🏷️ Basic Information Identification Make: Subaru Model: Impreza Model Variants: Impreza WRX, Impreza WRX STi Model Year: 2004 👋 Introduction Market Position Target Audience: DIY enthusiasts, home mechanics, Subaru WRX/STi owners Competitive Analysis Value Proposition: High-quality, complete official service information, superior to cheaper, incomplete alternatives Key Features Manual Attributes: Complete, informative, official, high-quality, diagrams, illustrations, troubleshooting, detailed specifications 📋 Manual Details Coverage Areas Covered Models: 2004 Subaru Impreza, Impreza WRX, Impreza WRX STi (all models covered) Page Count Completeness: Complete, no missing pages Manual Type Type: Workshop Repair & Service Manual Language Language: English Format File Format: PDF Delivery Method Delivery: Instant download link via email after payment Customer Support Guarantee: Customer Satisfaction Guaranteed, issue resolution within hours Refund Policy Policy: Replacement link or 100% refund if there are problems or if seller is at fault 📖 Manual Coverage Systems Covered Engine Service: Complete engine service, disassembly, reassembly, engine removal Fuel System: Fuel and Lubrication Systems, Carb Rebuild, Carb Adjustments (where applicable) Electrical System: Ignition, Charging, Starter, Battery, Switches, Wiring Diagrams Chassis Suspension Steering: Wheels, Brakes, Steering, Suspension, Axles, CV Joint Service Procedures, U-Joint Service Procedures, Front Suspension Transmission Drivetrain: Gearbox Service, Gearbox Removal and Installation, Clutch Removal and Installation, Transmission Bodywork Exterior: Bodywork Cooling Exhaust: Cooling System, Exhaust System, Exhaust Service Procedures Included Maintenance Tune Up: Periodic Maintenance and Tune-Up Procedures, Factory Maintenance Schedules Diagnostics Troubleshooting: Fault Finding Repair Rebuild: All Factory Repair Procedures, Detailed Specifications Technical Depth Depth: Comprehensive DIY repair, access to professional technician information, complete rebuilds Technical Areas General Information: General Information, Specifications, Lube Points, Oil Types Tools And Torques: Tools, Tightening Torques, Service Data Wiring And Routing: Wire/Cable/Hose Routing Documentation Style Illustrations: Abundant Illustrations, Lots of pictures & diagrams 📊 Manual Specifications File Format Compatibility: Cross-platform PDF, works on Windows/Mac/Linux Print Quality Printability: Printable manual with diagrams Binding Type Digital Format: Digital Download (Instant Delivery) Paper Type User Access: Unlimited use, no restrictions ⚙️ Engine Specifications Primary Engine Engine Type: Turbocharged Boxer (EJ205 for WRX, EJ257 for STi - specific variant coverage depends on manual detail) Performance Typical Horsepower Wrx: Approximately 227 hp @ 5600 rpm Typical Torque Wrx: Approximately 217 lb-ft @ 3500 rpm Typical Horsepower Sti: Approximately 300 hp @ 6000 rpm Typical Torque Sti: Approximately 300 lb-ft @ 4000 rpm Fuel System Fuel Delivery: Electronic Fuel Injection (EFI) Engine Management Ignition System: Distributorless Ignition System (DIS) with Coil-on-Plug (COP) Engine Firing Order: 1-3-2-4 Engine Variants Engine Codes: EJ205 (WRX), EJ257 (STi) Engine Features Forced Induction: Turbocharged 🔧 Transmission Standard Type: 5-speed Manual (WRX), 6-speed Manual (STi) Optional Automatic Transmission: Not typically offered for WRX/STi models in this generation Features Drivetrain: All-Wheel Drive (AWD) with Active Torque Split (Subaru's Symmetrical AWD) Transmission Features Center Differential: Mechanical or Viscous coupling center differential (depending on specific WRX/STi variant) 📐 Dimensions Exterior Body Style: Sedan and Wagon (specific availability may vary by market/trim) Weights Curb Weight Wrx: Approximately 3100-3200 lbs (depending on body style) Curb Weight Sti: Approximately 3250-3350 lbs (depending on body style) Wheel Specs Bolt Pattern: 5x100mm Wheel Size Wrx: 17x7 inches (typical) Wheel Size Sti: 17x7.5 inches (typical) 🛡️ Safety Features Ratings NHTSA Front Impact: 5-Star (for 2004 model year, check specific vehicle configuration) Active Features ABS: Standard Anti-lock Braking System (ABS) Passive Features Airbags: Front airbags, side airbags (availability may vary by trim) 💡 Technology Features Infotainment Audio System: Standard AM/FM/CD player with 4 or 6 speakers. Optional premium audio system may be available. Driver Assistance Traction Control: Subaru's Symmetrical AWD system provides inherent stability; traction control systems may be present depending on trim. Connectivity Auxiliary Input: Not typically standard in 2004; aftermarket solutions often used. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 3,750 miles or 6 months, whichever comes first (refer to manual for precise details based on driving conditions) Timing Belt Replacement: Recommended at 105,000 miles or 105 months (for models with timing belts; EJ205/EJ257 use timing belts) Fluid Specifications Engine Oil Viscosity: 0W-30 or 5W-30 Synthetic (refer to manual for exact specification and temperature range) Coolant Type: Subaru Genuine Coolant (Blue) or equivalent silicate-free long-life coolant Transmission Fluid Manual: Subaru Genuine Gear Oil or equivalent GL-5 rated 75W-90 Differential Fluid Front Rear: Subaru Genuine Gear Oil or equivalent GL-5 rated 75W-90 Known Issues Headgaskets: While not as prevalent as earlier EJ engines, some instances of head gasket seepage can occur (though less common on 2nd gen than 1st). Clutch Wear: Performance driving can accelerate clutch wear. Turbocharger Maintenance: Regular oil changes and proper cool-down procedures are crucial for turbocharger longevity. Oil Capacity Engine Oil Capacity: Approximately 4.5 US quarts (with filter) for EJ205/EJ257 (verify in manual) 📚 Vehicle History Brand Heritage Subaru Performance Focus: Subaru is renowned for its symmetrical all-wheel-drive system and turbocharged Boxer engines, particularly in its performance-oriented models. Model Evolution Impreza Generations: The 2004...