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2008 Subaru Impreza WRX & STI Workshop Service Repair Manual

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🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX & STI Year: 2008 Codes Chassis Code: GE/GH (AWD) 👋 Introduction Market Position Segment: Performance Compact Sedan/Hatchback Competitive Analysis Competitors: Mitsubishi Lancer Evolution, Volkswagen Golf GTI, Ford Focus RS, Mazdaspeed3. Key Features Performance Focus: Turbocharged Boxer engines, Symmetrical All-Wheel Drive, rally-bred heritage. Target Audience: Enthusiast drivers, DIY mechanics, performance tuning community. Manual Value Proposition Utility: Enables owners and mechanics to perform all maintenance and repairs, maximizing vehicle lifespan and performance. 📋 Manual Details Coverage Areas Main Coverage: 2008 Subaru Impreza WRX and STI (GE/GH Chassis) Page Count Estimated Pages: 1500+ Manual Type Type: Factory Service Repair Workshop Manual Language Language: English Format Format: PDF (Digital Download) 📖 Manual Coverage Systems Covered Engine Mechanical: Engine assembly, disassembly, inspection, overhaul, cylinder head, block, crankshaft, pistons, connecting rods, camshafts, timing system. Engine Management: Fuel injection, ignition system, emission control systems, ECU, sensors, actuators, troubleshooting. Transmission Manual: Clutch, gearbox operation, disassembly, assembly, inspection, maintenance (for 5-speed and 6-speed manual transmissions). Transmission Automatic: N/A for WRX/STI performance variants, but might cover if applicable to specific market trims not detailed. Drivetrain: All-Wheel Drive (AWD) system, center differential, rear differential, drive shafts, axles, wheel bearings. Suspension: Front and rear suspension components, springs, shock absorbers, control arms, stabilizer bars, alignment specifications. Brakes: Brake system diagnosis, front and rear disc brakes, ABS (Anti-lock Braking System), EBD (Electronic Brake-force Distribution), brake fluid, components. Steering: Power steering system, steering rack, column, linkage, troubleshooting. Electrical System: Battery, charging system, starter motor, lighting, power windows, locks, wipers, horn, fuses, relays, wiring diagrams. Climate Control: HVAC system, air conditioning, heating, ventilation, blower motor, refrigerant. Body And Chassis: Body panel removal and installation, door mechanisms, interior trim, exterior trim, chassis structure, corrosion protection. Safety Systems: Airbag system, seat belt systems, SRS (Supplemental Restraint System) diagnosis and components. Procedures Included Maintenance: Oil changes, filter replacements, spark plug replacement, fluid checks and changes, belt inspection and replacement. Troubleshooting: Diagnostic trouble codes (DTCs), symptom-based troubleshooting, electrical diagnostics. Repair: Component removal, installation, and overhaul for all major systems. Disassembly Assembly: Complete step-by-step procedures for full vehicle disassembly and reassembly. Specifications: Torque specifications, clearances, fluid capacities, electrical values, measurement data. Technical Depth Depth: Comprehensive: Covers basic maintenance to complete engine and transmission rebuilds, detailed electrical diagnostics, and bodywork. 📊 Manual Specifications File Format Quality: High-resolution, searchable PDF with clear text and legible illustrations. Print Quality Printability: All pages are fully printable, allowing for convenient workshop use. Binding Type Binding: N/A (Digital Download - PDF) Paper Type Paper Type: N/A (Digital Download - PDF) ⚙️ Engine Specifications Primary Engine Wrx Engine Code: EJ255 Displacement: 2.5 Liters (2457 cc) Configuration: Horizontally Opposed (Boxer) 4-Cylinder, Turbocharged Horsepower Wrx: 224 hp @ 5200 rpm (JDM), 265 hp @ 5600 rpm (USDM) Torque Wrx: 236 lb-ft @ 2800 rpm (JDM), 244 lb-ft @ 3600 rpm (USDM) Primary Engine Sti Engine Code: EJ257 Displacement: 2.5 Liters (2457 cc) Configuration: Horizontally Opposed (Boxer) 4-Cylinder, Twin-Scroll Turbocharged Horsepower Sti: 305 hp @ 6000 rpm (USDM), 300 hp @ 6200 rpm (JDM/Euro) Torque Sti: 290 lb-ft @ 4000 rpm (USDM), 290 lb-ft @ 4000 rpm (JDM/Euro) Fuel System Type: Sequential Multi-Port Fuel Injection (MPI) Recommended Fuel: Premium Unleaded Gasoline (91 octane or higher) Performance 0 60 Mph Wrx: Approx. 