🏷️ Basic Information

Make:

Mitsubishi

Model:

Eclipse

Year:

1991

Chassis Code:

D22A (coupe), D27A (spyder)

Platform:

Mitsubishi E platform (also shared with Eagle Talon and Plymouth Laser)

👋 Introduction

Segment:

Compact sports coupe/convertible

Target Audience:

Enthusiasts, DIY mechanics, professional automotive technicians.

Competitors:

Mazda MX-6, Toyota Celica, Honda Prelude, Nissan 240SX, Ford Probe.

Design Philosophy:

Aerodynamic styling, front-engine, front-wheel drive (or optional all-wheel drive), sporty handling.

Unique Selling Points:

Available turbocharged engines, optional AWD, distinctive styling, aggressive performance for its class.

📋 Manual Details

Coverage:

Complete service and repair information for the 1991 Mitsubishi Eclipse.

Page Count:

Estimated 1000+ pages (typical for factory service manuals of this era).

Manual Type:

Factory Service Manual / Repair Manual

Language:

English

Format:

PDF Download

📖 Manual Coverage

Engine Systems:

Engine mechanical (dismantling, assembly, inspection), engine management systems (EFI, ignition), emissions control systems, cooling system, lubrication system, fuel system.

Transmission Systems:

Manual transmission (F5M33, F5M23), automatic transmission (A543), clutch system, transfer case (for AWD models).

Drivetrain Systems:

Front-wheel drive (FWD), All-wheel drive (AWD) system, differentials, driveshafts, axles.

Suspension And Steering:

Front suspension (MacPherson struts), rear suspension (independent multi-link), power steering system, steering column.

Brake Systems:

Front disc brakes, rear drum/disc brakes (depending on trim), anti-lock braking system (ABS) for equipped models, parking brake.

Electrical Systems:

12V electrical system, battery, charging system (alternator), starting system, lighting system, instrumentation, power windows, power door locks, audio system wiring, fuse box and relay locations.

HVAC Systems:

Heating, ventilation, and air conditioning (HVAC) system operation, diagnosis, and repair.

Body And Interior:

Body panel removal and installation, interior trim, door mechanisms, hood, trunk, glass replacement.

Maintenance Procedures:

Routine maintenance (oil changes, filter replacements, tune-ups), spark plug replacement, belt inspection and replacement, fluid checks and changes.

Repair Procedures:

Engine overhaul, transmission repair, brake caliper and rotor replacement, suspension component replacement, electrical component diagnosis and repair, fuel injector service.

Troubleshooting Guides:

Diagnostic flowcharts for common drivability issues, electrical faults, and mechanical problems.

Special Tools:

Identification of specific tools required for certain repair procedures.

Depth:

Comprehensive, covering basic maintenance to complex engine and transmission overhauls. Includes detailed diagrams, specifications, and diagnostic procedures.

📊 Manual Specifications

File Format:

Searchable PDF

Print Quality:

High-resolution scans, suitable for printing individual pages or the entire manual.

Binding Type:

N/A (Digital Download)

Paper Type:

N/A (Digital Download)

⚙️ Engine Specifications

Engine 1 Code:

4G63 (DOHC)

Engine 1 Type:

2.0L Inline-4 Turbocharged

Engine 1 Displacement:

1997 cc

Engine 1 Horsepower:

195 hp @ 6000 rpm

Engine 1 Torque:

203 lb-ft @ 3500 rpm

Engine 1 Compression Ratio:

8.5:1

Engine 2 Code:

4G63 (SOHC)

Engine 2 Type:

2.0L Inline-4 Naturally Aspirated

Engine 2 Displacement:

1997 cc

Engine 2 Horsepower:

135 hp @ 6000 rpm

Engine 2 Torque:

137 lb-ft @ 3000 rpm

Fuel Delivery:

Electronic Fuel Injection (EFI)

Fuel Type:

Unleaded gasoline

Ignition System:

Electronic ignition with distributor

🔧 Transmission

Transmission Type Base:

5-speed manual

Transmission Type Optional:

4-speed automatic

AWD Availability:

Available on turbocharged models with 5-speed manual transmission.

