🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2004 Codes Chassis Code: GDB Engine Code: EJ207 👋 Introduction Market Position Market Segment: Performance Compact Sedan/Wagon Target Audience: Enthusiasts, DIY Mechanics, Service Technicians Competitive Analysis Competitors: Mitsubishi Lancer Evolution, Ford Focus RS, Volkswagen Golf GTI Key Features Performance Focus: Iconic turbocharged Boxer engine, rally-bred AWD system, driver-focused cockpit. Manual Value Proposition: Empowers owners and technicians with in-depth knowledge for optimal performance and longevity. 📋 Manual Details Coverage Areas Primary Coverage: Complete Service and Repair Secondary Coverage: Maintenance, Diagnostics, Troubleshooting, Reassembly Page Count Estimated Pages: 1500+ Manual Type Type: Factory Service Manual (FSM) Language Language: English Format Format: Digital Download (PDF) 📖 Manual Coverage Systems Covered Powertrain: Engine (EJ207), Transmission (6-speed manual), Drivetrain (Symmetrical AWD) Chassis: Suspension, Steering, Brakes, Wheels, Tires Body: Exterior Body Panels, Interior Trim, Glass, Doors, Locks Electrical: Wiring Diagrams, Lighting, Instrumentation, ECUs, Audio System HVAC: Heating, Ventilation, Air Conditioning System Emissions: Evaporative Emission Control (EVAP), Exhaust System Procedures Included Maintenance: Oil Changes, Filter Replacements, Spark Plug Replacement, Belt Inspections Engine Repair: Engine Overhaul, Piston and Ring Replacement, Cylinder Head Reconditioning, Turbocharger Service Transmission Repair: Clutch Replacement, Gearbox Disassembly and Reassembly, Differential Service Suspension And Steering Repair: Strut and Shock Absorber Replacement, Ball Joint and Bushing Service, Power Steering System Diagnosis Brake System Repair: Brake Pad and Rotor Replacement, Caliper Service, Bleeding Procedures Electrical Diagnostics: Troubleshooting Shorts, Open Circuits, ECU Fault Codes Troubleshooting: Diagnostic Flowcharts, Symptom-Based Diagnosis Technical Depth Depth: Comprehensive: From basic fluid checks to full engine and transmission rebuilds. Diagnostic Codes: Includes OBD-II diagnostic trouble codes (DTCs) specific to the EJ207 engine and Subaru ECUs. Torque Specifications: Detailed torque specifications for all critical fasteners. Special Tools: Lists required Subaru special tools and their part numbers for specific procedures. 📊 Manual Specifications File Format File Type: PDF Searchability: Searchable text for quick information retrieval. Print Quality: High-resolution scans suitable for printing. Binding Type Binding: N/A (Digital Download) Paper Type Paper: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: 2.0L DOHC 16-Valve Turbocharged Boxer (EJ207) Performance Horsepower Est: 265 hp @ 6000 rpm (JDM/European Spec) Torque Est: 253 lb-ft @ 4000 rpm (JDM/European Spec) Fuel System Injection Type: Multi-point Fuel Injection (MPI) Fuel Requirement: Premium Unleaded Gasoline (91+ Octane Recommended) Cooling System Coolant Type: Subaru Super Coolant (Blue) or equivalent Lubrication Oil Type: SAE 5W-30 or 10W-30 Synthetic Engine Oil Oil Capacity: 4.5 US Quarts (4.3 Liters) with filter 🔧 Transmission Standard Transmission Type: 6-Speed Manual Transmission (TY856WB1AA / TY856WB2AA) Optional Transmission Options: None available for WRX STI model. Features Drivetrain: Symmetrical All-Wheel Drive (AWD) with Driver Controlled Center Differential (DCCD) Fluid Specs Manual Transmission Fluid: Subaru Extra-S Gear Oil GL-5 75W-90 📐 Dimensions Exterior Length: 173.8 inches (4415 mm) Width: 69.7 inches (1770 mm) Height: 57.7 inches (1465 mm) Wheelbase: 100.5 inches (2550 mm) Weights Curb Weight Est: 3285 lbs (1490 kg) Gross Vehicle Weight Rating Est: 4400 lbs (1996 kg) 🛡️ Safety Features Ratings NHTSA Front Impact: Not explicitly rated for 2004 model year, but designed to meet safety standards. IIHS Side Impact: Not explicitly rated for 2004 model year, but designed to meet safety standards. Active Features ABS: Standard Anti-lock Braking System (ABS) Traction Control: Standard Traction Control System (TCS) AWD: Standard Symmetrical All-Wheel Drive Passive Features Airbags: Front Dual Stage Airbags, Front Side-Impact Airbags Seatbelts: 3-Point Height-Adjustable Front Seatbelts with Pretensioners, 3-Point Rear Seatbelts Rollover Protection: Reinforced Body Structure 💡 Technology Features Infotainment Audio System: Standard AM/FM/CD Player with 4-6 speakers, optional premium audio. Display: Basic digital clock and radio display. Driver Assistance Cruise Control: Standard Cruise Control Limited Slip Differentials: Front Helical LSD, Rear Viscous LSD (standard), DCCD for center differential adjustment. Connectivity Auxiliary Input: Not standard; aftermarket solutions often available. 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,750 - 7,500 miles or 6 months, depending on driving conditions (severe vs. normal). Air Filter Replacement: Every 15,000 - 30,000 miles or as needed based on conditions. Spark Plug Replacement: Every 30,000 - 60,000 miles (depending on plug type, iridium recommended). Timing Belt Replacement: Every 105,000 miles or 7 years (crucial for EJ207 engine). Fluid Specifications Brake Fluid: DOT 3 or DOT 4 Brake Fluid Power Steering Fluid: Subaru Genuine Power Steering Fluid or equivalent Dexron III/Mercon ATF Coolant Capacity: Approximately 6.5 US Quarts (6.2 Liters) Known Issues Ring Land Failure: Potential for piston ring land failure under high detonation or prolonged abuse (common concern for modified EJ207s). Clutch Wear: High-performance nature can lead to faster clutch wear with aggressive driving. Head Gasket Leaks: While less common on EJ207 than some other Subaru engines, still a potential area to monitor. Turbocharger Maintenance: Proper oil changes and allowing turbo to cool down are critical to longevity. 📚 Vehicle History Brand Heritage Brand Focus: Subaru's reputation for durable Boxer engines and...