2005 SUBARU IMPREZA WRX spark plugs

11 - 1
11
Maintenance and service
Maintenance schedule ................................. 11-3
Maintenance precautions ............................ 11-3 Before checking or servicing in the engine compartment .................................................. 11-4
When you do checking or servicing in the engine compartment while the engine is
running ............................................................ 11-5
Engine hood .................................................. 11-5
Engine compartment overview ................... 11-8 2.5-liter non-turbo models ................................ 11-8
2.0-liter turbo models ....................................... 11-9
2.5-liter turbo models ....................................... 11-10
Engine oil ...................................................... 11-11 Checking the oil level ....................................... 11-11
Changing the oil and oil filter .......................... 11-12
Recommended grade and viscosity ................ 11-16
Recommended grade and viscosity under severe driving conditions .............................. 11-18
Synthetic oil ....................................................... 11-18
Cooling system ............................................. 11-18 Cooling fan, hose and connections ................ 11-19
Engine coolant .................................................. 11-19
Air cleaner element ...................................... 11-24 Replacing the air cleaner element ................... 11-24
Spark plugs ................................................... 11-28 Recommended spark plugs ............................. 11-28
Drive belts ..................................................... 11-29
Manual transmission oil ............................... 11-30 Checking the oil level ....................................... 11-30
Recommended grade and viscosity ................ 11-31 Automatic transmission fluid ...................... 11-32
Checking the fluid level .................................... 11-32
Recommended fluid ......................................... 11-34
Front differential gear oil (AT vehicles) ...... 11-35 Checking the oil level ....................................... 11-35
Recommended grade and viscosity ............... 11-35
Rear differential gear oil ............................... 11-36 Checking the gear oil level .............................. 11-36
Recommended grade and viscosity ............... 11-37
Power steering fluid ...................................... 11-38 Checking the fluid level .................................... 11-38
Recommended fluid ......................................... 11-39
Brake fluid ..................................................... 11-40 Checking the fluid level .................................... 11-40
Recommended brake fluid ............................... 11-40
Clutch fluid (MT vehicles) ............................ 11-41 Checking the fluid level .................................... 11-41
Recommended clutch fluid .............................. 11-42
Brake booster ................................................ 11-42
Brake pedal .................................................... 11-43 Checking the brake pedal free play ................ 11-43
Checking the brake pedal reserve distance ... 11-43
Clutch pedal (MT vehicles) ........................... 11-44 Checking the clutch function .......................... 11-44
Checking the clutch pedal free play ............... 11-44
Replacement of brake pad and lining ......... 11-45 Breaking-in of new brake pads and linings .... 11-45
Parking brake stroke .................................... 11-46
Tires and wheels ........................................... 11-47

11 - 2 8
Maintenance and service
Spark plugs
It may be difficult to replace the spark plugs. It is rec-
ommended 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 Mainte-
nance Booklet”.
y
When disconnecting the spark plug cables,
always grasp the spark plug cap, not the ca- bles. y
Make sure the cables are replaced in the cor-
rect order.
„ Recommended spark plugs
2.5-liter non-turbo models:
FR5AP-11
2.0-liter turbo models:
PFR6G (NGK)
2.5-liter turbo models:
IFLR6B (NGK)HSB032BA

12-3
Specifications
– CONTINUED –
„Engine
„ Electrical system
AT: Automatic transmission
MT: Manual transmission
Engine modelEJ253
(2.5-liter, SOHC, non-turbo)EJ205 (2.0-liter, DOHC, turbo)EJ257 (2.5-liter, DOHC, turbo)
Engine typeHorizontally opposed, liquid cooled 4 cylinder, 4-stroke gasoline engine
Displacement cc (cu-in)2,457 (150)1,994 (122)2,457 (150)
Bore × Stroke in (mm)3.9 × 3.1 (99.5 × 79.0)3.6 × 2.9 (92.0 × 75.0)3.9 × 3.1 (99.5 × 79.0)
Compression ratio10.0 : 18.0 : 18.2 : 1
Firing order1 – 3 – 2 – 4
Battery type and
capacity (5HR)MT12V-48AH (55D23L)
ATWith 2.5-liter non-turbo engine12V-52AH (75D23L)
With 2.0-liter turbo engine12V-52AH (65D23L)
Alternator2.5-liter non-turbo and
2.0-liter turbo engine12V-75A
2.5-liter turbo engine12V-90A
Spark plugs2.5-liter non-turbo engineFR5AP-11
2.0-liter turbo enginePFR6G (NGK)
2.5-liter turbo engineIFLR6B (NGK)

