🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2004 Codes Chassis Code: GDB Engine Code: EJ207 👋 Introduction Market Position Positioning: The 2004 Subaru Impreza WRX STI (also known as GDB) is a rally-bred, turbocharged performance sedan, a homologation special designed for motorsport. It is positioned as a premium, high-performance compact car. Competitive Analysis Competitors: Competes with other performance-oriented compacts of its era, such as the Mitsubishi Lancer Evolution, Volkswagen Golf GTI, and Ford Focus RS. Key Features Performance Highlights: Symmetrical All-Wheel Drive (AWD), turbocharged boxer engine, advanced differential systems, potent braking, and a driver-focused chassis. Manual Purpose: Provides authoritative, in-depth technical information for accurate diagnosis, repair, and maintenance, crucial for preserving the performance and longevity of this specialized vehicle. 📋 Manual Details Coverage Areas General Coverage: Comprehensive repair and maintenance for the 2004 Subaru Impreza WRX STI. Page Count Total Pages: 3000+ Manual Type Type: Workshop Service Manual / Repair Manual Language Language: English Format Format: PDF (Digital Download) 📖 Manual Coverage Systems Covered Powertrain: Engine, Transmission, Drivetrain, Fuel System, Exhaust System. Chassis: Suspension (front and rear), Steering System, Braking System, Wheels and Tires. Electrical: Wiring Diagrams, Ignition System, Starting System, Charging System, Lighting, Instrumentation, ECUs. Body And Interior: Body Panels, Doors, Windows, Seats, Trim, HVAC System, Restraint Systems (Airbags). Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, fluid checks and top-offs. Diagnostics: Troubleshooting guides, diagnostic trouble codes (DTCs) interpretation, component testing. Repair And Rebuild: Step-by-step repair procedures for major components (engine, transmission, suspension, brakes). Adjustments: Valve clearance adjustments, clutch adjustments, alignment procedures. Technical Depth Depth: Detailed diagnostic procedures, component removal and installation, specifications, tolerances, and torque values for most repairs. 📊 Manual Specifications File Format PDF Quality: High-resolution, searchable PDF with printable pages. Print Quality Printability: Optimized for printing with clear diagrams and text. Binding Type Binding: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: Horizontally Opposed (Boxer), Turbocharged, Intercooled Engine Code: EJ207 Displacement: 2.0 Liters (1994 cc) Performance Horsepower Ps: 265 PS (approx. 261 hp) Torque Nm: 343 Nm (approx. 253 lb-ft) Fuel System Injection Type: Multi-Point Fuel Injection (MPI), Electronic Fuel Injection (EFI) Fuel Type: Premium Unleaded Gasoline (98 RON recommended) Internal Components Pistons: Forged Crankshaft: Cross-plane, forged Cooling System Coolant Type: Subaru Super Coolant or equivalent (Ethylene Glycol based) 🔧 Transmission Standard Transmission Type: 6-Speed Manual Transmission Optional Optional Transmission: N/A (Manual transmission only for STI) Features Drivetrain: Symmetrical All-Wheel Drive (AWD) with Driver-Controlled Center Differential (DCCD) Differentials: Front: Helical LSD, Rear: Viscous LSD Fluid Specifications Transmission Fluid Type: API GL-5, SAE 75W-90 (manual gearbox); Subaru Extra LPS Fluid (transfer case/rear diff, if applicable) 📐 Dimensions Exterior Length Mm: 4405 Width Mm: 1770 Height Mm: 1410 Wheelbase Mm: 2525 Weights Curb Weight Kg: 1430 Gross Vehicle Weight Kg: 1900 Wheels And Tires Wheel Size: 17 x 7.5 inches Tire Size: 225/45R17 Bolt Pattern: 5 x 100 mm Offset: +53mm 🛡️ Safety Features Ratings NHTSA Front Impact: Not rated (historical data may vary) IIHS Front Impact: Good (for 2004 model year Impreza range, STI specific rating may differ) Active Features ABS: Standard (4-wheel ABS) Traction Control: Standard (Symmetrical AWD, DCCD) Passive Features Airbags: Driver and Front Passenger Airbags Seatbelts: 3-point front and rear seatbelts with pretensioners Chassis Design Body Structure: Reinforced chassis with crumple zones and energy-absorbing structure. 💡 Technology Features Infotainment Audio System: Factory AM/FM/CD stereo system with basic speaker configuration. Aftermarket upgrades are common. Driver Assistance Stability Control: Not equipped with Electronic Stability Control (ESC) in the modern sense; relies on AWD and differential systems for stability. Connectivity Auxiliary Input: Typically no auxiliary input; older models may have tape decks or limited CD functionality. Instrumentation Dashboard Features: Driver-focused layout with tachometer, speedometer, boost gauge, oil pressure, and temperature gauges. 🔧 Maintenance Service Intervals Oil Change Interval Km: Every 5,000 km or 6 months (severe use), 7,500-10,000 km or 12 months (normal use) Spark Plug Replacement Km: 100,000 km (Iridium type) Timing Belt Replacement Km: 105,000 km or 7 years (whichever comes first) Fluid Specifications Engine Oil Type: API SG/SH/SJ/SL/SM, ACEA A3/B3 or A3/B4, Viscosity: 0W-30, 5W-30, 5W-40, 10W-30, 10W-40 (refer to manual for specific conditions) Engine Oil Capacity Liters: 4.2 L (without filter), 4.5 L (with filter) Coolant Capacity Liters: 7.5 L Brake Fluid Type: DOT 3 or DOT 4 Known Issues Engine Reliability: EJ207 engine is robust but susceptible to ringland failure if consistently abused or poorly tuned. Regular maintenance is critical. Head gasket failures can occur with age/heat cycles. Transmission Wear: The 6-speed transmission is strong, but clutch wear is expected with spirited driving. Synchro wear can occur on high-mileage units. Suspension Components: Worn suspension bushings (control arms, sway bars) are common due to spirited driving and age. Wheel bearings can also wear. Electronics: Intermittent issues with sensors (e.g.,...