🏷️ Basic Information

Make:

Buick

Model:

Reatta

Year:

1991

Platform Code:

GM29

👋 Introduction

Vehicle Segment:

Personal luxury coupe, positioned as a sporty and stylish offering from Buick.

Key Competitors:

Ford Thunderbird, Mercury Cougar, Chevrolet Camaro, Pontiac Firebird, Chrysler LeBaron Coupe.

Design Philosophy:

Sleek, aerodynamic styling, driver-focused cockpit, and premium interior appointments, emphasizing a European-inspired design aesthetic.

Unique Selling Points:

Power-retractable hardtop convertible option, extensive use of plastic body panels for weight reduction and dent resistance, advanced (for its time) electronic features.

📋 Manual Details

Manual Coverage Scope:

Complete Workshop Service Repair Manual covering all aspects of vehicle service and repair.

Estimated Page Count:

Approximately 1200-1500 pages (typical for a comprehensive GM service manual of this era).

Manual Format Type:

Downloadable Workshop Service Repair Manual.

Language:

English

Digital Format:

PDF (Portable Document Format), compatible with PC, MAC, tablets, and smartphones.

Document Quality:

High quality, sharp text and clear, detailed illustrations and diagrams.

Digital Binding:

N/A (Downloadable PDF format allows for printing of individual chapters or the entire document).

Digital Paper Type:

N/A (Digital format, user can choose paper type for printing).

📖 Manual Coverage

Powertrain:

Engine (3.8L V6), transmission (automatic), fuel system, exhaust system, cooling system, lubrication system.

Chassis:

Suspension (front and rear), steering system, brakes (front disc, rear disc, ABS), wheels, tires.

Electrical:

Wiring diagrams, battery, charging system, starting system, lighting, instrumentation, body control modules, power accessories, anti-theft system.

Body:

Body structure, exterior trim, interior trim, doors, windows (including power windows and convertible top if applicable), seats, climate control system, airbags.

Body Control Module:

Coverage of the Body Control Module (BCM) and related functions (e.g., power locks, windows, mirrors).

Maintenance:

Scheduled maintenance, oil changes, filter replacements, fluid checks and top-offs, tune-ups, lubrication.

Repair:

Engine overhaul, transmission repair, brake caliper replacement, suspension component replacement, electrical diagnostics and repair, body panel repair.

Diagnostics:

Troubleshooting guides, diagnostic trouble codes (DTCs) for OBD-I system, symptom-based troubleshooting.

Installation Replacement:

Component removal and installation, accessory installation, interior and exterior trim replacement.

Torque Specifications:

Detailed torque specifications for all fasteners, crucial for engine, transmission, and chassis assembly.

Diagnostic Capabilities:

Advanced diagnostics, including flowcharts, schematics, and specifications for diagnosing complex issues.

Rebuild Procedures:

Detailed rebuild instructions for major components like the engine and transmission, including torque specifications and clearances.

Wiring Diagrams:

Comprehensive, section-specific wiring diagrams for all electrical systems.

📊 Manual Specifications

PDF Searchability:

Likely OCR'd text, allowing for keyword searching within the document.

Illustration Clarity:

Diagrams and illustrations are typically clear and detailed, essential for complex repair procedures.

Digital Access:

Instant email delivery allows for immediate access upon purchase.

⚙️ Engine Specifications

Engine Code:

3800 Series I (L27)

Displacement:

3.8 Liters (231 cubic inches)

Configuration:

Naturally Aspirated V6

Horsepower:

170 hp @ 4800 rpm

Torque:

220 lb-ft @ 2400 rpm

Fuel Delivery:

Multi-Port Fuel Injection (MPFI)

Fuel Type:

Unleaded Gasoline (87 octane recommended)

Coolant Capacity:

Approximately 13.2 quarts (12.5 liters) with heater.

Oil Capacity:

Approximately 4.5 quarts (4.3 liters) with filter change.

Recommended Oil Viscosity:

SAE 5W-30 (API Service SG or SH)

🔧 Transmission

Transmission Type:

4-speed automatic overdrive (4T60-E)

Optional Transmission Type:

N/A (Only automatic offered)

Transmission Control:

Electronic control with torque converter lock-up in higher gears.

Transmission Fluid Type:

Dexron-III (or equivalent) automatic transmission fluid.

Transmission Fluid Capacity:

Approximately 9.5 quarts (9.0 liters) for initial fill, check dipstick for correct level.

📐 Dimensions

Length:

187.6 inches (4765 mm)

Width:

70.2 inches (1783 mm)

Height:

52.6 inches (1336 mm)

Wheelbase:

104.1 inches (2644 mm)

Curb Weight:

Approximately 3300 - 3500 lbs (1497 - 1588 kg), varies by configuration.

🛡️ Safety Features

NHTSA Crash Test Ratings:

Specific NHTSA ratings for 1991 are not readily available in a consolidated format, but the Reatta was designed with safety in mind for its era.

Anti Lock Brakes:

Standard Anti-lock Braking System (ABS) on all models.

Airbags:

Driver-side airbag as standard equipment.

Seatbelts:

Three-point automatic front seat belts and rear lap belts.

💡 Technology Features

Audio System:

Premium AM/FM stereo with cassette player and optional CD player. Many models featured steering wheel-mounted audio controls.

Climate Control:

Automatic climate control with electronic adjustments was a prominent feature.

Cruise Control:

Standard cruise control.

Trip Computer:

Optional trip computer with various vehicle status readouts.

OBD System:

OBD-I (On-Board Diagnostics - First Generation) compliant.

🔧 Maintenance

Oil Change Interval:

Every 5,000 miles or 6 months, whichever comes first (under normal driving conditions).

Transmission Fluid Service:

Inspect fluid every 30,000 miles. Replace fluid and filter every 60,000 miles or as specified in the manual.

Coolant Replacement:

Flush and replace coolant every 60,000 miles or 4 years.

Spark Plug Replacement:

Platinum-tipped spark plugs typically last up to 100,000 miles, but checking and proper gap is essential.

Brake Fluid Type:

DOT 3 brake fluid.

Power Steering Fluid:

Dexron-III (or equivalent) automatic transmission fluid.

Common Reatta Problems:

Early models experienced issues with the power window regulators, suspension bushings, and some electronic components. The plastic body panels could also be prone to minor cracking or degradation over time if exposed to harsh conditions. ABS sensor issues were also reported.

Engine Issues:

The 3800 V6 is generally robust, but intake manifold gaskets could develop leaks. Spark plug wires can degrade over time.

Electrical Issues:

Concerns with the early electronic climate control systems and various sensors can arise. Wiring harnesses can also degrade.

📚 Vehicle History

Buick Legacy:

Buick, a division of General Motors, has a long history of producing upscale and comfortable American vehicles, often bridging the gap between mainstream and luxury segments.

Reatta Introduction:

The Reatta was introduced for the 1988 model year as a 1989 model. It was designed as a two-seater personal luxury coupe with a focus on sporty styling and a premium feel.

1991 Updates:

The 1991 model year saw minor revisions, continuing the established design and powertrain. The convertible option was introduced in 1990.

Production Plant:

Lansing Car Assembly Plant, Lansing, Michigan.

Production Period:

1989-1991.

🏆 Awards & Recognition

Car And Driver Best Cars:

While not winning major awards, the Reatta was often praised for its styling and comfortable ride by contemporary automotive journalists.