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
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
Depth:
Factory-level detail, suitable for professional technicians and advanced DIYers
Crash Test Data:
As this is a 1991 model, specific NHTSA/IIHS ratings may not be readily available in modern databases. However, its B-body platform offered substantial structural integrity.
Braking:
Power-assisted front disc brakes, rear drum brakes. Optional Anti-lock Braking System (ABS).
Airbags:
Driver-side airbag standard, passenger airbag optional (often integrated into dash)
Seat Belts:
Front and rear seat belts, with shoulder belts in the front
Lighting:
Halogen headlamps, power side mirrors
Oil Change:
Typically every 3,000-5,000 miles or 3-6 months, depending on driving conditions. Refer to manual for specific guidance.
Transmission Fluid:
Change every 30,000-50,000 miles. Refer to manual for exact fluid type and capacity.
Coolant Flush:
Every 24,000-30,000 miles or 2-3 years.
Engine Oil:
API Service SG or SH, SAE 5W-30 or 10W-30 recommended (consult manual for precise viscosity based on temperature).
Transmission Fluid:
Dexron-III (or equivalent) Automatic Transmission Fluid (ATF).
Coolant:
Ethylene Glycol based, 50/50 mix with distilled water.
Fuel System:
TPI intake gaskets can sometimes leak, leading to vacuum leaks and rough idle. Fuel injectors can become clogged over time.
Suspension:
Worn ball joints, control arm bushings, and sway bar links are common due to the vehicle's weight and age.
Electrical:
Age-related degradation of wiring harnesses, sensor failures, and issues with the instrument cluster are possible.
Engine:
Head gasket leaks, especially on high-mileage examples, can occur. Lifter noise is also a possibility.
Buick Legacy:
Buick has a long-standing reputation for comfortable, luxurious, and well-built vehicles, especially with its Estate wagon models.
Roadmaster Lineage:
The Roadmaster nameplate has a history dating back to the 1930s. The 1991 model marked a significant revival of the nameplate, building upon the successful B-body platform previously used for wagons like the Chevrolet Caprice Estate and Oldsmobile Custom Cruiser.
Platform Usage:
This generation of Roadmaster Estate utilized GM's B-body platform, shared with other large GM sedans and wagons.
Manufacturing Location:
Likely assembled in the United States (e.g., Arlington, Texas; Baltimore, Maryland)