5.3 seconds 0 60 Mph Sti: Approx. 4.4 seconds 🔧 Transmission Standard Wrx Transmission: 5-Speed Manual Sti Transmission: 6-Speed Manual (with Driver Controlled Center Differential - DCCD) Optional Optional Transmission: N/A for performance models Features AWD System: Symmetrical All-Wheel Drive Sti Dccd: Driver Controlled Center Differential for manual torque distribution adjustments. 📐 Dimensions Exterior Sedan Length: 179.9 inches Width: 70.7 inches Height: 58.1 inches Exterior Hatchback Length: 173.8 inches Width: 70.7 inches Height: 57.7 inches Wheelbase Wheelbase: 103.0 inches Weights Curb Weight Wrx: 3197 lbs (Sedan) Curb Weight Sti: 3373 lbs (Sedan) 🛡️ Safety Features Ratings NHTSA Frontal Driver: 5-Star (2008 Impreza models) NHTSA Frontal Passenger: 5-Star (2008 Impreza models) NHTSA Side Driver: 5-Star (2008 Impreza models) NHTSA Side Passenger: 5-Star (2008 Impreza models) NHTSA Side Rear: 4-Star (2008 Impreza models) IIHS Front Crash Rating: Good (2008 Impreza models) IIHS Side Crash Rating: Good (2008 Impreza models) IIHS Rear Crash Rating: Good (2008 Impreza models) Active Features ABS: Standard (Anti-lock Braking System) Ebd: Standard (Electronic Brake-force Distribution) Traction Control: Standard (VDC - Vehicle Dynamics Control, with Off-road mode) Subaru AWD: Symmetrical All-Wheel Drive as a core safety feature for traction. Passive Features Airbags: Front, side-curtain, and driver's knee airbags (depending on trim and market). Seatbelts: 3-point height-adjustable front seatbelts with pretensioners and load limiters. Child Seat Anchors: LATCH (Lower Anchors and Tethers for CHildren) system. 💡 Technology Features Infotainment Head Unit: Base models featured AM/FM/CD stereo; optional upgraded audio systems with subwoofer available. Display: Multi-function display for clock, outside temperature, fuel economy, and system warnings. Driver Assistance Cruise Control: Standard Trip...
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2008 Subaru Impreza WRX & STI Workshop Service Repair Manual
🏷️ Basic Information
Identification
Make:
Subaru
Model:
Impreza WRX & STI
Year:
2008
Codes
Chassis Code:
GE/GH (AWD)
👋 Introduction
Market Position
Segment:
Performance Compact Sedan/Hatchback
Competitive Analysis
Competitors:
Mitsubishi Lancer Evolution, Volkswagen Golf GTI, Ford Focus RS, Mazdaspeed3.
Key Features
Performance Focus:
Turbocharged Boxer engines, Symmetrical All-Wheel Drive, rally-bred heritage.
Target Audience:
Enthusiast drivers, DIY mechanics, performance tuning community.
Manual Value Proposition
Utility:
Enables owners and mechanics to perform all maintenance and repairs, maximizing vehicle lifespan and performance.
📋 Manual Details
Coverage Areas
Main Coverage:
2008 Subaru Impreza WRX and STI (GE/GH Chassis)
Page Count
Estimated Pages:
1500+
Manual Type
Type:
Factory Service Repair Workshop Manual
Language
Language:
English
Format
Format:
PDF (Digital Download)
📖 Manual Coverage
Systems Covered
Engine Mechanical:
Engine assembly, disassembly, inspection, overhaul, cylinder head, block, crankshaft, pistons, connecting rods, camshafts, timing system.
Engine Management:
Fuel injection, ignition system, emission control systems, ECU, sensors, actuators, troubleshooting.
Transmission Manual:
Clutch, gearbox operation, disassembly, assembly, inspection, maintenance (for 5-speed and 6-speed manual transmissions).
Transmission Automatic:
N/A for WRX/STI performance variants, but might cover if applicable to specific market trims not detailed.
