SUBARU IMPREZA STI (GASOLINE) 2004 Full Service Repair MANUAL

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🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2004 Engine Type: Gasoline Codes Chassis Code: GDB Engine Code: EJ207 👋 Introduction Market Position Segment: Performance Compact Sedan/Wagon...

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Mots clés: 2004 Car Cars IMPREZA STI Misc Subaru

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Description

🏷️ Basic Information

Identification

Make:

Subaru

Model:

Impreza WRX STI

Year:

Engine Type:

Gasoline

Codes

Chassis Code:

Engine Code:

EJ207

👋 Introduction

Market Position

Segment:

Performance Compact Sedan/Wagon

Niche:

Rally-bred performance, all-wheel-drive capability

Competitive Analysis

Key Competitors:

Mitsubishi Lancer Evolution, Ford Focus RS (later models), Volkswagen Golf GTI

Key Features

Drivetrain:

Symmetrical All-Wheel Drive (AWD)

Engine:

EJ207 turbocharged Boxer engine

Transmission:

6-speed manual transmission

Suspension:

Performance-tuned suspension with DCCD (Driver Controlled Center Differential)

Brakes:

Brembo performance brake system

Aero:

Aggressive aerodynamic enhancements including rear wing

📋 Manual Details

Coverage Areas

Primary Coverage:

Comprehensive Service and Repair

Secondary Coverage:

Maintenance, Troubleshooting, Diagnostics

Page Count

Estimated Pages:

1000+

Manual Type

Type:

Factory Service Manual (FSM)

Language

Language:

English

Format

Format:

Digital (PDF)

📖 Manual Coverage

Systems Covered

Engine Mechanical:

Complete overhaul, timing belt, pistons, crankshaft, cylinder heads, valve train

Engine Performance:

Turbocharger system, fuel injection, ignition system, ECU diagnostics, emissions controls

Transmission Drivetrain:

Manual transmission (6-speed), clutch, drivetrain components, differentials (front, rear, center DCCD)

Suspension Steering:

MacPherson struts, multi-link rear, springs, dampers, steering rack, power steering system

Brakes:

Front Brembo 4-piston calipers, rear 2-piston calipers, ABS, EBD, brake fluid specifications

Electrical:

Wiring diagrams, fuse box layouts, starter, alternator, battery, lighting, power windows, central locking

Bodywork Chassis:

Body panel removal/installation, chassis structure, door mechanisms, exterior trim, interior trim

HVAC:

Air conditioning system, heater core, climate control

Fuel System:

Fuel tank, fuel pump, fuel injectors, fuel pressure regulator

Procedures Included

Scheduled Maintenance:

Oil changes, filter replacements, fluid checks, spark plug replacement, timing belt replacement intervals

Troubleshooting Diagnostics:

Fault code interpretation (OBD-II), diagnostic procedures for common issues, wiring harness testing

Repair Rebuild:

Engine rebuild procedures, transmission overhaul, suspension component replacement, brake caliper overhaul

Component Replacement:

Turbocharger replacement, clutch replacement, clutch slave cylinder replacement, fuel pump replacement

Wheel Alignment:

Specifications and procedures for wheel alignment

Airbag System:

Information on airbag system safety and component replacement

Technical Depth

Depth:

Factory-level diagnostic and repair procedures

Diagnostics:

Detailed troubleshooting trees and symptom-based diagnostics

Specifications:

Torque values, clearances, tolerances, fluid capacities

Diagrams:

Exploded views, wiring diagrams, system schematics

📊 Manual Specifications

File Format

File Type:

Searchability:

Text-searchable

Print Quality

Quality:

High-resolution, printable pages

Binding Type

Binding:

N/A (Digital)

Paper Type

Paper:

N/A (Digital)

⚙️ Engine Specifications

Primary Engine

Engine Name:

EJ207

Configuration:

2.0L Boxer-4 (H4)

Aspiration:

Twin-Scroll Turbocharged

Bore X Stroke:

92.0 mm x 75.0 mm

Compression Ratio:

8.0:1

Valvetrain:

DOHC, 16 valves

Performance

Horsepower:

268 hp @ 6000 rpm (JDM spec)

Torque:

258 lb-ft @ 4000 rpm (JDM spec)

Fuel System

Fuel Delivery:

Sequential Electronic Fuel Injection (SEFI)

Fuel Type:

Unleaded gasoline (premium recommended)

Ignition System:

Electronic ignition with knock sensor

Cooling System

Type:

Liquid-cooled

Capacity:

Approx. 6.0 Liters

Lubrication System

Type:

Forced lubrication, wet sump

Oil Capacity:

Approx. 4.5 Liters (w/ filter)

Engine Mounts

Type:

Hydraulic engine mounts

🔧 Transmission

Standard

Type:

