🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2004 Chassis Code: GDB-F Generation: GD Generation Variant: GD/GG (2nd Generation, 'F' model year update) 👋 Introduction Market Position Vehicle Segment: Compact Performance Sedan/Wagon (WRC Homologation Special) Target Audience: Enthusiasts, Owners Seeking In-depth Maintenance and Repair Information Competitive Analysis Key Competitors 2004: Mitsubishi Lancer Evolution VIII, Ford Focus RS, Honda Civic Type R (EP3), Volkswagen Golf GTI Key Features Performance Focus: Tuned turbocharged engine, Symmetrical All-Wheel Drive, Driver-focused chassis tuning Rally Heritage: Direct lineage from WRC success, providing rally-bred performance Manual Value Proposition: Enables owners to perform complex maintenance and repairs, enhancing vehicle longevity and performance potential. 📋 Manual Details Coverage Areas Main Coverage: Complete Service and Repair Manual Engine Coverage: EJ257 Turbocharged Boxer Engine Transmission Coverage: 6-speed Manual Transmission (TY856WR1JJ) Chassis Coverage: Suspension, Steering, Brakes, Drivetrain (AWD System) Body Coverage: Exterior and Interior Body Panels, Doors, Glass, Bumpers, Trim Electrical Coverage: Wiring Diagrams, Fuses, Relays, Lighting, ECUs, Sensors Acoustics Coverage: Noise, Vibration, and Harshness (NVH) Control Page Count Estimated Pages: Over 2000 Manual Type Type: Factory Service Manual (FSM) / Workshop Manual Language Language: English Format Delivery Format: Downloadable Digital File Archival Format: WinRAR Archive (.rar) 📖 Manual Coverage Systems Covered Powertrain: Engine, Fuel System, Ignition System, Exhaust System, Turbocharger System, Drivetrain, Transmission, Differentials (Front, Center, Rear) Chassis And Suspension: Front and Rear Suspension, Steering System, Brake System (ABS, Brake Booster, Master Cylinder, Calipers, Rotors, Lines), Wheel Hubs, Bearings Body And Interior: Body Panel Removal/Installation, Doors, Hood, Trunk, Seats, Interior Trim, Glass Replacement, HVAC System Electrical And Electronics: Engine Control Unit (ECU), Body Control Module (BCM), Powertrain Control Module (PCM), Wiring Diagrams, Fuses, Relays, Lighting Systems (Headlights, Taillights, Interior), Audio System, Power Accessories, SRS (Airbag) System Procedures Included Diagnostics: Troubleshooting Charts, Diagnostic Trouble Codes (DTCs), Symptom-based Diagnostics, Component Testing Maintenance: Scheduled Maintenance, Oil Changes, Filter Replacements, Fluid Checks and Replacements, Spark Plug Replacement, Belt Inspection and Replacement Repair: Engine Overhaul, Turbocharger Rebuild/Replacement, Transmission Overhaul/Replacement, Clutch Replacement, Brake Pad/Rotor Replacement, Suspension Component Replacement, Electrical Component Repair, Body Panel Repair Installation: Component Installation and Removal (e.g., Engine, Transmission, Turbocharger, Suspension Components, Body Panels) Adjustment: Valve Clearance Adjustment, Clutch Pedal Adjustment, Handbrake Adjustment Technical Depth Depth Level: Comprehensive (from basic checks to full engine/transmission rebuilds) Diagnostic Capability: Advanced Diagnostic Procedures, Component Resistance and Voltage Checks, Sensor Signal Analysis Rebuild Specifications: Detailed Torque Specifications, Clearances, Assembly Procedures for Major Components 📊 Manual Specifications File Format Digital Format: PDF (likely extracted from original FSM) Searchability: Likely searchable text within PDF, depending on scan quality Print Quality Visual Quality: Variable (dependent on original source scans/creation) Binding Type Binding: N/A (Digital Download) Paper Type Paper Quality: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Code: EJ257 Engine Type: Horizontally-Opposed (Boxer), 4-Cylinder, 16-Valve, DOHC, Turbocharged Displacement: 2.5 Liters (2457 cc) Bore X Stroke: 99.5 mm x 79.0 mm Performance Horsepower Usdm: 300 hp @ 6000 rpm Torque Usdm: 300 lb-ft @ 4000 rpm Compression Ratio: 8.2:1 Turbocharger Model: IHI VF39 Intercooler Type: Air-to-Air Top-Mount Intercooler Fuel System Fuel Delivery: Sequential Multi-Port Fuel Injection (MPI) Fuel Type: Unleaded Premium Gasoline (91+ Octane Recommended) Fuel Pump: High-flow electric fuel pump Fluid Capacity Engine Oil Capacity: 4.8 US quarts (4.5 liters) with filter change Fluid Specifications Engine Oil Viscosity: 5W-30 (API SG or SH grade, or equivalent) Engine Management ECU Type: Engine Control Unit (ECU) with specific STI calibration 🔧 Transmission Standard Type: 6-Speed Manual Transmission Model Code: TY856WR1JJ Optional Availability: N/A (STI model exclusively 6MT) Features Drivetrain Layout: Symmetrical All-Wheel Drive (AWD) with Driver Controlled Center Differential (DCCD) Front Differential: Open Differential Rear Differential: Viscous Limited Slip Differential (VLSD) Fluid Capacity Transmission Fluid Capacity: 2.2 US quarts (2.1 liters) Fluid Specifications Transmission Fluid Type: API GL-5, SAE 75W-90 Gear Oil (Subaru Extra-S recommended) Clutch Type: Hydraulically operated, single dry plate, diaphragm spring clutch 📐 Dimensions Exterior Length: 173.8 inches (4415 mm) Width: 69.7 inches (1770 mm) Height: 57.7 inches (1465 mm) Wheelbase: 104.7 inches (2659 mm) Front Track: 59.8 inches (1519 mm) Rear Track: 59.3 inches (1506 mm) Weights Curb Weight: 3285 lbs (1490 kg) approx. Gross Vehicle Weight Rating: 4299 lbs (1950 kg) Towing Capacity: Not Recommended/Specified Cargo Trunk Volume: 11.3 cubic feet (Sedan) Wheels And Tires Standard Wheel Size: 17 x 7.5 inches Standard Tire Size: 225/45R17 Bolt Pattern: 5 x 114.3 mm (5 x 4.5 inches) Wheel Offset: +53 mm 🛡️ Safety Features Ratings NHTSA Frontal Driver: 5-Star (for 2004 model year Impreza) NHTSA Frontal Passenger: 5-Star (for 2004 model year Impreza) IIHS Moderate Overlap Frontal: Good (for comparable 2nd Gen Impreza models) Active Features ABS: Standard Anti-lock Braking System (ABS) E-Brake: Rear Drum Parking Brake Passive Features Airbags: Driver and Passenger Frontal Airbags, Side Airbags (optional on some trims) Seatbelts: 3-point Front and Rear Seatbelts with pretensioners Body Structure: Ring-shaped reinforcement frame, reinforced...