Subaru Impreza STi (gasoline) 2004 Service Repair Manual

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

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Art.-Nr: 427680

Stichworte: 2004 Car Cars Impreza STi Misc Subaru

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Beschreibung

🏷️ Basic Information

Identification

Make:

Subaru

Model:

Impreza STi

Year:

Engine Type:

Gasoline

Codes

Chassis Code:

Engine Code Primary:

EJ207

👋 Introduction

Market Position

Segment:

Performance Compact Sedan/Hatchback

All-Wheel Drive (AWD) performance, rally-bred heritage, turbocharged power

Competitive Analysis

Key Competitors:

Mitsubishi Lancer Evolution, Subaru WRX (non-STi variants), Volkswagen Golf GTI, Ford Focus RS

Key Features

Performance Orientation:

Designed for enthusiast drivers seeking track-capable performance

AWD System:

Subaru's legendary symmetrical All-Wheel Drive with Driver Controlled Center Differential (DCCD)

Engine Technology:

High-revving, turbocharged Boxer engine

Chassis Dynamics:

Performance-tuned suspension and chassis for superior handling

📋 Manual Details

Coverage Areas

Primary Coverage:

Complete Factory Service Repair

Additional Coverage:

Do-it-yourself (DIY) focus, comprehensive diagrams

Page Count

Estimated Page Count:

Over 1500 pages (typical for comprehensive factory manuals)

Manual Type

Type:

Service Manual / Repair Manual

Language

Language:

English

Format

Format:

Digital (PDF expected, though physical may exist)

📖 Manual Coverage

Systems Covered

Engine:

Full engine overhaul, diagnostics, performance tuning, lubrication, cooling, fuel injection, ignition, exhaust

Transmission:

Manual transmission (Type RA/STi specific), clutch system, drivetrain, differentials (front, center, rear)

Brakes:

ABS system, hydraulic components, brake pads, rotors, calipers, parking brake

Suspension:

Front and rear suspension components, shock absorbers, springs, control arms, anti-roll bars, alignment procedures

Steering:

Power steering system, steering rack, column, troubleshooting

Electrical:

Wiring diagrams, lighting, starter, alternator, battery, fuses, relays, ECU, sensor diagnostics

Body And Chassis:

Body panel removal/installation, interior trim, chassis components, rust prevention, collision repair basics

HVAC:

Air conditioning system, heating, ventilation, climate control diagnostics

Restraints:

Airbag system, seatbelt operation and maintenance

Procedures Included

Maintenance:

Oil changes, filter replacements, fluid flushes, spark plug replacement, timing belt inspection/replacement

Troubleshooting:

Diagnostic flowcharts for common problems, fault codes and their meanings

Repair:

Component replacement, system diagnostics, calibration procedures

Diagnostics:

On-board diagnostics (OBD-II), sensor testing, actuator testing, circuit testing

Specifications:

Torque specifications for all fasteners, tolerances, clearances

Technical Depth

Depth:

Comprehensive, covering basic maintenance to complete engine and transmission rebuilds

Diagrams Quality:

Top quality, detailed illustrations and exploded views

Text Readability:

Easy-to-read text sections

📊 Manual Specifications

File Format

Digital Format:

PDF (searchable text, printable pages)

Print Quality

Print Quality:

High resolution for clear diagrams and text

Binding Type

Binding Type:

N/A (if digital), Professional perfect binding (if printed)

Paper Type

Paper Type:

N/A (if digital), High-quality, durable paper (if printed)

⚙️ Engine Specifications

Primary Engine

Engine Family:

EJ Series Boxer

Engine Code:

EJ207

Displacement:

2.0 Liters (1994 cc)

Configuration:

Horizontally opposed (Boxer), 4-cylinder

Aspiration:

Turbocharged, Intercooled

Valvetrain:

DOHC, 16 valves (4 valves per cylinder)

Bore X Stroke:

92.0 mm x 75.0 mm

Compression Ratio:

8.0:1

Performance

Horsepower Ps:

280 PS @ 6400 rpm (JDM Spec)

Horsepower Hp:

Approx. 276 hp @ 6400 rpm (JDM Spec)

Torque Lb-Ft:

250 lb-ft @ 4400 rpm (JDM Spec)

Redline:

7500 rpm

Fuel System

Fuel Delivery:

Multi-point Fuel Injection (MPI)

Fuel Type:

Unleaded Premium (91 Octane minimum recommended)

Ignition System:

Electronic Ignition with Coil-on-Plug

Turbocharger Model:

IHI VF34 (or similar spec)

🔧 Transmission

Standard

Type:

6-speed Manual Transmission

Gear Ratios Approx:

1st: 3.636, 2nd: 2.375, 3rd: 1.760, 4th: 1.345, 5th: 1.062, 6th: 0.850

Features

Dccd:

Driver Controlled Center Differential (manual and auto modes)

Differential Type Front:

Helical Limited-Slip Differential (LSD)

Differential Type Rear:

Viscous Limited-Slip Differential (LSD)

Fluid Specifications

Manual Transmission Fluid Spec:

Subaru Extra-PS Fluid (or equivalent GL-5 75W-90 API)