Drivetrain:
All-Wheel Drive (AWD) system, center differential, rear differential, drive shafts, axles, wheel bearings.
Suspension:
Front and rear suspension components, springs, shock absorbers, control arms, stabilizer bars, alignment specifications.
Brakes:
Brake system diagnosis, front and rear disc brakes, ABS (Anti-lock Braking System), EBD (Electronic Brake-force Distribution), brake fluid, components.
Steering:
Power steering system, steering rack, column, linkage, troubleshooting.
Electrical System:
Battery, charging system, starter motor, lighting, power windows, locks, wipers, horn, fuses, relays, wiring diagrams.
Climate Control:
HVAC system, air conditioning, heating, ventilation, blower motor, refrigerant.
Body And Chassis:
Body panel removal and installation, door mechanisms, interior trim, exterior trim, chassis structure, corrosion protection.
Safety Systems:
Airbag system, seat belt systems, SRS (Supplemental Restraint System) diagnosis and components.
Procedures Included
Maintenance:
Oil changes, filter replacements, spark plug replacement, fluid checks and changes, belt inspection and replacement.
Troubleshooting:
Diagnostic trouble codes (DTCs), symptom-based troubleshooting, electrical diagnostics.
Repair:
Component removal, installation, and overhaul for all major systems.
Disassembly Assembly:
Complete step-by-step procedures for full vehicle disassembly and reassembly.
Specifications:
Torque specifications, clearances, fluid capacities, electrical values, measurement data.
Technical Depth
Depth:
Comprehensive: Covers basic maintenance to complete engine and transmission rebuilds, detailed electrical diagnostics, and bodywork.
📊 Manual Specifications
File Format
Quality:
High-resolution, searchable PDF with clear text and legible illustrations.
Print Quality
Printability:
All pages are fully printable, allowing for convenient workshop use.
Binding Type
Binding:
N/A (Digital Download - PDF)
Paper Type
Paper Type:
N/A (Digital Download - PDF)
⚙️ Engine Specifications
Primary Engine Wrx
Engine Code:
EJ255
Displacement:
2.5 Liters (2457 cc)
Configuration:
Horizontally Opposed (Boxer) 4-Cylinder, Turbocharged
Horsepower Wrx:
224 hp @ 5200 rpm (JDM), 265 hp @ 5600 rpm (USDM)
Torque Wrx:
236 lb-ft @ 2800 rpm (JDM), 244 lb-ft @ 3600 rpm (USDM)
Primary Engine Sti
Engine Code:
EJ257
Displacement:
2.5 Liters (2457 cc)
Configuration:
Horizontally Opposed (Boxer) 4-Cylinder, Twin-Scroll Turbocharged
Horsepower Sti:
305 hp @ 6000 rpm (USDM), 300 hp @ 6200 rpm (JDM/Euro)
Torque Sti:
290 lb-ft @ 4000 rpm (USDM), 290 lb-ft @ 4000 rpm (JDM/Euro)
Fuel System
Type:
Sequential Multi-Port Fuel Injection (MPI)
Recommended Fuel:
Premium Unleaded Gasoline (91 octane or higher)
Performance
0 60 Mph Wrx:
Approx. 5.3 seconds
0 60 Mph Sti:
Approx. 4.4 seconds
🔧 Transmission
Standard
Wrx Transmission:
5-Speed Manual
Sti Transmission:
6-Speed Manual (with Driver Controlled Center Differential - DCCD)
Optional
Optional Transmission:
N/A for performance models
Features
AWD System:
Symmetrical All-Wheel Drive
Sti Dccd:
Driver Controlled Center Differential for manual torque distribution adjustments.
📐 Dimensions
Exterior Sedan
Length:
179.9 inches
Width:
70.7 inches
Height:
58.1 inches
Exterior Hatchback
Length:
173.8 inches
Width:
70.7 inches
Height:
57.7 inches
Wheelbase
Wheelbase:
103.0 inches
Weights
Curb Weight Wrx:
3197 lbs (Sedan)
Curb Weight Sti:
3373 lbs (Sedan)
🛡️ Safety Features
Ratings
NHTSA Frontal Driver:
5-Star (2008 Impreza models)
NHTSA Frontal Passenger:
5-Star (2008 Impreza models)
NHTSA Side Driver:
5-Star (2008 Impreza models)
NHTSA Side Passenger:
5-Star (2008 Impreza models)
NHTSA Side Rear:
4-Star (2008 Impreza models)
IIHS Front Crash Rating:
Good (2008 Impreza models)
IIHS Side Crash Rating:
Good (2008 Impreza models)
IIHS Rear Crash Rating:
Good (2008 Impreza models)
Active Features
ABS:
Standard (Anti-lock Braking System)
Ebd:
Standard (Electronic Brake-force Distribution)
Traction Control:
Standard (VDC - Vehicle Dynamics Control, with Off-road mode)
Subaru AWD:
Symmetrical All-Wheel Drive as a core safety feature for traction.
