Subaru Impreza WRX STI 2014 Workshop Repair Service Manual

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🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2014 Codes Chassis Code: GVB/GRF (Hatchback), VAB (Sedan) Engine Codes: EJ257 (2.5L Turbocharged Boxer) 👋 Introduction Market Position Segment:...

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标签: 2014 Car Cars Impreza WRX STI Misc Subaru

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Description

🏷️ Basic Information

Identification

Make:

Subaru

Model:

Impreza WRX STI

Year:

Codes

Chassis Code:

GVB/GRF (Hatchback), VAB (Sedan)

Engine Codes:

EJ257 (2.5L Turbocharged Boxer)

👋 Introduction

Market Position

Segment:

Performance Compact Sedan/Hatchback (All-Wheel Drive Rally-Inspired).

Competitive Analysis

Key Competitors:

Mitsubishi Lancer Evolution, Volkswagen Golf R, Ford Focus RS.

Key Features

Vehicle Philosophy:

Blend of daily drivability and track-inspired performance, symmetrical all-wheel drive, turbocharged boxer engine, driver-focused cockpit.

📋 Manual Details

Coverage Areas

General Coverage:

All Models, Engines, Trims

Page Count

Estimated Page Count:

3000+

Manual Type

Manual Type:

Workshop Repair Service Manual

Language

Language:

English

Format

Format:

PDF Download

📖 Manual Coverage

Systems Covered

Engine Mechanical:

Engine overhaul, diagnosis, repair procedures, timing belt/chain, cylinder head, pistons, crankshaft, lubrication system, cooling system.

Engine Management:

Fuel injection, ignition system, emissions control, ECU diagnosis, sensor testing, turbocharger system.

Transmission:

6-speed manual transmission (TY85) repair, overhaul, clutch replacement, AWD system (DCCD) service and diagnosis.

Drivetrain:

Front and rear differentials, driveshafts, hub assemblies, wheel bearings.

Suspension:

Front and rear suspension components, struts, springs, bushings, alignment specifications.

Brakes:

Brake system diagnosis, hydraulic system, ABS, EBD, brake pad/rotor replacement, caliper service, parking brake.

Steering:

Power steering system, steering rack, tie rods, steering column.

Electrical System:

Battery, charging system, starter, lighting, power windows, central locking, infotainment, wiring diagrams.

Body And Chassis:

Body panel repair, rust prevention, interior trim removal, glass replacement.

HVAC:

Air conditioning, heating, ventilation system diagnosis and repair.

Safety Systems:

Airbag system diagnosis and service, seatbelt mechanisms.

Procedures Included

Preventative Maintenance:

Oil change, filter replacement, fluid checks, spark plug replacement, brake inspection, tire rotation.

Troubleshooting:

Diagnostic trouble codes (DTCs), symptom-based troubleshooting guides, electrical circuit testing.

Repair Procedures:

Step-by-step instructions for component removal, installation, and adjustment for all major systems.

Diagnostics:

Detailed guides on using diagnostic tools, interpreting sensor data, and pinpointing faults.

Special Tools:

Identification and usage of Subaru-specific tools required for certain procedures.

Technical Depth

Depth Level:

Comprehensive (from basic maintenance to full engine rebuilds and complex electrical diagnostics).

📊 Manual Specifications

File Format

File Type:

Searchability:

Searchable text content for quick information retrieval.

Printability:

Printable pages, allowing for physical reference.

Print Quality

Image Clarity:

High-resolution diagrams, illustrations, and photographs.

Binding Type

Binding:

N/A (Digital PDF)

Paper Type

Paper:

N/A (Digital PDF)

⚙️ Engine Specifications

Primary Engine

Engine Type:

2.5L DOHC Turbocharged Boxer Engine (EJ257).

Performance

Horsepower:

305 hp @ 6000 rpm (approx).

Torque:

290 lb-ft @ 4000 rpm (approx).

Fuel System

Fuel Delivery:

Multi-point Fuel Injection (MPI) with Sequential Electronic Fuel Injection.

Fuel Type:

Premium Unleaded Gasoline (91 Octane or higher recommended).

Technical Details

Bore X Stroke:

99.5 mm x 79.0 mm (approx).

Compression Ratio:

9.0:1 (approx).

Turbocharger:

IHI VF48 Twin-Scroll Turbocharger with intercooler.

🔧 Transmission

Standard

Transmission Type:

6-speed Manual Transmission (TY85).

Optional

Optional Transmission:

N/A for 2014 WRX STI (Manual only).

