🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2004 Codes Chassis Code: GDB-F 👋 Introduction Market Position Vehicle Segment: Performance compact sedan/wagon Target Audience: Enthusiast drivers, rally racing fans, DIY mechanics Competitive Analysis Competitors: Mitsubishi Lancer Evolution, Ford Focus RS, Volkswagen Golf GTI/R32 Key Features Performance Attributes: Symmetrical All-Wheel Drive, turbocharged Boxer engine, performance suspension tuning Manual Benefit: Enables owners and technicians to perform all necessary maintenance, diagnostics, and repairs accurately and efficiently. 📋 Manual Details Coverage Areas Primary Coverage: All repair and service procedures Secondary Coverage: Diagnostic procedures, electrical system troubleshooting, mechanical repairs Page Count Estimated Page Count: Estimated 2000+ pages (typical for full factory service manuals of this era) Manual Type Manual Type: Factory Service Repair Manual Language Language: English Format File Format: PDF/ZIP 📖 Manual Coverage Systems Covered Engine Mechanical: Engine assembly, disassembly, inspection, overhaul (EJ257 engine) Engine Management: Fuel injection, ignition system, emissions control, ECU diagnostics Drivetrain Transmission: Manual transmission (TY856WL3CA), clutch system, propeller shaft, differentials (front, center, rear) Chassis Suspension: Front and rear suspension systems, steering system, alignment specifications Chassis Brakes: Brake system components (Brembo front calipers), hydraulic lines, ABS operation Body Exterior: Body panel removal/installation, glass, seals, bumpers, trim Body Interior: Interior trim, seats, dashboard, HVAC system components Electrical System: Complete wiring diagrams, component locations, diagnostic procedures, lighting, power accessories Cooling System: Radiator, cooling fan, water pump, thermostat, coolant specifications Lubrication System: Oil pump, oil filter, oil pressure, lubrication specifications Exhaust System: Catalytic converter, mufflers, exhaust manifold Fuel System: Fuel pump, fuel injectors, fuel lines, fuel filter, fuel tank Air Intake System: Air filter, intercooler, turbocharger (TD04L-13T) Procedures Included Maintenance Procedures: Oil changes, filter replacements, spark plug replacement, fluid checks Troubleshooting Procedures: Diagnosis of common faults, fault code interpretation, wiring schematic analysis Repair Procedures: Engine rebuilds, transmission overhaul, suspension component replacement, brake caliper service Diagnostic Procedures: OBD-II diagnostics, sensor testing, actuator testing Installation Procedures: Component replacement, accessory installation (e.g., audio systems) Technical Depth Depth Level: Comprehensive factory-level detail suitable for professional technicians and experienced DIY enthusiasts Diagnostic Tools: Information on necessary diagnostic tools and equipment Torque Specifications: Detailed torque values for all fasteners Clearances Tolerances: Specifications for engine component clearances and other critical tolerances 📊 Manual Specifications File Format Compatibility: WIN/MAC/LINUX Opening Requirements: Requires unzipper software (e.g., WinRAR) Print Quality Printability: PDF format is generally printable, quality depends on original source and printer capabilities Binding Type Binding Type: Digital (Instant Download) Paper Type Paper Type: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Code: EJ257 Engine Type: 2.5L DOHC 16-valve turbocharged flat-four Boxer engine Performance Horsepower: 280 PS (276 hp) @ 6000 rpm (JDM spec, US spec slightly lower) Torque: 392 Nm (289 lb-ft) @ 4000 rpm (JDM spec, US spec slightly lower) Fuel System Fuel Delivery: Sequential electronic fuel injection (SEFI) Forced Induction: Mitsuibishi TD04L-13T turbocharger with intercooler Ignition System Spark Plugs: NGK PFR7B (iridium type) 🔧 Transmission Standard Transmission Type: 6-speed manual transmission Transmission Model: TY856WL3CA Features Drivetrain: Symmetrical All-Wheel Drive (SAWD) with Driver Controlled Center Differential (DCCD) Differential Type: Helical LSD front, DCCD center, Viscous LSD rear 📐 Dimensions Exterior Length: 4,415 mm (173.8 in) Width: 1,770 mm (69.7 in) Height: 1,410 mm (55.5 in) Weights Curb Weight: Approx. 1,505 kg (3,318 lbs) 🛡️ Safety Features Ratings NHTSA Front Crash Rating: 4/5 stars (for sedan body style, specific STI may vary) Active Features Active Safety: ABS, EBD, Symmetrical AWD, Driver Controlled Center Differential Passive Features Passive Safety: Front airbags, side airbags, front seatbelt pretensioners, crumple zones 💡 Technology Features Infotainment Audio System: Factory radio/CD player, potentially with premium speaker option Driver Assistance Driver Assistance Features: Limited by modern standards; focus on AWD and mechanical grip Connectivity Connectivity Features: Basic; typically CD player and optional cassette 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,750 miles (6,000 km) or 6 months, whichever comes first, using high-quality synthetic oil Timing Belt Replacement: Not applicable (Uses a timing chain) Fluid Specifications Engine Oil Spec: SAE 5W-30, API SG/SH/SJ/SL, ACEA A2/A3 or equivalent (refer to manual for specific Subaru recommendations, often synthetic) Transmission Fluid Spec: API GL-4 SAE 75W-90 (manual transmission, check manual for specific Subaru fluid PN) Differential Fluid Spec: API GL-5 SAE 75W-90 (front and rear), API GL-5 SAE 75W-90 (center differential, check manual) Coolant Spec: Subaru Super Coolant (Blue) or equivalent ethylene glycol-based coolant Known Issues Engine Common Issues: Piston ring land failure (ringland failure), head gasket issues (less common than earlier generations), turbocharger wear Drivetrain Common Issues: Clutch wear, transmission synchro issues (especially 2nd and 3rd gears), DCCD actuator failure Suspension Common Issues: Worn control arm bushings, strut mounts 📚 Vehicle History Brand Heritage Subaru Rally Heritage: Strong ties to World Rally Championship (WRC) success with Colin McRae and Richard Burns Model Evolution Generation: Second generation (GDB) facelift model Production Production Years: 2000-2007 (This generation) 🏆 Awards...