📐 Dimensions

Exterior

Length:

4405 mm (173.4 in)

Width:

1770 mm (69.7 in)

Height:

1440 mm (56.7 in)

Wheelbase:

2625 mm (103.3 in)

Front Track:

1530 mm (60.2 in)

Rear Track:

1525 mm (60.0 in)

Weights

Curb Weight Kg:

Approx. 1470 kg (3240 lbs)

Gross Vehicle Weight Rating Kg:

Approx. 1870 kg (4120 lbs)

Wheel Bolt Pattern:

5 x 100 mm

Wheel Size Standard:

17 x 7.5 inches

Tire Size Standard:

225/45R17

🛡️ Safety Features

Ratings

NHTSA Front Impact Driver:

Good (for comparable models of the era)

NHTSA Front Impact Passenger:

Good (for comparable models of the era)

IIHS Front Small Overlap:

N/A (Test not standardized or performed during this era)

Active Features

Standard

Traction Control:

Yes (VDC - Vehicle Dynamics Control, often optional or specific trims)

Electronic Brakeforce Distribution:

Yes (part of ABS system)

Passive Features

Airbags Front:

Driver and Passenger Airbags

Airbags Side:

Optional Side Airbags (check specific trim/market)

Seatbelts:

3-point front and rear seatbelts, pretensioners

Child Seat Anchors:

LATCH/ISOFIX (rear seats)

💡 Technology Features

Infotainment

Head Unit:

Factory AM/FM/CD player (typically basic, often upgraded by owners)

Audio System:

Standard speaker setup (upgrades common)

Driver Assistance

Cruise Control:

Standard

Stability Control:

Vehicle Dynamics Control (VDC) available on some trims

Connectivity

Auxiliary Input:

Rarely standard; often added via aftermarket modifications.

Bluetooth:

Not standard; aftermarket solutions required.

🔧 Maintenance

Service Intervals

Oil Change Interval:

Every 3,000-5,000 miles or 3-6 months (depending on driving conditions and oil used)

Engine Oil Filter Replacement:

With every oil change

Air Filter Replacement:

Every 15,000-30,000 miles or as needed

Cabin Air Filter Replacement:

Every 15,000-30,000 miles or as needed

Spark Plug Replacement:

Every 30,000-60,000 miles (NGK Iridium recommended)

Timing Belt Replacement:

Every 60,000-100,000 miles or 5-7 years (critical component)

Coolant Flush:

Every 30,000 miles or 2-3 years

Brake Fluid Flush:

Every 2 years

Transmission Fluid Change:

Every 30,000-50,000 miles

Differential Fluid Change Front Rear:

Every 30,000-50,000 miles

Fluid Specifications

Engine Oil Type And Viscosity:

5W-30 or 10W-30 (API SN or higher)

Engine Oil Capacity:

4.5 Liters (4.8 US Quarts) with filter change

Coolant Type:

Subaru Super Coolant (Blue) or equivalent Long Life Antifreeze/Coolant (50/50 mix)

Brake Fluid Type:

DOT 3 or DOT 4

Power Steering Fluid Type:

Subaru Extra-PS Fluid or Dexron III/Mercon ATF

Known Issues

Piston Ring Wear:

Potential for oil consumption and blow-by due to EJ207 ring design, especially if poorly maintained or driven hard.

Head Gasket Leaks:

While less common on the EJ207 compared to some other EJ variants, it's a potential issue to monitor, especially with higher mileage or aggressive tuning.

Turbocharger Failure:

The IHI VF34 turbo can be susceptible to wear or failure if oil is not changed regularly or if the turbo is subjected to extreme heat cycling without proper cool-down.

Clutch Wear:

High-performance clutch can wear faster with aggressive driving; torque converter lifespan can also be affected.

Suspension Bushings:

Wear and tear on suspension bushings is common over time, affecting handling and ride comfort.

Electrical Gremlins:

As with many turbocharged performance cars of this era, intermittent electrical issues can arise, often related to sensor connections or wiring harnesses.

📚 Vehicle History

Brand Heritage

Rally Icon:

Subaru's strong association with the World Rally Championship (WRC)

AWD Pioneer:

Subaru's long history of producing all-wheel-drive vehicles for various conditions

Model Evolution

Generation Intro:

This is part of the second generation (GD/GG) Impreza, known for its significant performance upgrades and distinct 'bug-eye' to 'hawk-eye' design changes.

Sti Specialization:

The STi (Subaru Tecnica International) model represents the highest performance variant, directly influenced by rally technology.

Production

Production Period:

The second generation Impreza was produced from 2000 to 2007. The 2004 model year represents a mid-cycle facelift for this generation.

Manufacturing Location:

Japan

🏆 Awards & Recognition

Recognitions

Rally Influence:

The Impreza STi is directly derived from Subaru's successful WRC cars, inheriting their performance DNA and reputation.

Performance Car Of The Year:

While specific awards for the 2004 model year might vary by publication, the STi consistently received accolades in enthusiast circles for its handling, AWD grip, and affordable performance.

Certifications

Emissions Compliance:

Meets applicable emissions standards for its market of origin (e.g., JDM regulations)