6-speed Manual

Gear Ratios:

1st: 3.636, 2nd: 2.053, 3rd: 1.545, 4th: 1.137, 5th: 0.942, 6th: 0.777, Reverse: 3.545

Final Drive Ratio:

3.545

Optional

Type:

N/A (STI was exclusively manual)

Features

Dccd:

Driver Controlled Center Differential (DCCD) with auto/manual modes

Fluid Specifications

Manual Transmission Fluid:

Subaru Extra-S Gear Oil API GL-5 75W-90 or equivalent

Clutch

Type:

Hydraulically operated, single dry plate clutch

📐 Dimensions

Exterior

Length:

4415 mm (173.8 in)

Width:

1770 mm (69.7 in)

Height:

1440 mm (56.7 in)

Wheelbase:

2625 mm (103.3 in)

Track Width Front:

1530 mm (60.2 in)

Track Width Rear:

1535 mm (60.4 in)

Ground Clearance:

135 mm (5.3 in)

Weights

Curb Weight:

Approx. 1440 kg (3175 lbs)

Wheels Tires

Wheel Size:

17 x 7.5 inches

Bolt Pattern:

5 x 114.3 mm (5x4.5 inch)

Tire Size:

225/45R17

🛡️ Safety Features

Ratings

NHTSA Front Impact:

4/5 Stars (Driver/Passenger - US models)

NHTSA Side Impact:

4/4 Stars (Front/Rear - US models)

IIHS Frontal Offset:

Active Features

Standard Anti-lock Braking System

Standard Electronic Brake-force Distribution

Standard Symmetrical All-Wheel Drive with DCCD

Passive Features

Airbags:

Driver and front passenger airbags

Seatbelts:

Three-point seatbelts with pretensioners

Chassis:

Reinforced chassis structure

💡 Technology Features

Infotainment

Head Unit:

Factory-installed AM/FM/CD player (typically basic)

Speakers:

Standard speaker configuration (4-6 speakers)

Driver Assistance

Stability Control:

Traction Control System (TCS)

Cruise Control:

Standard Cruise Control

Connectivity

Auxiliary Input:

Rarely standard, often requires aftermarket modification

Instrumentation

Gauges:

Tachometer, speedometer, fuel gauge, coolant temperature, boost gauge (integrated)

Climate Control

Type:

Manual climate control with A/C

🔧 Maintenance

Service Intervals

Engine Oil Change:

Every 3,000-5,000 miles or 6 months, depending on driving conditions (severe service requires more frequent changes)

Engine Oil Filter Replacement:

With every oil change

Air Filter Replacement:

Every 15,000-30,000 miles

Cabin Air Filter Replacement:

Every 15,000-30,000 miles

Spark Plug Replacement:

Every 60,000 miles (iridium type)

Timing Belt Replacement:

Every 90,000-105,000 miles or 7 years (critical replacement)

Coolant Flush:

Every 30,000 miles or 2 years

Fluid Specifications

Engine Oil Type:

Synthetic 5W-30 or 5W-40 (check manual for specific recommendations)

Brake Fluid Type:

DOT 3 or DOT 4

Power Steering Fluid Type:

Subaru Genuine Power Steering Fluid or Dexron II/III compatible fluid

Clutch Fluid Type:

DOT 3

Coolant Type:

Subaru Super Coolant (Blue) or equivalent silicate-free ethylene glycol based coolant

Known Issues

Engine:

Ring land failure (particularly on modified engines), head gasket leaks, turbocharger wear

Drivetrain:

Clutch wear, synchro issues in manual transmission (less common but possible), DCCD unit failure

Suspension:

Worn bushings, premature strut failure

Electrical:

Faulty window regulators, SRS system warning lights

📚 Vehicle History

Brand Heritage

Brand:

Subaru, known for its Boxer engines and All-Wheel Drive systems

Motorsport:

Strong rally racing heritage, directly influencing the STI models

Model Evolution

Generation:

Second Generation Subaru Impreza (GD/GG chassis)

Sti Introduction:

STI variant introduced to homologate for WRC and offer enhanced performance

Sub Models 2004:

STI, WRX

Facelift:

This 2004 model year often refers to the pre-facelift 'Bugeye' or early 'Blobeye' versions depending on market

Production

Production Years:

2000-2007 (GD/GG chassis)

Manufacturing Location:

Japan

🏆 Awards & Recognition

Recognitions

Motorsport Titles:

Multiple World Rally Championship (WRC) manufacturer and driver titles for Subaru

Performance Awards:

Frequently recognized by automotive journalists for its handling, performance, and rally-inspired driving dynamics

Ratings

Car And Driver 10Best:

Impreza WRX (non-STI) models often made this list, indicating the platform's merit