Features

Dccd:

Driver Controlled Center Differential (DCCD) for variable front-to-rear torque distribution.

AWD System:

Symmetrical All-Wheel Drive.

📐 Dimensions

Exterior

Wheelbase:

103.3 inches (2625 mm) for Hatchback, 104.9 inches (2665 mm) for Sedan.

Length:

173.8 inches (4415 mm) for Hatchback, 180.9 inches (4595 mm) for Sedan.

Width:

70.7 inches (1795 mm).

Height:

58.1 inches (1475 mm) for Hatchback, 57.9 inches (1470 mm) for Sedan.

Weights

Curb Weight:

Approx. 3373-3417 lbs (1530-1550 kg) depending on body style.

Gross Weight Rating:

Approx. 4500 lbs (2041 kg).

Cargo

Cargo Volume Hatchback:

Approx. 19.0 cu ft (rear seats up).

Cargo Volume Sedan:

Approx. 11.3 cu ft.

🛡️ Safety Features

Ratings

NHTSA Overall:

5-Star Overall Safety Rating (for comparable models/years, specific STI ratings may vary).

IIHS Ratings:

Good ratings in most IIHS crashworthiness tests for comparable models.

Active Features

Anti-lock Braking System.

Electronic Brake-force Distribution.

Vehicle Stability Control.

Traction Control:

Traction Control System (TCS).

Passive Features

Airbags:

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

Seatbelts:

3-point height-adjustable front seatbelts with pretensioners and force limiters, rear 3-point seatbelts.

Child Anchors:

LATCH (Lower Anchors and Tethers for CHildren) system.

💡 Technology Features

Infotainment

Head Unit:

Standard touchscreen infotainment system with CD/MP3 player, SiriusXM Satellite Radio capability, Bluetooth hands-free phone and audio streaming.

Audio System:

Available Rockford Fosgate premium audio system.

Driver Assistance

Cruise Control:

Standard cruise control.

Backup Camera:

Available backup camera.

Connectivity

Usb Ports:

Standard USB port for device charging and audio input.

Auxiliary Input:

Standard auxiliary audio input jack.

🔧 Maintenance

Service Intervals

Oil Change Interval:

Every 3,750 miles or 6 months, whichever comes first (under severe driving conditions), or 7,500 miles/12 months for normal conditions (refer to manual for specific details).

Engine Air Filter:

Replace every 15,000 miles or 12 months.

Cabin Air Filter:

Replace every 15,000 miles or 12 months.

Spark Plugs:

Replace every 30,000 miles (for iridium-tipped plugs).

Coolant Replacement:

Initial replacement at 60,000 miles or 60 months, then every 30,000 miles or 30 months thereafter.

Fluid Specifications

Engine Oil:

SAE 5W-30 (API SN or higher, ILSAC GF-5 or higher). Recommended: Subaru Synthetic Ester Oil 0W-20 (if permitted by manual for specific climate/use).

Transmission Fluid:

Subaru Extra-S Gear Oil (75W-90 GL-5) or equivalent for manual transmission and differentials.

Brake Fluid:

DOT 3 or DOT 4.

Coolant:

Subaru Super Coolant (Blue) or equivalent P-HOAT coolant (50/50 mix with distilled water).

Known Issues

Engine Reliability:

Head gasket failures (less common on EJ257 compared to earlier EJ25), piston ring land failures in high-stress applications, oil consumption.

Turbocharger:

Bearing wear, oil starvation if maintenance is neglected.

Clutch:

Can wear prematurely with aggressive driving.

Dccd:

Potential failure of the DCCD unit over time, especially with moisture ingress or heavy use.

Suspension:

Wear on bushings and end links due to performance-oriented setup.

📚 Vehicle History

Brand Heritage

Brand Focus:

Subaru's heritage in rally racing and its commitment to All-Wheel Drive technology.

Model Evolution

Third Generation:

The 2014 model represents the final iteration of the GR/GV generation of the Impreza WRX STI, known for its distinctive hatchback and sedan body styles, and a significant focus on performance tuning.

Production

Assembly Location:

Ota City, Gunma Prefecture, Japan.

🏆 Awards & Recognition

Recognitions

Motortrend Award:

While the 2014 model itself may not have a specific major award listed, previous generations and the STI lineage have been lauded by automotive publications for their performance and handling.

Ratings

Car And Driver Ranking:

Consistently ranked among the best performance cars in its class by Car and Driver and other automotive media.

Certifications

Emissions Compliance:

Meets all applicable EPA and California Air Resources Board (CARB) emissions standards for its model year.