Subaru Impreza WRX STI 2007 Service Repair Workshop Manual

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🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2007 Codes Chassis Code: GD Engine Code: EJ257 👋 Introduction Market Position Positioning: Performance-oriented compact sedan/hatchback, a benchmark in...

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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-oriented compact sedan/hatchback, a benchmark in rally-bred street cars.

Competitive Analysis

Key Competitors:

Mitsubishi Lancer Evolution, Ford Focus RS, Honda Civic Type R.

Key Features

Performance Focus:

Symmetrical All-Wheel Drive (AWD), turbocharged Boxer engine, performance-tuned suspension.

Rally Heritage:

Direct lineage from Subaru's World Rally Championship success, embodying performance and durability.

Manual Value Proposition

Target Audience:

Enthusiasts, DIY mechanics, and professional technicians working on the 2007 Subaru Impreza WRX STI.

📋 Manual Details

Coverage Areas

Primary Coverage:

Full service, repair, diagnostics, and maintenance

Page Count

Estimated Pages:

1500+

Manual Type

Type:

Factory Service Manual / Workshop Manual

Language

Language:

English

Format

Format:

Digital (likely PDF)

📖 Manual Coverage

Systems Covered

Engine Mechanical:

Engine assembly, disassembly, overhaul, cooling system, lubrication system, fuel system, emissions control, turbocharger system.

Engine Management:

Engine control unit (ECU) diagnostics, sensor operation, fuel injection control, ignition timing, emissions controls.

Transmission:

Manual transmission (TY85) overhaul, clutch system, drivetrain, differentials (front, center, rear).

Suspension:

Front and rear suspension systems, struts, springs, anti-roll bars, alignment specifications.

Brakes:

Brake system overhaul, ABS, front Brembo calipers, rear calipers, brake fluid specifications, bleeding procedures.

Electrical:

Wiring diagrams, charging system, starting system, lighting, body electrical systems, power accessories, HVAC controls, ECU pinouts.

Body And Chassis:

Body panel removal and installation, interior trim, exterior trim, glass, chassis components.

Heating Ventilation And Air Conditioning:

HVAC system operation, refrigerant service, blower motor, climate control unit.

Procedures Included

Maintenance:

Oil changes, filter replacements, fluid checks and top-offs, spark plug replacement, belt inspection and replacement, brake pad replacement.

Troubleshooting:

Diagnostic procedures for common drivability issues, electrical faults, mechanical problems, fault code interpretation.

Repair:

Detailed step-by-step instructions for component removal, repair, and reinstallation for all major systems.

Diagnostics:

Engine and vehicle diagnostic procedures using scan tools, multimeter testing, and specialized equipment.

Specifications:

Torque specifications for all fasteners, measurement specifications, and critical component clearances.

Technical Depth

Depth Level:

Comprehensive: from basic maintenance to full engine and transmission rebuilds, including electrical system diagnostics.

📊 Manual Specifications

File Format

File Type:

Searchability:

Likely text-searchable if a well-OCR'd scan

Print Quality

Clarity:

High (typical for factory service manuals)

Illustrations:

Includes detailed diagrams, schematics, and photographic illustrations.

Binding Type

Binding:

N/A (Digital format)

Paper Type

Paper:

N/A (Digital format)

⚙️ Engine Specifications

Primary Engine

Engine Type:

Horizontally Opposed (Boxer) 4-cylinder

Engine Code:

EJ257

Displacement:

2.5 Liters (2457 cc)

Aspiration:

Turbocharged and Intercooled

Performance

Horsepower Rating:

305 hp @ 6000 rpm (USA/Japan Spec)

Torque Rating:

290 lb-ft @ 3500 rpm (USA/Japan Spec)

Fuel System

Fuel Delivery:

Multi-point Fuel Injection (MPI)

Fuel Type:

Premium Unleaded Gasoline (91+ octane recommended)

Engine Mechanical

Bore X Stroke:

99.5 mm x 79.0 mm

Compression Ratio:

8.2:1

Valvetrain:

DOHC, 16 valves, Subaru's Variable Valve Lift and Timing (VVL/VVT) on intake camshaft.

🔧 Transmission

Standard

Transmission Type:

6-speed Manual Transmission (TY85)

Drivetrain:

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

Optional

Optional Transmission:

N/A (STI models exclusively featured a 6-speed manual)

Features

Center Differential:

Driver Controlled Center Differential (DCCD) with auto and manual modes.

Rear Differential:

Helical Limited Slip Front Differential, Viscous Coupling Center Differential, and a mechanical Limited Slip Rear Differential.

