🏷️ Basic Information

Make:

Subaru

Model:

Omega

Model Years Covered:

1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994

Chassis Codes:

Likely variants based on Subaru's internal nomenclature for their sedan/coupe lines during that era, specific to the Omega model which may have been region-specific or a misnomer for a Subaru Leone/Loyale variant in some markets. Without further market clarification, general Subaru chassis codes of the era apply.

Engine Codes:

EA81, EA82 (common Subaru boxer engines of the period). Specific variants like EA82T for turbocharged models.

👋 Introduction

Market Position:

The Subaru Omega, likely a regional market designation or a specific trim level, occupied a niche within the compact to mid-size sedan/coupe segment. Subaru was known for its boxer engines and often standard Symmetrical All-Wheel Drive (AWD) in many markets, appealing to buyers seeking durability and all-weather capability, though front-wheel drive variants were also common.

Competitive Analysis:

Competed against vehicles like the Toyota Corolla, Honda Civic, Nissan Sentra, Mitsubishi Lancer, and Ford Escort in its segment. Subaru's differentiators were its unique horizontally opposed engine configuration and often its AWD system, setting it apart from many front-wheel-drive competitors.

Key Features:

Subaru's signature boxer engine providing a lower center of gravity, often available Symmetrical All-Wheel Drive for enhanced traction, durable construction, and a reputation for reliability. Trim levels likely varied from basic economy to more equipped models with features like power windows, air conditioning, and premium audio.

📋 Manual Details

Coverage Areas:

Comprehensive coverage for all Subaru Omega models from 1984 through 1994. Includes mechanical, electrical, bodywork, and diagnostics for all major systems.

Page Count:

Estimated 1000+ pages (typical for comprehensive service manuals covering multiple years).

Manual Type:

Service and Repair Manual

Language:

English

Format:

PDF Download

📖 Manual Coverage

Systems Covered:

Engine mechanical, engine electrical, fuel system, ignition system, cooling system, lubrication system, exhaust system, clutch, manual transmission, automatic transmission, drive shafts, differentials, suspension (front and rear), steering, brakes (hydraulic, parking), wheels and tires, body and frame, interior trim, heating and air conditioning, electrical systems (lighting, wipers, power accessories), and diagnostic procedures.

Procedures Included:

Routine maintenance (oil changes, filter replacements, spark plugs, belts, fluids), component testing and diagnosis, disassembly and reassembly of all major mechanical and electrical components, torque specifications, wiring diagrams, troubleshooting guides, body repair procedures, HVAC system servicing, and diagnostic trouble code interpretation.

Technical Depth:

Detailed technical information suitable for professional mechanics and experienced DIY enthusiasts. Covers everything from basic adjustments to complete engine and transmission overhauls, including detailed diagnostic flowcharts and schematics.

📊 Manual Specifications

File Format:

High-resolution PDF, optimized for digital viewing and printing.

Print Quality:

Clear, legible text and high-quality, reproducible diagrams and illustrations.

Binding Type:

N/A (Digital Download - PDF)

Paper Type:

N/A (Digital Download - PDF)

⚙️ Engine Specifications

Primary Engine:

Subaru's EA82 horizontally opposed (boxer) four-cylinder engine. Displacement typically around 1.8 liters (1795cc). Turbocharged variants (EA82T) were also common, particularly in sportier trims.

Horsepower Range:

Naturally aspirated: 70-95 hp. Turbocharged: 100-135 hp (approximate, depending on specific tuning and market).

Torque Range:

Naturally aspirated: 90-110 lb-ft. Turbocharged: 120-145 lb-ft (approximate).

Fuel System:

Fuel injection (multi-point or single-point) for most models, especially later years. Carbureted versions may exist for earlier models or specific markets.

Engine Layout:

Horizontally opposed (Boxer) 4-cylinder

Ignition System:

Electronic ignition system with distributor.

Cooling System:

Pressurized liquid cooling system.

Emissions Control:

Catalytic converter, oxygen sensors, EGR (Exhaust Gas Recirculation) system, depending on market and year.

🔧 Transmission

Standard Transmission:

5-speed manual transmission.

Optional Transmission:

3-speed or 4-speed automatic transmission, depending on model year and trim.

Drivetrain Options:

Front-Wheel Drive (FWD) and Symmetrical All-Wheel Drive (AWD) options were available.

Manual Transmission Fluid Spec:

GL-5 Gear Oil (e.g., SAE 75W-90 or 80W-90).

Automatic Transmission Fluid Spec:

Dexron II or equivalent.

