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Subaru

2004 Subaru Impreza WRX STi Workshop Service Repair Manual

2004 Subaru Impreza WRX STi Workshop Service Repair Manual

$17.99
$17.99
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Vehicle data plateRef 290898
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
đŸ·ïž Basic Information
Identification
Make:
Subaru
Model:
Impreza WRX STi
Year:
2004
Chassis Code:
GDB (Wide Body)
Market Segment:
Compact Sport Sedan / Hatchback
👋 Introduction
Market Position
Historical Context:
The 2004 Impreza WRX STi (GDB chassis) represents a significant evolution of Subaru's rally-bred performance icon, building on the legacy of the GC8 chassis. This model introduced the wider body, improved suspension, and a more potent engine, solidifying its reputation as a highly capable all-wheel-drive performance car.
Competitive Analysis
Competitors:
Competed against performance variants of cars like the Mitsubishi Lancer Evolution, Ford Focus RS, Volkswagen Golf R32, and various European hot hatches.
Key Features
Performance Differentiation:
Renowned for its Symmetrical All-Wheel Drive system, turbocharged Boxer engine, and robust chassis, offering exceptional grip and handling in diverse conditions.
Value Proposition
Manual Benefit:
This manual empowers owners and enthusiasts to perform intricate maintenance and repairs, significantly reducing reliance on dealership services and preserving the vehicle's performance potential.
📋 Manual Details
Coverage Areas
Manual Type:
Workshop Service Repair Manual
Language:
English
Format:
Digital (likely PDF)
Completeness:
100% Complete, no missing/corrupt pages
Delivery Method:
Instant Download
📖 Manual Coverage
Systems Covered
Engine:
Complete overhaul, rebuilding, performance tuning, diagnostics, troubleshooting
Engine Management:
Engine control unit (ECU), sensors, actuators, fuel injection, ignition system
Transmission:
Manual transmission (TY757VW1AA), removal, installation, in-car servicing, lubrication
Drivetrain:
All-Wheel Drive (AWD) system, differentials (front, center, rear), U-Joints, CV-Joints
Brakes:
Hydraulic system, anti-lock braking system (ABS), brake pad/rotor replacement, caliper servicing, bleeding procedures
Suspension:
Front and rear suspension components, shock absorbers, springs, bushings, alignment procedures and specifications
Steering:
Power steering system, steering rack, tie rods, alignment specifications
Electrical System:
Complete wiring diagrams, battery, charging system, starting system, lighting, accessories, fuses, relays
Climate Control:
Air conditioning (AC) system, refrigerant capacities, compressor, condenser, evaporator servicing
Body And Trim:
Interior and exterior trim removal/installation, sunroof operation and servicing
Procedures Included
Maintenance:
Factory maintenance schedules and charts, fluid changes (oil, coolant, brake, transmission, differential), filter replacements (oil, air, fuel, cabin)
Repair:
Step-by-step instructions for all major component repairs and replacements
Troubleshooting:
Diagnostic trouble codes (DTCs), computer diagnostic trouble tree charts, troubleshooting guides for common driving concerns
Diagnostics:
Detailed diagnostic procedures for engine performance, emissions, and other systems
Timing Belt:
Timing belt replacement procedures, tensioner adjustment, serpentine belt routings with diagrams
Alignment:
Front end and alignment procedures and specifications
Wiring:
Complete wiring diagrams for all vehicle systems
Torque Specifications:
Complete torque specifications for all fasteners
Technical Depth
Depth:
Comprehensive, from basic maintenance to complete engine and transmission rebuilds
Detail Level:
Highly detailed with step-by-step instructions, diagrams, and illustrations
Target Audience:
Professional technicians, mechanics, and DIY enthusiasts
📊 Manual Specifications
File Format
File Format:
Likely PDF (searchable text and high-resolution images)
Print Quality
Image Quality:
High-resolution illustrations and pictures
Text Clarity:
Clear and easy-to-read text
Binding Type
Binding:
Not applicable for digital format, but implies a complete, organized document
Paper Type
Paper Type:
Not applicable for digital format
⚙ Engine Specifications
Primary Engine
Engine Code:
EJ257
Engine Type:
2.5L DOHC 16-valve turbocharged flat-four (Boxer)
Performance
Horsepower:
300 PS (296 hp) at 6000 rpm (JDM/Euro spec), 300 hp at 6000 rpm (USDM spec)
