Engine Mechanical:
Detailed diagnostics, repair, and overhaul for all engine variants
Engine Performance:
Tuning, diagnosis of performance issues, emissions control systems
Fuel System:
Fuel injection, fuel pump, fuel injectors, evaporative emission control (EVAP)
Ignition System:
Spark plugs, ignition coils, coil-on-plug systems, timing
Cooling System:
Radiator, thermostat, water pump, coolant flow, pressure testing
Exhaust System:
Catalytic converter, mufflers, exhaust pipes, oxygen sensors
Transmission Manual:
Clutch, gearbox overhaul, shift mechanisms, internal components
Transmission Automatic:
Torque converter, planetary gear sets, valve body, electronic controls
Drivetrain:
All-Wheel Drive (AWD) system, differentials, driveshafts, CV joints
Suspension System:
Front and rear suspension components, struts, springs, bushings, alignment
Steering System:
Power steering pump, rack and pinion, steering column, tie rods
Brake System:
Hydraulic system, brake calipers, rotors, pads, ABS, EBD
Wheel Tire System:
Wheel torque specifications, tire pressure recommendations
Electrical System Power:
Battery, alternator, starter motor, charging system
Electrical System Lighting:
Headlights, taillights, interior lighting, bulb replacement
Electrical System Accessories:
Wipers, power windows, mirrors, horn, audio system
Body Exterior:
Body panel removal/installation, doors, hood, trunk, bumpers
Body Interior:
Dashboard, seats, door panels, trim components, headliner
HVAC System:
Air conditioning, heating, climate control, refrigerant servicing
Safety Systems:
Airbags, seatbelts, SRS system diagnosis and repair
Diagnostic Troubleshooting:
OBD-II codes, diagnostic procedures, wiring diagrams
Preventive Maintenance:
Oil changes, filter replacements, fluid checks, belt inspections
Scheduled Maintenance:
Detailed service intervals for all major maintenance tasks
Repair Procedures:
Step-by-step instructions for component replacement and repair
Overhaul Procedures:
Complete engine and transmission rebuild instructions
Troubleshooting Guides:
Diagnostic flowcharts for common and complex issues
Electrical Diagnosis:
Wiring diagrams, component testing procedures, fault tracing
Body Repair:
Panel alignment, dent repair, rust prevention guidance
Depth:
Comprehensive (from basic maintenance to full engine rebuilds and diagnostics)
Detail Level:
Includes torque specifications, clearances, tolerances, and diagnostic parameter ranges
Engine Code Impreza 2.5I:
EJ253
Engine Type Impreza 2.5I:
Naturally Aspirated Boxer-4
Displacement Impreza 2.5I:
2.5 Liters (2457 cc)
Bore Stroke Impreza 2.5I:
99.5 mm x 79.0 mm
Compression Ratio Impreza 2.5I:
9.7:1
Horsepower Impreza 2.5I:
173 hp @ 5600 rpm
Torque Impreza 2.5I:
166 lb-ft @ 4000 rpm
Fuel System Impreza 2.5I:
Electronic Fuel Injection (EFI), Sequential Multi-Point
Engine Type Wrx:
Turbocharged Boxer-4
Displacement Wrx:
2.5 Liters (2457 cc)
Horsepower Wrx:
224 hp @ 5200 rpm
Torque Wrx:
226 lb-ft @ 3200 rpm
Turbocharger:
IHI VF40 (WRX), Mitsubishi TD04 (STI - depending on specific model year/region)
Fuel Type Recommended:
Unleaded gasoline (91 octane or higher recommended for WRX/STI)
Wheelbase:
Approx. 103.0 inches (2616 mm)
Length:
Approx. 179.7 inches (4564 mm)
Width:
Approx. 68.7 inches (1745 mm)
Height:
Approx. 57.0 inches (1448 mm)
Curb Weight 2.5I:
Approx. 3100-3300 lbs (1406-1497 kg), depending on transmission and trim
Curb Weight Wrx:
Approx. 3250-3450 lbs (1474-1565 kg), depending on trim
Gvw Approx:
Approx. 4300 lbs (1950 kg)
Trunk Volume Sedan:
Approx. 11.4 cubic feet (323 Liters)
Trunk Volume Wagon Hatchback:
Approx. 19.6 cubic feet (555 Liters) (seats up), 40.0 cubic feet (1133 Liters) (seats down)
NHTSA Front Crash Test:
5-Star (for driver and passenger, model dependent)
NHTSA Side Impact Crash Test:
5-Star (for front and rear passengers, model dependent)
IIHS Front Offset Crash Test:
Good (for 2007 model year)
ABS:
Standard Anti-lock Braking System (ABS)
Ebd:
Standard Electronic Brake-force Distribution (EBD)
Traction Control:
Standard Traction Control System (TCS) and Vehicle Dynamics Control (VDC) on many trims
Airbags Front:
Standard front dual-stage airbags
Airbags Side:
Optional or standard front side-impact airbags and side curtain airbags (depending on trim)
Seatbelts:
3-point seatbelts with pretensioners and load limiters
Oil Change Interval Typical:
Every 3,750 miles (6,000 km) or 6 months, whichever comes first (under severe driving conditions) or 7,500 miles (12,000 km) or 12 months (under normal driving conditions)
Air Filter Replacement:
Every 15,000-30,000 miles (24,000-48,000 km) or as needed
Cabin Air Filter Replacement:
Every 15,000-30,000 miles (24,000-48,000 km) or annually
Spark Plug Replacement:
Every 60,000-100,000 miles (96,000-160,000 km) depending on type (NGK iridium recommended)
Coolant Flush Interval:
Every 30,000 miles (48,000 km) or 2 years
Transmission Fluid Change Manual:
Every 30,000 miles (48,000 km) or 2 years
Transmission Fluid Change Automatic:
Every 30,000 miles (48,000 km) or 2 years (more frequent for severe use)
Engine Oil Spec:
SAE 5W-30, API SG, SH, SJ, SL, SM or ILSAC GF-3
Engine Oil Capacity With Filter:
Approx. 4.8 US quarts (4.5 Liters)
Coolant Type:
Subaru Super Coolant (Blue) or equivalent ethylene glycol-based coolant
Brake Fluid Spec:
DOT 3 or DOT 4
Power Steering Fluid Spec:
Subaru Automatic Transmission Fluid (ATF) or equivalent Dexron III
Head Gaskets:
While less prevalent in this generation compared to earlier EJ25 engines, monitor for coolant leaks, overheating, or milky oil.
Catalytic Converter:
Can become clogged over time, leading to reduced performance. Regular checks for efficiency are advised.
Wheel Bearings:
Can wear out, causing humming or grinding noises. Routine inspection is recommended.
Clutch Wear:
Wear can occur with aggressive driving or high mileage, especially on performance models.
Cv Axle Boots:
Tearing of CV axle boots can lead to grease loss and eventual joint failure. Inspect for damage.