting the engine
...................................................... 7-9
State emission testing (U.S. only) .................................. 7-7
Steering wheel
Power ................................................................... 7-24
Tilt/telescopic ......................................................... 3-47
Stopping the engine .................................................... 7-10
Storage compartment ................................................... 6-4
Sun shade ................................................................. 2-29
Sun visors .................................................................. 6-4
Supplemental Restraint System airbag (SRS) ................ 1-34
Synthetic leather upholstery ......................................... 10-5
T
Tachometer ................................................................. 3-9
Temperature gauge ..................................................... 3-10
Temperature warning light Rear differential oil .................................................. 3-16
Temporary spare tire .................................................... 9-2
Tether (child restraint system) .............................. 1-29, 1-31
Tie-down hooks .......................................................... 9-13
Tire................................................................. 11-23, 12-9 Chains ................................................................... 8-9
Inspection ............................................................ 11-25
Pressures and wear .............................................. 11-25
Replacement. ....................................................... 11-29
Rotation .............................................................. 11-29
Size and pressure .................................................. 12-9
Types .................................................................. 11-23
Tire pressure monitoring system (TPMS) ....... 7-32, 9-8, 11-24
Warning light .......................................................... 3-16
Tires and wheels ...................................................... 11-23
Index
14-9