🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX/STI Production Years: 2008, 2009, 2010 Generation Chassis Code: GE/GH/GR/GV (Third Generation) Codes Engine Codes: EJ257 (STI - Turbocharged Boxer), EJ255 (WRX - Turbocharged Boxer), EJ253 (Non-turbo Impreza variants, though this manual focuses on WRX/STI) 👋 Introduction Market Position Segment: Performance Compact Sedan/Hatchback Performance Value: The Impreza WRX and STI are positioned as affordable, yet highly capable, performance vehicles offering a blend of everyday usability and track-day or rally-inspired driving dynamics. Competitive Analysis Competitors: Mitsubishi Lancer Evolution, Volkswagen GTI, Mazdaspeed3, Ford Focus RS (where applicable). Key Features Highlights: Symmetrical All-Wheel Drive, turbocharged Boxer engines, rally-inspired performance, strong aftermarket support, distinctive Subaru reliability. Performance Focus: The manual is specifically tailored to the performance-oriented WRX and STI models, providing in-depth technical data relevant to their turbocharged engines and enhanced drivetrains. 📋 Manual Details Coverage Areas Covered Systems: General Information, Engine (STI, WRX Turbo, Non-Turbo variants), Transmission (Automatic, Manual 5-speed, Manual 6-speed), Chassis (Suspension, Brakes, Steering, Driveline, Wheels/Tires, ABS/VDC), Body (HVAC, Airbags, Restraints, Lighting, Wipers, Audio, Glass, Structure, Seats, Locks, Sunroof, Trim, Body Panels), Wiring, Body Repair, Mechanism and Function (covering many of the above systems in detail with a focus on function and components). Technical Training References: Includes 'Technicians Training And Reference Manuals' covering areas like Electrical Theory, Boxer Engine principles, Brake Systems, HVAC, Steering, On-Board Diagnostics II, and Supplemental Restraint Systems, indicating a high level of technical detail. Page Count Estimated Pages: Over 2000 pages (typical for comprehensive factory service manuals of this era, exact count not provided but implied by extensive section breakdown and 'COMPLETE' description). Manual Type Type: Official Service Repair Manual Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Engine Management: Fuel Injection (EFI), Emission Control (EVAP, Secondary Air Injection), Ignition System (Coil-on-Plug), Starting and Charging Systems, Speed Control (Cruise Control), Engine Diagnostics (OBD-II). Chassis Systems: Front and Rear Suspension (MacPherson struts front, double wishbone rear), Brake System (ventilated discs front, solid discs rear; 4-piston front calipers on STI), Power Steering (hydraulic), Differentials (front, rear, center), Transfer Case (on AWD models), Drive Shafts, Wheel and Tire System. Body And Interior: HVAC system, airbags, seat belts, lighting, wipers, washers, infotainment, glass, mirrors, body structure repair, interior/exterior trim, door locks, security systems, sunroof mechanisms. Powertrain Control: Engine Control Module (ECM) functions, fuel control strategies, ignition timing, electronic throttle body control, turbocharger wastegate control, Variable Valve Timing (VVT) mechanisms, and diagnostic trouble codes (DTCs). Procedures Included Repair And Maintenance: All diagnostic and repair procedures, rebuilds, refurbishments, restoration, pre-delivery inspection, periodic maintenance services, troubleshooting, component replacement, system adjustments, electrical system diagnosis. Electrical Diagnostics: Comprehensive wiring diagrams, component location charts, diagnostic procedures for all electrical systems including Engine Control Module (ECM), Transmission Control Module (TCM), Body Control Module (BCM), Airbag System, HVAC controls, lighting, infotainment, and security systems. Transmission Overhaul: Step-by-step instructions for the overhaul of both manual (5MT, 6MT) and automatic (4EAT, 5AT) transmissions, including disassembly, inspection, component replacement, assembly, and adjustment. Covers clutches and differentials. Body Repair Techniques: Procedures for body panel replacement, structural repairs, welding, dent removal, and refinishing, ensuring a comprehensive approach to vehicle restoration and repair. Technical Depth Depth: Comprehensive dealership-level technical information, including detailed illustrations, step-by-step instructions, diagnostic procedures, wiring diagrams, specifications, and recommended materials. Engine Rebuild: Detailed procedures for engine disassembly, inspection, measurement, component replacement (pistons, rods, crankshaft, cylinder heads, valves, camshafts), and reassembly for both turbo and non-turbo boxer engines. Wiring Diagrams Coverage: The 'Wiring' section and individual system sections within 'Body' and 'Chassis' contain comprehensive, often color-coded, wiring diagrams for all vehicle systems, crucial for electrical diagnostics. 📊 Manual Specifications File Format Format Details: PDF (Portable Document Format), allowing for easy viewing, searching, and printing. Searchability: PDF format allows for full-text searching, enabling quick retrieval of information on specific components or procedures. Print Quality Printability: Printable without restriction. Illustration Quality: High-quality illustrations and diagrams are typical of factory service manuals, crucial for understanding complex assembly and repair steps. Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Sti Engine: 2.5L Turbocharged EJ257 Boxer Engine Performance Sti Power Output: Approximately 305 hp @ 6000 rpm (varies slightly by year and specific market). Sti Torque Output: Approximately 290 lb-ft @ 4000 rpm (varies slightly by year and specific market). Wrx Engine: 2.5L Turbocharged EJ255 Boxer Engine Wrx Power Output: Approximately 265 hp @ 5200 rpm (varies slightly by year and specific market). Wrx Torque Output: Approximately 247 lb-ft @ 2000 rpm (varies slightly by year and specific market). Fuel System Fuel Delivery: Multi-point Fuel Injection (MPI), Electronic Throttle Control (ETC), Twin-scroll turbocharger (STI), Single-scroll turbocharger (WRX). 🔧 Transmission Standard Sti Transmission: 6-speed Manual Transmission (6MT) Optional Wrx Transmission: 5-speed Manual Transmission (5MT) or 4-speed Automatic Transmission (4EAT). Features All Wheel Drive: Symmetrical All-Wheel Drive (SAWD)...