Fluid Specs

Manual Transmission Fluid:

GL-5 Hypoid Gear Oil, SAE 75W-90. (e.g., Subaru Extra-S Gear Oil or equivalent)

Front Differential Fluid:

GL-5 Hypoid Gear Oil, SAE 75W-90.

Rear Differential Fluid:

GL-5 Hypoid Gear Oil, SAE 75W-90.

📐 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)

Ground Clearance:

140 mm (5.5 in)

Weights

Curb Weight:

Approx. 1505 kg (3318 lbs)

Gross Vehicle Weight Rating:

Not explicitly stated, but generally around 1900-2000 kg.

Cargo

Trunk Volume:

Approx. 350-400 Liters (sedan varies by market)

🛡️ Safety Features

Ratings

NHTSA Front Impact:

5-Star (for driver and passenger, 2007 model year front-end structure rating)

IIHS Side Impact:

Good (for 2003-2008 Impreza)

Active Features

Standard Anti-lock Braking System (ABS) with Electronic Brake-force Distribution (EBD).

Traction Control:

Standard Traction Control System (TCS).

Stability Control:

Standard Vehicle Dynamics Control (VDC) which includes stability and traction control functions.

Passive Features

Airbags:

Front dual-stage airbags, front side-impact airbags, side-curtain airbags (front and rear).

Seatbelts:

3-point ELR seatbelts with pretensioners and force limiters in front.

Child Anchors:

LATCH (Lower Anchors and Tethers for Children) system.

💡 Technology Features

Infotainment

Head Unit:

Factory-installed AM/FM/CD player with auxiliary input (may vary by trim/market).

Speaker System:

Standard 6-speaker audio system.

Driver Assistance

Cruise Control:

Standard electronic cruise control.

Instrument Cluster:

Performance-oriented gauge cluster with tachometer, speedometer, boost gauge, and warning lights.

Connectivity

Auxiliary Input:

3.5mm auxiliary audio input jack.

Comfort Features

Climate Control:

Manual climate control with A/C and heater.

Seats:

Alcantara and leather-trimmed sport seats with driver's seat height adjustment.

🔧 Maintenance

Service Intervals

Oil Change Interval:

Every 3,750 miles (6,000 km) or 3 months (severe duty) / 7,500 miles (12,000 km) or 6 months (normal duty). Consult manual for exact conditions.

Engine Air Filter:

Inspect every 15,000 miles (24,000 km), replace as needed. Recommended replacement around 30,000 miles (48,000 km).

Cabin Air Filter:

Replace annually or every 15,000 miles (24,000 km).

Spark Plugs:

Iridium type, replace approximately every 60,000 miles (96,000 km).

Timing Belt Replacement:

N/A (EJ257 uses a timing chain).

Fluid Specifications

Engine Oil Capacity:

Approx. 4.8 US quarts (4.5 Liters) with filter change.

Engine Oil Type:

0W-30 or 5W-30 Synthetic oil meeting API SN or higher and ILSAC GF-5 or higher standards.

Coolant Type:

Subaru Super Coolant (Blue) or equivalent long-life silicate-free coolant.

Brake Fluid Type:

DOT 3 or DOT 4.

Known Issues

Head Gaskets:

While less common on EJ257 than EJ255, head gasket failures can still occur, often related to overheating or detonation.

Piston Ring Land Failure:

Ring land failure (cracking) can occur on high-mileage or aggressively driven EJ257 engines, often due to detonation.

Clutch Wear:

Due to the performance nature, clutches can wear faster than on standard vehicles, especially with hard use.

Turbo Failures:

Oil starvation or contamination can lead to turbocharger failure; regular oil changes with quality oil are crucial.

📚 Vehicle History

Brand Heritage

Rally Roots:

Subaru's extensive success in the World Rally Championship (WRC) heavily influenced the development of the WRX and STI models.

Model Evolution

Second Generation:

The 2007 model is part of the second generation Impreza (GD/GG chassis), often referred to as the 'hawkeye' revision due to its distinctive headlights.

Sti Distinction:

The STI (Subaru Tecnica International) variant represents the highest performance trim, featuring a more powerful engine, enhanced drivetrain, and upgraded suspension and brakes compared to the WRX.

Production

Production Location:

Mainly manufactured in Gunma, Japan.

Production Years

Gd Chassis Production:

2000-2007 (with facelifts).

🏆 Awards & Recognition

Recognitions

Road And Track Best Handling:

The Impreza WRX STI, across generations, frequently received accolades for its handling and performance from automotive publications.

Sports Compact Of The Year:

Various automotive awards for sports compact and performance car categories.

Ratings

Edmunds Car Reviews:

Highly praised for its all-wheel-drive system, powerful engine, and handling prowess.