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Subaru

2004 Subaru Impreza WRX STi Service Repair Manual 04

2004 Subaru Impreza WRX STi Service Repair Manual 04

$17.99
$17.99
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Vehicle data plateRef 258579
Brand
Subaru
Vehicle
Home and Garden
Models covered
Guns Firearms Weapons, Impreza WRX STi, Sporting Goods, Sti
Years
2004
Format
PDF, searchable, print-ready
Delivery
Instant download after checkout
Language
English

What happens after you pay

  • Download link opens on the order page immediately
  • The same link is emailed to you — re-download any time
  • Open on phone, tablet or PC; print only the pages you need
  • Not sure it covers your model year? Ask us before you buy
🏷️ Basic Information
Identification
Make:
Subaru
Model:
Impreza WRX STi
Year:
2004
Codes
Chassis Code:
GDB
👋 Introduction
Market Position
Positioning:
High-performance compact sedan and wagon, renowned for its rally heritage and all-wheel-drive system.
Competitive Analysis
Competitors:
Mitsubishi Lancer Evolution, Ford Focus RS, Volkswagen Golf GTI/R32
Key Features
Performance Focus:
Emphasis on turbocharged engine performance, Symmetrical All-Wheel Drive, and track-ready handling.
Target Audience
Audience:
Enthusiast owners, DIY mechanics, and performance tuning shops.
📋 Manual Details
Coverage Areas
Primary Coverage:
Complete Service and Repair for 2004 Subaru Impreza WRX STi
Secondary Coverage:
Routine Maintenance, Tune-up Procedures, Specifications
Page Count
Estimated Page Count:
Detailed page count not provided, but described as 'most complete ever compiled'.
Manual Type
Type:
Service Repair Manual
Language
Language:
English
Format
File Format:
PDF
Delivery Method:
INSTANT DOWNLOAD
📖 Manual Coverage
Systems Covered
Engine:
Engine Removal/Installation, Cylinder Head/Valve Train, Engine Block, Engine Lubrication, Engine Repair, Valve Timing Procedures, Chain & Gear Replacement, Tensioner Adjustments, Tightening Torques, Timing Marks, Valve Timing Instructions, Tensioner Release & Reset Methods, Chain Routing & Sprocket/Gear Valve Timing Marks
Drivetrain:
Transaxle, Clutch, Manual Transmission, Automatic Transmission (if applicable to WRX STi model), Differential, Driveshaft
Chassis:
Steering, Suspension, Brakes (including ABS), Body
Electrical:
Electrical System, Wiring Diagrams, SRS (Supplemental Restraint System)
HVAC:
Cooling and Heating, Heater and Air Conditioning, Automatic Climate Control
Fuel Emissions:
Intake Manifold/Exhaust System, Fuel and Emissions, Exhaust, Emissions Control, Ignition
Engine Management System:
Fuel injection, ignition timing, sensor operations, and ECU logic.
Procedures Included
Maintenance:
Routine Maintenance, Tune-up Procedures
Repair:
Engine Repair, Transmission Repair, Brake Repair, Suspension Repair, Electrical Diagnosis and Repair, Body Panel Repair
Diagnostics:
Troubleshooting guides are implied for all covered systems.
Installation:
General Removal & Installation Instructions
Special Procedures:
Valve Timing Procedures, Chain & Gear Replacement, Tensioner Adjustments, Tightening Torques, Valve Timing Instructions, Tensioner Release & Reset Methods, Chain Routing & Sprocket/Gear Valve Timing Marks
Troubleshooting:
Systematic troubleshooting guides for common and uncommon faults across all major vehicle systems.
Technical Depth
Depth:
Comprehensive from basic maintenance to advanced engine and drivetrain overhaul, including detailed diagnostics and electrical schematics.
Diagnostic Tools:
Covers procedures for using OBD-II scanners and specific Subaru diagnostic tools for fault code retrieval and live data analysis.
Rebuild Procedures:
Detailed steps for engine and transmission disassembly, inspection, repair, and reassembly.
📊 Manual Specifications
File Format
Compatibility:
All Versions of Windows & Mac
Requirements:
Adobe PDF Reader & WinZip
File Type:
PDF (Portable Document Format)
Print Quality
Printability:
All pages are printable
Binding Type
