The 1990 Buick Reatta represents a sophisticated personal luxury coupe, engineered to offer a refined driving experience. As a two-seater front-wheel-drive vehicle, it was designed to appeal to a discerning buyer with its stylish aesthetics and a focus on driver-centric comfort. Powered by a 3.8L V6 engine paired with a 4-speed automatic transmission, the Reatta aimed to blend performance with the quiet, comfortable ride characteristic of its heritage. Key features include standard Anti-lock Braking System (ABS) and driver and passenger airbags, underscoring a commitment to safety for its era. This comprehensive factory service and repair manual provides detailed, A-Z coverage for all aspects of the 1990 Buick Reatta. It is meticulously organized to assist owners, mechanics, and technicians in performing scheduled maintenance, intricate diagnostics, and complete repairs. The manual covers all major systems, including the engine, fuel, cooling, ignition, transmission, brakes, steering, suspension, and electrical systems, with extensive wiring diagrams and troubleshooting guides. Its factory-level detail ensures accurate information for maintaining the vehicle's complex engineering and unique features. 🏷️ Basic Information Identification Make: Buick Model: Reatta Year: 1990 Codes Vin Prefix: 1G3 👋 Introduction Market Position Positioning: Premium personal luxury coupe, targeting a sophisticated buyer Competitive Analysis Competitors: Ford Thunderbird, Chevrolet Lumina Coupe (later models), Chrysler LeBaron Coupe Key Features Design: Two-seater, front-wheel-drive, retractable hardtop available (though not explicitly mentioned for 1990 in this manual's context, it was a defining Reatta feature) Manual Value Proposition: Provides OEM-level repair information, enabling owners to perform maintenance and repairs, saving costs and fostering self-sufficiency. 📋 Manual Details Coverage Areas Primary Coverage: Full vehicle service and repair Scope: All models and all repairs A-Z Page Count Estimated Page Count: Extensive (specific count not provided, but indicated as comprehensive) Manual Type Type: Factory Service and Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine: Detailed service, diagnosis, and repair Control System: Diagnosis and repair Mechanical: Comprehensive repair procedures Fuel System: Service specifications and repair Emission Control: Service and diagnosis Cooling System: Service and repair Lubrication System: Service specifications Ignition System: Service and repair Charging System: Diagnosis and repair Automatic Transmission: Service and repair Manual Transmission: Service and repair Drive Axle: Service and repair Suspension: Service and repair Wheel And Tire: Service and specifications Brake Control: Service and repair Brake System: Detailed service and repair Parking Brake: Service and repair Steering Column: Service and repair Power Steering: Service and repair Air Conditioning: Service and repair Supplemental Restraint System: Service and safety precautions Seat Belt System: Service and repair Engine Immobilizer: Diagnosis and repair Cruise Control: Service and repair Wiper And Washer: Service and repair Door Lock System: Service and repair Meter And Audio Visual: Service and repair Horn System: Service and repair Windshield Glass Mirror: Service and repair Instrument Panel: Service and repair Seat System: Service and repair Engine Hood Door: Service and repair Exterior Interior Trim: Service and repair Electrical System: Extensive diagrams and troubleshooting Multiplex Can Communication: Diagnosis and repair Procedures Included Maintenance: Scheduled maintenance procedures Diagnostics: Step-by-step diagnostic procedures for all systems Repair: Complete repair instructions for all components and systems Troubleshooting: Troubleshooting guides and fault finding charts Wiring Schematics: Complete and detailed wiring diagrams Technical Depth Depth: Factory-level detail, suitable for professional technicians and advanced DIYers Illustrations Quality: High-quality diagrams and illustrations 📊 Manual Specifications File Format Format: PDF Print Quality Printability: All pages printable Zoom Capability: Images can be blown up and printed enlarged Binding Type Binding: Digital (PDF) - No physical binding Paper Type Paper Type: N/A (Digital Format) Compatibility Operating Systems: Windows Vista (32/64), XP, ME, 98, NT, 2000, and Mac Requirements Software Requirements: Adobe PDF Reader and Winzip (free online) ⚙️ Engine Specifications Primary Engine Engine Type: 3.8L (3800 cc) V6 OHV Engine Code: L27 (likely for 1990) Performance Horsepower: 165 hp @ 4400 rpm (estimated for 1990 L27) Torque: 210 lb-ft @ 2800 rpm (estimated for 1990 L27) Fuel System Fuel Delivery: Sequential Port Fuel Injection (SFI) Fuel Type: Unleaded gasoline Cooling System Cooling Type: Liquid-cooled Ignition System Ignition Type: Distributorless Ignition System (DIS) or Distributor Ignition (DI) depending on exact L27 variant 🔧 Transmission Standard Type: 4-speed automatic overdrive Transmission Model: GM 4T60-E (likely) Optional Optional Transmission: None offered for 1990 Features Drive Layout: Front-wheel drive (FWD) 📐 Dimensions Exterior Length: 187.7 inches (approx.) Width: 70.3 inches (approx.) Height: 51.7 inches (approx.) Weights Curb Weight: 3,374 lbs (approx.) 🛡️ Safety Features Ratings NHTSA Driver Front Impact: Not specifically rated for 1990, but contemporary GM vehicles generally performed adequately. Active Features ABS: Anti-lock Braking System (ABS) standard Passive Features Airbags: Driver and passenger airbags standard Seat Belts: Front three-point seat belts with pretensioners 💡 Technology Features Infotainment Audio System: AM/FM stereo with cassette and optional CD player, analog and digital displays Driver Assistance Cruise Control: Standard feature Connectivity Multiplex System: Features...