Torque:
350 Nm (258 lb-ft) at 4000 rpm (JDM/Euro spec), 300 lb-ft at 4000 rpm (USDM spec)
Fuel System
Fuel Delivery:
Sequential multi-port fuel injection (MPI)
Turbocharger:
IHI VF39 (USDM) or VF37 (JDM), twin-scroll
Engine Management
ECU:
ECU controlled ignition timing and fuel injection
Timing
Timing Belt Type:
Timing Belt driven camshafts
🔧 Transmission
Standard
Type:
6-speed Manual Transmission (TY757VW1AA)
Optional
Type:
Not available for the WRX STi model
Features
All Wheel Drive:
Symmetrical All-Wheel Drive with Driver Controlled Center Differential (DCCD)
Clutch:
Hydraulically actuated, single-plate, dry-type clutch
📐 Dimensions
Exterior
Length:
Approximately 4,415 mm (173.8 in)
Width:
Approximately 1,770 mm (69.7 in)
Height:
Approximately 1,400 mm (55.1 in)
Wheelbase:
Approximately 2,510 mm (98.8 in)
Weights
Curb Weight:
Approximately 1,460 kg (3,219 lbs)
Gross Vehicle Weight Rating:
Varies by market, consult specific vehicle documentation
đŸ›Ąïž Safety Features
Ratings
NHTSA Front Impact:
4-star driver, 4-star passenger (as per NHTSA 2004 data)
IIHS Side Impact:
Acceptable (as per IIHS 2004 data)
Active Features
ABS:
Standard Anti-lock Braking System (ABS)
AWD:
Symmetrical All-Wheel Drive with DCCD
Passive Features
Airbags:
Driver and front passenger airbags, side airbags (market dependent)
Seatbelts:
3-point height-adjustable front seatbelts with pretensioners and load limiters
Rollover Protection:
Reinforced chassis structure
💡 Technology Features
Infotainment
Audio System:
Factory radio with CD player, AM/FM tuner, and speakers. Aftermarket head unit upgrades are common.
Instrumentation:
Performance-oriented instrument cluster with boost gauge, tachometer, speedometer, and auxiliary gauges.
Driver Assistance
Traction Control:
Standard stability and traction control systems (VDC - Vehicle Dynamics Control) that work in conjunction with the AWD system.
Connectivity
Standard Features:
Limited by 2004 standards, typically no factory Bluetooth or advanced connectivity features. Aux input for audio devices may be present on some models.
🔧 Maintenance
Service Intervals
Oil Change:
Every 3,750 miles or 6 months, or every 7,500 miles/12 months with synthetic oil (consult manual for specific recommendation)
Timing Belt:
Recommended replacement every 90,000-105,000 miles or 7-8 years (critical component)
Spark Plugs:
Replace at 30,000-60,000 miles depending on type (iridium recommended)
Fluid Specifications
Engine Oil:
SAE 5W-30 or 10W-30, API SG/SH/SJ/SL or ACEA A1/A2/A3 (Synthetic recommended for performance driving)
Coolant:
Subaru Super Coolant (Blue) or equivalent ethylene glycol-based coolant with corrosion inhibitors (50/50 mix with distilled water)
Transmission Fluid:
API GL-5, SAE 75W-90 (Subaru Extra-S or equivalent)
Differential Fluid:
API GL-5, SAE 75W-90 (Rear differential), API GL-5, SAE 75W-90 (Front differential)
Known Issues
Head Gaskets:
While less common on the EJ257 compared to earlier EJ25s, monitoring for coolant leaks and oil in coolant is still prudent.
Ring Land Failure:
Can occur on aggressively tuned engines or those consistently subjected to high loads without proper maintenance. Proper fueling and tuning are critical.
Clutch Wear:
Performance driving can accelerate clutch wear.
Turbo Failure:
Regular oil changes and allowing the turbo to cool down after spirited driving can prolong its life.
📚 Vehicle History
Brand Heritage
Rally Legacy:
Subaru's deep roots in the World Rally Championship (WRC) heavily influenced the Impreza WRX STi's development, imbuing it with performance engineering and a distinctive identity.
Model Evolution
Gdb Generation:
The 2004 model is part of the second generation (GDB) Impreza, a significant redesign from the previous GC8 generation, featuring a wider track and bodywork for improved stability and handling.
Production
Manufacturing Location:
Japan
Key Variants:
Available in Sedan and Hatchback (Sport Wagon) body styles, with JDM, Euro, and USDM specifications differing slightly in engine tuning and features.
🏆 Awards & Recognition
Recognitions
Car And Driver 10Best:
The Impreza WRX was a frequent contender on Car and Driver's 10Best lists in its era, recognizing its exceptional performance value.
Rally Car Of The Year:
The Impreza platform consistently earned accolades in rally racing worldwide, bolstering its performance image.

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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