Passive Features
Airbags:
Front, side-curtain, and driver's knee airbags (depending on trim and market).
Seatbelts:
3-point height-adjustable front seatbelts with pretensioners and load limiters.
Child Seat Anchors:
LATCH (Lower Anchors and Tethers for CHildren) system.
💡 Technology Features
Infotainment
Head Unit:
Base models featured AM/FM/CD stereo; optional upgraded audio systems with subwoofer available.
Display:
Multi-function display for clock, outside temperature, fuel economy, and system warnings.
Driver Assistance
Cruise Control:
Standard
Trip Computer:
Integrated into the multi-function display.
Connectivity
Audio Input:
Auxiliary audio input jack on some models.
🔧 Maintenance
Service Intervals
Oil Change Interval:
Every 3,750 miles or 6 months (severe driving), or 7,500 miles or 12 months (normal driving). Consult manual for specific conditions.
Air Filter Replacement:
Check every 15,000 miles, replace as needed or every 30,000 miles.
Cabin Air Filter Replacement:
Check every 15,000 miles, replace as needed or every 15,000-30,000 miles.
Spark Plug Replacement:
Iridium-tipped plugs typically good for 60,000 miles, but check manual.
Timing Belt Replacement:
N/A for EJ255/EJ257 engines; they use a timing chain.
Fluid Specifications
Engine Oil Type:
SAE 5W-30 Synthetic (API SG, SH, SJ, SL, SM or ILSAC GF-2, GF-3, GF-4).
Engine Oil Capacity:
4.8 US quarts (4.5 Liters) with filter change.
Coolant Type:
Subaru Super Coolant (Blue) or equivalent silicate-free antifreeze.
Transmission Fluid Manual:
API GL-4 75W-90 Gear Oil (for 5-speed) or API GL-5 75W-90 Gear Oil (for 6-speed STI). Refer to manual for exact Subaru specs.
Differential Fluid Front:
API GL-5 75W-90 Gear Oil
Differential Fluid Rear:
API GL-5 75W-90 Gear Oil (for WRX), Subaru Limited Slip Differential Oil (for STI VLSD).
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid.
Known Issues
Head Gaskets:
While later EJ engines are generally more reliable than earlier ones, head gasket leaks can still occur, particularly with modifications or heavy use.
Piston Ringland Failure:
More common in heavily modified or aggressively driven EJ25 engines (especially EJ257) due to detonation or excessive boost. Manual covers engine inspection and repair procedures to mitigate this.
Clutch Wear:
Performance clutches can wear faster with aggressive driving; manual details clutch inspection and replacement.
Turbocharger Issues:
Turbo seals can degrade over time; regular oil changes and proper cool-down procedures are crucial. Manual details turbocharger inspection and replacement.
📚 Vehicle History
Brand Heritage
Subaru Rally Legacy:
Subaru's long-standing success in the World Rally Championship (WRC) heavily influenced the development of the WRX and STI models.
Model Evolution
Third Generation Impreza:
The 2008 model marks the beginning of the third generation (GE/GH chassis), introducing a significant redesign with a more rounded, less angular aesthetic compared to the previous GD generation.
Styling Change:
The 'hawkeye' (2006-2007) styling was replaced by a 'wide body' design on certain WRX and all STI models, improving track width and stability.
Production
Manufacturing Location:
Gunma Manufacturing Plant, Gunma Prefecture, Japan.
🏆 Awards & Recognition
Recognitions
Car And Driver 10Best:
The Subaru Impreza WRX/STI has frequently appeared on Car and Driver's 10Best lists in previous generations, establishing its performance credentials.
Rally Heritage Recognition:
Continuously recognized for its motorsport-derived technology and rally heritage.
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