Binding:
Digital Download (No physical binding)
Paper Type
Paper Quality:
N/A (Digital format)
⚙️ Engine Specifications
Primary Engine
Engine Code:
EJ257
Engine Type:
2.5L Turbocharged Horizontally Opposed (Boxer) 4-Cylinder
Performance
Horsepower:
265 HP @ 6000 RPM (approx.)
Torque:
247 lb-ft @ 4000 RPM (approx.)
Fuel System
Fuel Delivery:
Sequential multi-port fuel injection, Turbocharged with intercooler
Engine Management
ECU Type:
Specific ECU details covered in manual for diagnosis and tuning.
🔧 Transmission
Standard
Transmission Type:
6-Speed Manual Transmission
Optional
Optional Transmission:
Not typically offered on WRX STi models; focus is on the performance manual.
Features
AWD System:
Subaru Symmetrical All-Wheel Drive with Driver Controlled Center Differential (DCCD)
📐 Dimensions
Exterior
Body Styles:
Sedan, Wagon
Weights
Curb Weight Sedan:
Approx. 3280 lbs (1488 kg)
Curb Weight Wagon:
Approx. 3350 lbs (1519 kg)
🛡️ Safety Features
Ratings
NHTSA Front Driver:
5-Star (for 2004 model year sedan)
NHTSA Front Passenger:
5-Star (for 2004 model year sedan)
Active Features
Active Safety:
ABS (Anti-lock Braking System), AWD (All-Wheel Drive)
Passive Features
Passive Safety:
Front airbags, Side airbags (optional/standard depending on trim), 3-point seatbelts
💡 Technology Features
Infotainment
Infotainment System:
Basic AM/FM/CD audio system with optional premium sound. No integrated navigation or advanced connectivity typically found in modern vehicles.
Driver Assistance
Driver Assistance:
Primarily focused on mechanical systems like AWD and ABS, not electronic driver aids.
Connectivity
Connectivity Features:
Limited to standard audio inputs (e.g., AUX jack on some models/aftermarket units).
🔧 Maintenance
Service Intervals
Oil Change Interval:
Typically every 3,750 miles or 6 months (severe duty) / 7,500 miles or 12 months (normal duty), refer to manual for specifics.
Timing Belt Interval:
105,000 miles or 105 months (for EJ257 engines, verify with manual for exact interval).
Fluid Specifications
Engine Oil:
SAE 5W-30 (check manual for specific Subaru or API/ILSAC ratings)
Transmission Fluid:
GL-5 75W-90 Synthetic (for manual transmission, check manual for specific Subaru fluid or equivalency)
Differential Fluid:
GL-5 75W-90 Synthetic (front and rear, check manual)
Coolant:
Subaru Genuine Coolant (Blue) or equivalent P-HOAT coolant
Known Issues
Engine Wear:
Piston ring land failures, ring land cracking (especially with aggressive tuning), head gasket leaks (though less common on EJ257 than earlier EJ25 variants).
Turbocharger:
Potential for turbo seal failure or bearing wear leading to oil consumption and smoke.
Clutch:
Wear and tear is common given the performance-oriented nature of the vehicle.
📚 Vehicle History
Brand Heritage
Heritage:
Subaru's long-standing success in rallying (WRC) heavily influenced the Impreza WRX STi lineage.
Model Evolution
Generation:
Second Generation (GD chassis), specifically the 'Blobeye' refresh for 2004.
Production
Production Years Gdb:
2000-2007 (GD chassis), with the '04 representing a specific facelift.
🏆 Awards & Recognition
Recognitions
Rally Heritage:
Direct descendant of World Rally Championship winning vehicles.
Ratings
Performance Ratings:
Consistently praised by automotive journalists for its handling, grip, and performance-per-dollar.

Delivery & file format

This is a digital PDF download, not a printed book. After payment the download link appears on your order confirmation page and is emailed to the address you entered. Files open in any PDF reader on phone, tablet or computer and can be printed.

Check the model year and engine before you buy

Manufacturers change procedures, wiring and part numbers between model years and engine options. If your VIN plate shows a year or engine code that is not listed on the data plate above, contact us with the model, year and VIN and we will confirm coverage before you order.

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