🏷️ Basic Information

Make:

Buick

Model:

Regal

Year:

1991

Chassis Code:

GM W-body

👋 Introduction

Target Audience:

DIY enthusiasts, independent repair shops, Buick Regal owners

Comparison To Printed Manuals:

More convenient, accessible, and cost-effective than traditional printed manuals.

Licensing:

Officially licensed, derived from OE (Original Equipment) materials

Access:

1-year access with discounts for extensions, compatible with PC, laptop, smartphone, tablet

📋 Manual Details

Regions Covered:

North America

Estimated Page Count:

1500+

Type:

Official Service and Repair Manual Software

Language:

English

Format:

PDF Download (Licensed Software)

📖 Manual Coverage

Powertrain:

Engine, Transmission, Drivetrain (Front-Wheel Drive)

Chassis:

Suspension, Steering, Brakes, Wheels, Tires

Electrical:

Wiring Diagrams, Lighting, Ignition, Starting, Charging, Instrumentation, Audio System, HVAC Controls

Body:

Exterior Body Panels, Interior Trim, Glass, Doors, Locks, Seats, HVAC System (Cooling and Heating)

Maintenance:

Scheduled Maintenance, Fluid Checks and Changes, Filter Replacements, Lubrication

Troubleshooting:

Diagnostic Procedures, Fault Code Interpretation, Symptom-Based Diagnosis

Repair:

Component Removal and Installation, Major Component Overhaul, System Repairs

Diagnostics:

Engine Performance Diagnostics, Electrical System Troubleshooting, HVAC System Diagnosis

Depth:

Comprehensive (from basic maintenance to complete engine and transmission rebuilds)

📊 Manual Specifications

Quality:

High-resolution, searchable text

Searchability:

Full text search functionality

Printability:

Printable pages

Binding:

N/A (Digital Software)

Paper:

N/A (Digital Software)

⚙️ Engine Specifications

Engine Options:

3.1L V6 (RPO LG6), 3.8L V6 (RPO L27 - Gran Sport)

3.1L V6 Horsepower:

140 hp @ 4400 rpm (approx.)

3.1L V6 Torque:

180 lb-ft @ 3200 rpm (approx.)

3.8L V6 Horsepower:

170 hp @ 4800 rpm (approx.)

3.8L V6 Torque:

220 lb-ft @ 2400 rpm (approx.)

Fuel Delivery:

Multi-Port Fuel Injection (MPFI)

Ignition System:

Distributorless Ignition System (DIS) or distributor-based ignition (depending on specific engine variant)

🔧 Transmission

Transmission Options:

4-speed Automatic (4T60/4T60-E)

Optional Transmission:

N/A (Automatic was standard across the range)

Transmission Control:

Electronic controls for 4T60-E variants

📐 Dimensions

Body Styles:

Coupe (2-door), Sedan (4-door)

Wheelbase:

107.5 inches (approx.)

Length:

196.7 inches (approx.)

Width:

70.3 inches (approx.)

Height:

55.2 inches (approx.)

Curb Weight:

3200 - 3400 lbs (approx., depending on trim and engine)

🛡️ Safety Features

NHTSA Side Impact Rating:

Not directly available for 1991 models through modern standards, but early W-body designs focused on occupant protection.

Brakes Front:

Vented Discs

Brakes Rear:

Drums

Airbags:

Driver-side airbag standard on some later 1991 models, but not universally present across all trims.

Seatbelts:

Front and rear seat belts with shoulder belts

💡 Technology Features

Audio System:

Factory AM/FM stereo with cassette player; optional CD player available on higher trims.

Cruise Control:

Available

Antennas:

Power antenna on select models.

🔧 Maintenance

Oil Change Interval:

Every 3,000 miles or 3 months, whichever comes first (using conventional oil).

Transmission Fluid Change:

Every 30,000-60,000 miles (depending on driving conditions and fluid type).

Coolant Flush:

Every 2 years or 30,000 miles.

Engine Oil Type:

API SG or SH, SAE 5W-30 (or 10W-30 in warmer climates)

Engine Oil Capacity:

4.5 quarts (4.3 L) with filter (3.1L V6), 4.5 quarts (4.3 L) with filter (3.8L V6)

Transmission Fluid Type:

Dexron-III (or equivalent)

Transmission Fluid Capacity:

8.5 - 9.5 quarts (8.0 - 9.0 L) (4T60/4T60-E)

Coolant Type:

GM Type 1 antifreeze/coolant (or equivalent)

Coolant Capacity:

14.0 - 15.0 quarts (13.3 - 14.2 L)

Common Problems:

Head gasket leaks (especially on older 3.1L engines), transmission solenoid issues (4T60-E), power steering pump leaks, aging electrical connectors, heater core leaks.

📚 Vehicle History

Buick Legacy:

Buick has a long history of producing comfortable, refined, and stylish American automobiles, often positioned as a premium marque within General Motors.

Regal Lineage:

The Regal has been a staple in Buick's lineup since 1973, evolving through various platforms and design philosophies to cater to the mid-size market. The 1991 model is part of the third generation, based on the GM W-body platform.

Platform Introduction:

The W-body platform was introduced for the 1988 model year, representing a shift towards more aerodynamic and fuel-efficient designs for GM's mid-size cars.

🏆 Awards & Recognition

Industry Accolades:

While specific awards for the 1991 Regal are not prominently documented, Buick models of this era were generally praised for their comfortable ride and spacious interiors, competing well within the American mid-size sedan and coupe market.