2004 Subaru Impreza STI Workshop Factory Service Repair Manual

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🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2004 Codes Chassis Code: GDB Engine Code: EJ257 👋 Introduction Market Position Positioning: Performance compact sedan, rallying heritage, enthusiast-focused...

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Type: Car

Vendor:

Sku: 347738

Tags: 2004 Car Cars Impreza STI Misc Subaru

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Description

🏷️ Basic Information

Identification

Make:

Subaru

Model:

Impreza WRX STI

Year:

Codes

Chassis Code:

Engine Code:

EJ257

👋 Introduction

Market Position

Positioning:

Performance compact sedan, rallying heritage, enthusiast-focused vehicle

Competitive Analysis

Competitors:

Mitsubishi Lancer Evolution, Honda Civic Type R, Volkswagen Golf GTI

Key Features

Performance Features:

Symmetrical All-Wheel Drive, turbocharged Boxer engine, performance-tuned suspension

Rally Heritage:

Direct lineage from WRC-winning vehicles

📋 Manual Details

Coverage Areas

Coverage:

Complete vehicle coverage for the 2004 Subaru Impreza WRX STI

Page Count

Page Count:

Estimated 2000+ pages (typical for full workshop manuals)

Manual Type

Type:

Factory Service Manual / Workshop Manual / Repair Manual

Language

Language:

English

Format

Format:

Digital Download (PDF)

📖 Manual Coverage

Systems Covered

Powertrain:

Engine (EJ257), transmission (6-speed manual), drivetrain (AWD system), exhaust system

Chassis:

Suspension (front/rear), steering system, braking system (ABS), wheels and tires

Electrical:

Wiring diagrams, engine control module (ECM), body control module (BCM), lighting, audio system, power accessories

Body And Interior:

Body panels, interior trim, seats, HVAC system, safety restraints (airbags)

Procedures Included

Maintenance:

Scheduled maintenance, fluid changes, filter replacements, belt inspections

Repair:

Engine overhauls, transmission rebuilds, suspension component replacement, brake system repairs, electrical component diagnosis and replacement

Diagnostics:

Troubleshooting guides, diagnostic trouble codes (DTCs) interpretation, symptom-based diagnostics

Specifications:

Torque specifications, clearances, alignment data, electrical resistance values

Technical Depth

Depth:

Comprehensive factory-level detail, suitable for professional technicians and experienced DIY enthusiasts

📊 Manual Specifications

File Format

PDF Quality:

High-resolution, searchable text, printable pages

Searchability:

Fully searchable text for quick information retrieval

Print Quality

Print Recommendation:

Optimized for printing individual sections or the entire manual

Binding Type

Binding Type:

N/A (Digital Download)

Paper Type

Paper Type:

N/A (Digital Download)

⚙️ Engine Specifications

Primary Engine

Engine Type:

Horizontally-opposed (Boxer), turbocharged, intercooled, DOHC, 16-valve

Displacement:

2457 cc (2.5 Liters)

Performance

Horsepower:

300 hp @ 6000 rpm

Torque:

300 lb-ft @ 4000 rpm

Fuel System

Fuel Delivery:

Multi-point fuel injection (MPI), electronic throttle control

Recommended Fuel:

Premium Unleaded (91 octane or higher)

Engine Management

ECU Type:

Denso ECU

🔧 Transmission

Standard

Transmission Type:

6-speed manual transmission

Optional

Optional Transmissions:

None for STI model

Features

AWD System:

Subaru Symmetrical All-Wheel Drive with Driver Controlled Center Differential (DCCD)

Differential Types:

Helical limited-slip front differential, viscous coupling limited-slip center differential, Helical limited-slip rear differential

📐 Dimensions

Exterior

Length:

173.8 inches

Width:

69.7 inches

Height:

57.7 inches

Wheelbase:

100.5 inches

Ground Clearance:

5.1 inches

Weights

Curb Weight:

3263 lbs

🛡️ Safety Features

Ratings

NHTSA Front Impact:

5-star driver, 5-star passenger

IIHS Side Impact:

Acceptable

Active Features

Braking System:

4-wheel disc brakes with ABS (Anti-lock Braking System), Front: 12.7-inch vented rotors with 4-piston Brembo calipers, Rear: 11.3-inch vented rotors with 2-piston Brembo calipers

Traction Control:

Standard (integrated with AWD and DCCD)

Passive Features

Airbags:

Driver and front passenger airbags, front side-impact airbags

Seatbelts:

3-point height-adjustable front seatbelts with pretensioners, LATCH child seat anchors

💡 Technology Features

Infotainment

Head Unit:

Standard AM/FM/CD player with optional premium audio system

Display:

Basic LCD display for audio and clock functions

Driver Assistance

Standard Anti-lock Braking System

AWD Control:

Driver Controlled Center Differential (DCCD) for adjustable torque split

Connectivity

Auxiliary Input:

Optional auxiliary audio input jack

🔧 Maintenance

Service Intervals

Oil Change Interval:

Every 3,750 miles or 3 months

Air Filter Replacement:

Every 15,000 miles or 12 months

Spark Plug Replacement:

Iridium: 60,000 miles

Timing Belt Replacement:

N/A (EJ257 uses a timing chain)

Fluid Specifications

Engine Oil Type:

SAE 5W-30 Synthetic

Engine Oil Capacity:

4.8 US quarts (4.5 liters) with filter

Transmission Fluid Type:

GL-4/GL-5 SAE 75W-90 Synthetic

Differential Fluid Type:

GL-5 SAE 75W-90 Synthetic (Front & Rear)

Coolant Type:

Subaru Super Coolant (Blue) or equivalent HOAT

Known Issues

Head Gasket Failure:

Less common on EJ257 compared to earlier EJ25, but still a potential concern; proper maintenance is crucial.

Piston Ringland Failure:

Can occur with aggressive tuning or detonation; careful fuel selection and monitoring are important.

Clutch Wear:

High-performance nature can lead to faster clutch wear under spirited driving conditions.

📚 Vehicle History

Brand Heritage

Subaru Rally History:

Long and successful history in World Rally Championship (WRC) with Impreza models

Model Evolution

Third Generation Gdb:

Introduction of the wider body, improved chassis rigidity, and updated powertrain for the GDB generation (2002-2007)

Production

Production Years:

2002-2007 (GDB generation)

Manufacturing Location:

Japan

🏆 Awards & Recognition

Recognitions

Performance Awards:

Consistently lauded by automotive press for its rally-bred performance and handling capabilities.