Manual Transmission Fluid:

API GL-4, SAE 75W-90 or 75W-85 (check specific manual for exact fill).

Automatic Transmission Fluid:

Mitsubishi DiaQueen J3 or equivalent ATF SP-II (check specific manual for exact fill).

📐 Dimensions

Length:

Approx. 172.2 inches (4374 mm)

Width:

Approx. 69.1 inches (1755 mm)

Height:

Approx. 50.0 inches (1270 mm)

Wheelbase:

Approx. 98.7 inches (2507 mm)

Curb Weight:

Approx. 2800 - 3100 lbs (1270 - 1406 kg), varies by trim and drivetrain.

Wheel Size Base:

16 inch alloy wheels

Tire Size Base:

205/55R16

Bolt Pattern:

5x114.3 mm (5x4.5 inches)

🛡️ Safety Features

NHTSA Ratings:

N/A (Crash testing protocols and reporting were different in 1991; specific NHTSA ratings not readily available for this model year.)

Braking:

Optional Anti-lock Braking System (ABS) on some models.

Airbags:

Driver-side airbag standard on most models.

Seatbelts:

Three-point seatbelts with pretensioners.

Body Structure:

Reinforced safety cage construction.

💡 Technology Features

Audio System:

Factory AM/FM cassette player with optional CD changer. Basic speaker system.

Cruise Control:

Available as an option on most trims.

Antenna:

Power antenna on higher trims.

🔧 Maintenance

Oil Change Interval:

Every 3,750 miles (6,000 km) or 3 months, whichever comes first (using API SG or equivalent).

Engine Air Filter Replacement:

Every 15,000 miles (24,000 km) or 12 months.

Spark Plug Replacement:

Every 30,000 miles (48,000 km) for standard plugs; platinum plugs may have longer intervals (check specific engine). Recommended plug: NGK BKR6E-11 (for turbo) or BKR5E-11 (for NA).

Timing Belt Replacement:

Every 60,000 miles (96,000 km) or 5 years for the 4G63 engine. This is a critical maintenance item.

Engine Oil Capacity:

Approx. 4.2 US quarts (4.0 liters) with filter change (for 4G63 engines). Verify in manual.

Coolant Type:

Ethylene glycol based coolant (green) with a 50/50 mix of antifreeze and distilled water.

Brake Fluid Type:

DOT 3 or DOT 4.

Turbo Seal Failure:

Premature turbocharger seal failure can lead to oil consumption and smoking, often due to heat and lack of proper cool-down procedures.

Timing Belt Tensioner:

Failure of the timing belt tensioner can cause belt slippage and catastrophic engine damage.

Oxygen Sensor Failure:

Oxygen sensors can degrade over time, affecting fuel economy and emissions.

Power Steering Pump Leaks:

Common leaks can develop from the power steering pump or hoses.

Clutch Wear:

Clutch wear is typical for manual transmissions, especially in performance-oriented driving.

📚 Vehicle History

Mitsubishi Motors History:

Mitsubishi Motors has a long history of automotive production, known for its engineering prowess, especially in turbocharged engines and four-wheel-drive systems.

Eclipse Generation 1:

The first generation Eclipse (1990-1994) was a collaboration between Mitsubishi and Chrysler (Diamond-Star Motors). It was available as a coupe and later a convertible (Spyder).

1991 Model Year Updates:

The 1991 model year saw minor refinements, including potentially new wheel designs or minor trim adjustments. The core mechanicals and styling remained consistent with the 1990 launch.

Manufacturing Location:

Normal, Illinois, USA (Diamond-Star Motors plant)

🏆 Awards & Recognition

Car And Driver 10Best:

The Mitsubishi Eclipse GSX (turbo, AWD) was named to Car and Driver's 10 Best list for 1991, highlighting its performance and value.