📐 Dimensions

Exterior Length:

Varies by body style (sedan, coupe, wagon), typically around 165-175 inches.

Exterior Width:

Varies by body style, typically around 65-67 inches.

Exterior Height:

Varies by body style, typically around 54-57 inches for sedans/coupes.

Curb Weight:

Approximately 2200-2700 lbs, depending on configuration (engine, AWD, options).

Gross Vehicle Weight Rating:

Typically around 3500-3800 lbs.

Wheelbase:

Approximately 97.6 inches.

🛡️ Safety Features

NHTSA Ratings:

No specific NHTSA ratings readily available for this specific 'Omega' designation or these older models. Era safety standards were less stringent than today.

Active Features:

Front disc brakes, rear drum brakes (standard). Optional ABS (Anti-lock Braking System) on some higher trims/later models. Power-assisted brakes.

Passive Features:

Seat belts (three-point front, two-point rear), energy-absorbing steering column, reinforced body structure.

Lighting System:

Halogen headlights (likely sealed beam on early models, composite on later ones), front and rear parking lamps, brake lights, turn signals.

💡 Technology Features

Infotainment System:

Basic AM/FM radio with cassette player. Optional premium sound systems with more speakers. Analog gauges for speedometer, tachometer, fuel, and engine temperature.

Driver Assistance:

Limited by era. Cruise control was a common option. Anti-lock Braking System (ABS) became available on higher trims or later models. No advanced driver-assistance systems (ADAS) like adaptive cruise control or lane-keeping assist.

Connectivity:

No integrated Bluetooth or USB connectivity. Basic accessory power outlets for charging devices.

Climate Control Options:

Manual heating and air conditioning controls. Some models featured automatic climate control.

🔧 Maintenance

Oil Change Interval:

Every 3,750 miles or 6 months, whichever comes first (using conventional oil). 7,500 miles or 6 months for synthetic oil (refer to specific manual for confirmation).

Air Filter Replacement Interval:

Every 15,000-30,000 miles or as needed based on driving conditions.

Spark Plug Replacement Interval:

Every 30,000-60,000 miles, depending on spark plug type (copper, platinum).

Timing Belt Replacement Interval:

Critical component. Typically 60,000-105,000 miles or 5-7 years, whichever comes first. Failure can cause severe engine damage.

Engine Oil Spec:

API SG or higher, SAE 10W-30 or 10W-40 recommended for most conditions. Check manual for specific temperature ranges.

Coolant Spec:

Ethylene glycol-based antifreeze (green type) mixed 50/50 with distilled water. Capacity: approx. 6-7 quarts.

Brake Fluid Spec:

DOT 3 or DOT 4 brake fluid.

Common Issues:

Head gasket leaks (especially on EA82 engines, though less prevalent than later EJ series), rust and corrosion (particularly in wheel wells, rocker panels, and subframes), CV joint wear (on AWD models), alternator failure, ignition system component wear (coil packs, igniter), exhaust manifold cracks (on some turbocharged models).

Oil Filter Part Number Example:

Fram PH7317, Wix 51515 (verify for specific engine variant).

Air Filter Part Number Example:

Fram CA3511, Wix 42515 (verify for specific engine variant).

📚 Vehicle History

Brand Heritage:

Subaru, a division of Fuji Heavy Industries, has a history dating back to aircraft manufacturing. The company entered the automotive market with small, practical cars known for their boxer engines and, increasingly, their all-wheel-drive capabilities, establishing a reputation for engineering and durability.

Model Evolution:

The Subaru Omega likely represents a generation of Subaru's compact/mid-size sedan and coupe offerings that evolved from the Subaru Leone (produced until 1994 in many markets). This era saw significant upgrades in styling, technology, and performance, with the introduction of the EA82 engine and widespread availability of AWD. This generation laid the groundwork for future Subaru models like the Impreza and Legacy.

Production Period:

1984-1994 (as per manual coverage).

Production Locations:

Primarily manufactured in Japan by Subaru Corporation (formerly Fuji Heavy Industries).

🏆 Awards & Recognition

Recognitions:

Specific awards for the 'Omega' designation are not widely documented; however, Subaru vehicles of this era were often praised for their durability, reliability, and all-weather capabilities by automotive journalists and consumer reports.

Ratings:

Subaru often ranked well in owner satisfaction surveys for reliability and performance, especially regarding their AWD systems.

Certifications:

Standard emissions certifications for the respective markets (e.g., EPA in the US) during the production years.