Positioning:
Mid-size sedan targeting families and commuters, emphasis on comfort and value.
Competitors:
Ford Taurus, Chevrolet Lumina, Dodge Aries/Spirit.
Features:
Comfortable ride, spacious interior for its class, front-wheel drive.
Advantage:
Official licensing and OE data derivation ensures accuracy and completeness over unofficial guides.
Coverage:
Comprehensive service and repair for 1990 Buick Century
Type:
Service and Repair Manual Software
Format:
Digital Download (PDF-like access via web browser)
Page Count:
Full factory-derived content (estimated 1000+ pages equivalent)
Engine:
3.1L V6 (RPO LHO), 2.5L 4-Cylinder (RPO LBO)
Engine Management:
ECM diagnostics, fuel injection, ignition system, emissions control
Transmission:
3-speed Turbo-Hydra-Matic 125C automatic transmission
Drivetrain:
Front-wheel drive, transaxle, CV joints, axle shafts
Brakes:
Front disc, rear drum, parking brake, ABS (if equipped)
Steering:
Power steering system, steering column, tie rods
Suspension:
Front MacPherson struts, rear independent suspension, shock absorbers, springs
Electrical:
Battery, charging system, starting system, lighting, instrumentation, body controls, power accessories
HVAC:
Heating, ventilation, and air conditioning system components and operation
Body And Chassis:
Body panel removal/installation, doors, windows, interior trim, frame structure
Maintenance:
Oil changes, filter replacements, fluid checks and top-offs, tune-ups
Troubleshooting:
Diagnostic procedures for common symptoms, wiring diagrams for fault tracing
Repair:
Component removal, disassembly, inspection, repair, and reassembly for all major systems
Diagnostics:
Step-by-step diagnostic routines, component testing procedures
Depth:
Factory-level detail, covering complete engine rebuilds to simple bulb replacement
Engine 1:
3.1L (189 ci) V6 (RPO LHO)
Engine 1 Configuration:
90-degree V6, Overhead Valves (OHV)
Engine 1 Horsepower:
140 hp @ 4800 rpm (approx.)
Engine 1 Torque:
170 lb-ft @ 3200 rpm (approx.)
Engine 2:
2.5L (151 ci) 4-Cylinder (RPO LBO)
Engine 2 Configuration:
Inline-4, Overhead Valves (OHV)
Engine 2 Horsepower:
110 hp @ 4800 rpm (approx.)
Engine 2 Torque:
135 lb-ft @ 2400 rpm (approx.)
Fuel Delivery:
Multi-Port Fuel Injection (MPFI)
Fuel Type:
Unleaded gasoline, 87 octane (87 AKI) minimum recommended
ECU Type:
GM ECM (Electronic Control Module)
NHTSA Driver Front Impact:
4-star (1990 model year testing)
NHTSA Passenger Front Impact:
4-star (1990 model year testing)
ABS:
Optional Anti-lock Braking System (ABS) on front wheels.
Airbags:
Driver-side airbag standard.
Seatbelts:
Front: Automatic shoulder belts. Rear: Lap and shoulder belts.
Oil Change Interval:
Every 3,000 miles or 3 months, whichever comes first (traditional interval for this era).
Transmission Fluid Change:
Check every 15,000 miles, change/flush as needed or every 30,000-45,000 miles based on usage.
Coolant Change:
Initial fill, then every 2 years or 30,000 miles (for ethylene glycol based coolants).
Spark Plug Replacement:
Approx. 30,000 miles for standard plugs, potentially longer for platinum tipped if equipped.
Engine Oil:
SAE 10W-30 or 10W-40 API SG or higher.
Engine Coolant:
GM Spec 1825M (Green ethylene glycol type) or equivalent, 50/50 mixture with distilled water.
Brake Fluid:
DOT 3 brake fluid.
Common Problems:
Head gasket leaks (especially 3.1L V6), transmission solenoid failures, power window motor failures, HVAC blower motor resistor issues, exhaust manifold leaks.
Repair Focus:
The manual provides in-depth diagnostic and repair procedures for these common wear-and-tear items.
Brand Identity:
Buick positioned as GM's premium mainstream brand, known for comfort and quiet ride.
Generation:
Second Generation (1988-1996) GM W-body platform.
Production Years:
1982-1987 (first gen), 1988-1996 (second gen). 1990 is part of the second gen.
Platform Shared With:
Chevrolet Lumina, Oldsmobile Cutlass Supreme, Pontiac Grand Prix.