14-7
Index
P
Parking
Brake ............................................................ 7-36
Brake stroke ............................................... 11-46
Light switch ................................................... 3-35
Tips ............................................................... 7-36
Periodic inspections ............................................ 8-6 Power Door locking switches ..................................... 2-8
Steering ........................................................ 7-29
Steering fluid ............................................... 11-38
Windows ....................................................... 2-24
Preparing to drive ................................................ 7-9
Printed antenna ................................................... 5-2 R
Rear Combination lights ...................................... 11-78
Differential gear oil ...................................... 11-36
Differential oil temperature warning light ...... 3-23
Gate .............................................................. 2-31
Seats .............................................................. 1-8
Rear seat Folding down (Wagon) ................................. 1-12
Rear window
Defogger button ............................................ 3-41
Wiper and washer switch .............................. 3-40 Recommended
Automatic transmission fluid ....................... 11-34
Brake fluid ................................................... 11-40
Clutch fluid .................................................. 11-42
Oil grade and viscosity ................... 11-16, 11-18, 11-31, 11-35, 11-37
Power steering fluid .................................... 11-39
Spark plugs ................................................. 11-28
Remote keyless entry system ............................. 2-9
Replacement Brake pad and lining ................................... 11-45
Wiper blades ............................................... 11-57
Replacing
Air cleaner element ..................................... 11-24
Battery (Remote keyless entry system) ........ 2-11
Lost transmitters (keyless entry system) ...... 2-13
Replacing bulbs ............................................... 11-69
Cargo area light .......................................... 11-81
Dome light .................................................. 11-81
Front fog light .............................................. 11-78
Front turn signal light .................................. 11-73
Headlights ................................................... 11-70
High mount stop light .................................. 11-83
License plate light ....................................... 11-81
Map light ..................................................... 11-81
Parking light ................................................ 11-74
Rear combination lights .............................. 11-78

14-8
Index
Trunk light ................................................... 11-82
REV indicator light and buzzer .......................... 3-13
Rocking the vehicle ........................................... 8-16
Roof rail and crossbar ....................................... 8-20 S Seat Fabric ........................................................... 10-6
Heater ............................................................. 1-7
Seatbelt .................................................................. 6
Maintenance ................................................. 1-27
Pretensioners ............................................... 1-28
Safety tips ..................................................... 1-13
Warning light and chime ...................... 1-15, 3-20
Seatbelts ........................................................... 1-13
Security system ................................................. 2-17
Selector lever .................................................... 7-23 Position indicator .......................................... 3-27
Shift lock release ............................................... 7-27
Side ventilators .................................................... 4-3
Snow tires ......................................................... 8-14
Sounding a panic alarm ..................................... 2-11
Spark plugs ..................................................... 11-28
Specifications .................................................... 12-2
Speedometer .............................................. 3-8, 3-15
SRS airbag (Supplemental Restraint System airbag) ....................................................... 6, 1-53 SRS airbag system monitors ............................. 1-73
SRS airbag system servicing ............................ 1-74
SRS airbag system warning light ...................... 3-20
SRS frontal airbag ............................................. 1-57
SRS side airbag ................................................ 1-65
Starting the engine .............................................. 7-9
State emission testing (U.S. only) ....................... 7-7
Stopping the engine .......................................... 7-11
Storage compartments ........................................ 6-5
Sun shades ....................................................... 2-35
Sun visors ........................................................... 6-4
Supplemental Restraint System airbag
(SRS) ............................................................. 1-53
Synthetic leather upholstery .............................. 10-6 T
Tachometer ................................................ 3-9, 3-16
Temperature gauge .................................. 3-11, 3-18
Temporary spare tire ........................................... 9-3
Tilt steering wheel ............................................. 3-50 Tire
Chains .......................................................... 8-16
Inspection ................................................... 11-47
Pressures and wear ................................... 11-48
Replacement .............................................. 11-53
Rotation ...................................................... 11-52
Tires .................................................................. 12-5