The 1991 Buick Roadmaster Estate represents a premium, full-size luxury station wagon, built on the robust B-body platform. As a successor to iconic 'Woody' models, it offered a spacious, long-wheelbase design with rear-wheel drive and the option of distinctive woodgrain exterior trim. This vehicle was engineered for comfort and capability, powered by a substantial 5.7L V8 engine featuring Tuned Port Injection (TPI) or Central Sequential Fuel Injection (CSFI), delivering ample torque for towing and cruising. Its generous dimensions, including a 116-inch wheelbase and over 219 inches in length, provided exceptional interior and cargo space, positioning it as a strong contender against rivals like the Ford Country Squire and Mercury Grand Marquis Colony Park. This comprehensive service and repair manual provides detailed, factory-level information for all repairs and maintenance on the 1991 Buick Roadmaster Estate. It covers every aspect of the vehicle, from engine mechanicals, fuel, emission, cooling, lubrication, and ignition systems to the starting and charging system. In-depth guidance is also provided for the automatic transmission, driveshaft, differential, suspension, steering, and brake systems, including ABS. Furthermore, the manual details the electrical system, HVAC, and safety restraint systems, offering step-by-step diagnostic procedures, maintenance schedules, fluid specifications, and complete repair instructions. This resource is invaluable for owners, mechanics, and technicians seeking to maintain, diagnose, and repair this classic vehicle with precision and accuracy. 🏷️ Basic Information Identification Make: Buick Model: Roadmaster Estate Year: 1991 Codes Platform Code: B-body 👋 Introduction Market Position Positioning: Premium, full-size luxury station wagon; successor to the highly regarded 'Woody' models Competitive Analysis Competitors: Ford Country Squire, Mercury Grand Marquis Colony Park Key Features Body Style: Long-wheelbase, rear-wheel-drive station wagon with optional woodgrain exterior trim Engine Offering: Known for its powerful V8 engine, providing strong towing and cruising capabilities 📋 Manual Details Coverage Areas Primary Coverage: All models and all repairs A-Z for the 1991 Buick Roadmaster Estate Page Count Estimated Page Count: High (typically 1000+ pages for factory service manuals of this era) Manual Type Type: Factory Service and Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Mechanical: Detailed coverage of engine disassembly, assembly, diagnosis, and repair Engine Control System: Diagnosis and repair of the engine control module (ECM), sensors, actuators, and associated wiring Fuel System: Fuel injection system, fuel pump, injectors, fuel pressure regulator, and service specifications Emission Control: EGR system, catalytic converter, evaporative emission control (EVAP), and emission-related diagnostics Cooling System: Radiator, water pump, thermostat, cooling fan, and coolant specifications Lubrication System: Oil pump, oil filter, oil pressure, and lubrication specifications Ignition System: Spark plugs, ignition coils, distributor (if applicable), timing, and ignition system diagnostics Starting Charging System: Starter motor, alternator, battery, and charging system diagnostics Automatic Transmission: Detailed overhaul, diagnosis, and service procedures for the automatic transmission Manual Transmission: Coverage for manual transmission (if equipped) including disassembly, assembly, and repair Driveshaft Driveline: U-joints, driveshaft, and related components Differential Axles: Rear axle, differential, and axle shafts Suspension System: Front and rear suspension components, alignment specifications, and repair procedures Steering System: Steering column, power steering pump, steering gear/rack, and tie rods Brake System: Front and rear brakes, hydraulic system, ABS (if equipped), parking brake, and service Wheel Tire Assembly: Tire pressure, wheel specifications, and lug nut torque Climate Control HVAC: Air conditioning system, heater core, blower motor, and controls Safety Restraint System: Airbag system (SRS) and seat belt operation and service Electrical System: Comprehensive coverage of all vehicle electrical components and circuits Wiring Schematics: Detailed wiring diagrams for all vehicle systems Procedures Included Maintenance: Scheduled maintenance, fluid changes, filter replacements, and inspections Diagnostics: Step-by-step diagnostic procedures for all major systems, including troubleshooting guides Repair: Complete repair instructions for virtually every component of the vehicle Rebuilds: Detailed procedures for rebuilding major components like engines and transmissions Installation: Instructions for installing replacement parts and accessories Technical Depth Depth: Factory-level detail, suitable for professional technicians and advanced DIYers 📊 Manual Specifications File Format File Type: PDF Searchability: Likely searchable text content within the PDF Print Quality Printability: Fully printable, allowing users to print specific pages or sections Image Resolution: High enough to allow for blowing up images and printing enlarged copies Binding Type Binding: N/A (Digital PDF format) Paper Type Paper Type: N/A (Digital PDF format) ⚙️ Engine Specifications Primary Engine Engine Code: L05 (LT1 variant for 1991) Engine Type: 5.7L V8 (350 ci) Tuned Port Injection (TPI) or Central Sequential Fuel Injection (CSFI) Performance Horsepower: Approximately 170-180 hp (specific rating may vary slightly by year and exact configuration) Torque: Approximately 300-315 lb-ft (specific rating may vary slightly) Fuel System Injection Type: Tuned Port Injection (TPI) or Central Sequential Fuel Injection (CSFI) Fuel Type: Unleaded gasoline 🔧 Transmission Standard Transmission Type: 4-speed Automatic (4L60/TH700-R4) Optional Transmission Type: N/A (Automatic was standard) Features Overdrive: Yes (4th gear overdrive) 📐 Dimensions Exterior Wheelbase: 116.0...