🏷️ Basic Information Identification Make: Mercury Model: Topaz Year: 1991 Codes Platform: Ford Tempo/Mercury Topaz (First Generation, refreshed) 👋 Introduction Market Position Segment: Compact/Mid-size sedan and hatchback, aimed at value-conscious buyers. Competitive Analysis Competitors: Chevrolet Cavalier, Oldsmobile Achieva, Pontiac Grand Am, Dodge Shadow, Plymouth Sundance. Key Features Value Proposition: Affordable and reliable transportation with a focus on practical features. Manual Advantage: Provides authorized, OE-derived repair data for accurate and efficient maintenance and repair. 📋 Manual Details Coverage Areas Scope: Comprehensive service and repair information Manual Type Type: Service & Repair Manual Software Language Language: English Format Format: Online Software (Web-based access) Access Duration Duration: 1 Year Standard Access (Discounts for additional years) 📖 Manual Coverage Systems Covered Engine: Engine mechanical, engine performance, emissions control, cooling system, lubrication system, fuel system, starting and charging system Drivetrain: Manual transmission, automatic transmission (AXOD/AX4S), drive axles, clutch system Brakes: Front disc brakes, rear drum brakes, anti-lock braking system (ABS, if equipped) Steering Suspension: Power steering system, suspension components (struts, shocks, control arms), wheel alignment Electrical: Wiring diagrams, lighting system, ignition system, instrument cluster, power windows, power locks, cruise control, diagnostic connectors HVAC: Heating system, air conditioning system, ventilation Body Chassis: Body panels, doors, glass, interior trim, chassis components, exhaust system Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, fluid checks and changes, belt replacement, tune-ups Repair: Component removal and installation, major overhauls, diagnostic procedures, troubleshooting guides Diagnostics: Troubleshooting charts, symptom-based diagnostics, OBD-I diagnostic codes and procedures (for applicable systems) Technical Depth Depth: Factory-derived, in-depth repair and diagnostic information suitable for DIY and professional technicians 📊 Manual Specifications File Format Compatibility: PC, Laptop, Smartphone, Tablet (Requires web browser and internet connection) Print Quality Print Option: Digital format, printable sections (user-dependent) Binding Type Binding: N/A (Software) Paper Type Paper: N/A (Software) ⚙️ Engine Specifications Primary Engine Engine 1: 2.3L (140 cu in) OHC I4 (Pinto/Lima engine) Engine 1 Fuel System: Electronic Fuel Injection (EFI) Engine 1 Horsepower: Approx. 90-100 hp (varies by specific calibration) Engine 1 Torque: Approx. 120-130 lb-ft (varies by specific calibration) Optional Engine Engine 2: 2.3L (140 cu in) OHC I4 (High Output/Super-Charged) Engine 2 Fuel System: Electronic Fuel Injection (EFI) with Supercharger Engine 2 Horsepower: Approx. 120-130 hp (for supercharged model) Engine 2 Torque: Approx. 150-160 lb-ft (for supercharged model) Engine Oil Oil Type: API SG, SAE 5W-30 or 10W-30 (check manual for specific climate recommendations) Oil Capacity: Approx. 4.5 quarts (with filter change) 🔧 Transmission Standard Transmission Type: 5-speed Manual Transmission (MTX-II) Optional Transmission Type: 3-speed Automatic Transmission (AXOD, later AX4S) Features Automatic Transmission Fluid: MERCON Automatic Transmission Fluid Manual Transmission Fluid: Gear oil, SAE 75W-90 API GL-4 (verify with manual for specific MTX-II) 📐 Dimensions Exterior Wheelbase: Approx. 104.1 inches Length: Approx. 177.7 inches (sedan), 177.4 inches (hatchback) Weights Curb Weight: Approx. 2,600 - 2,900 lbs (depending on body style and options) Gross Vehicle Weight Rating: Approx. 3,700 - 3,900 lbs 🛡️ Safety Features Ratings NHTSA Frontal Impact Driver: Not explicitly rated or data unavailable for this specific year and model through readily accessible sources. Passive Features Seatbelts: Front: Three-point shoulder belts. Rear: Lap belts (three-point available on some models/trims). Airbags: Driver-side airbag became standard equipment in 1990 for this platform. Passenger airbag was not commonly available for this model year. 💡 Technology Features Infotainment Audio System: Factory AM/FM stereo with cassette tape player. Optional premium sound systems were available. Cruise Control: Optional feature on many trims. Driver Assistance ABS: Anti-lock braking system available as an option on some models. Connectivity Connectivity Features: No integrated Bluetooth or advanced connectivity features typical of modern vehicles. Analog communication systems. 🔧 Maintenance Service Intervals Oil Change: Every 5,000 - 7,500 miles or 6-12 months, whichever comes first (synthetic oil may extend intervals). Air Filter: Every 15,000 - 30,000 miles or as needed based on driving conditions. Spark Plugs: Every 30,000 - 60,000 miles (depending on spark plug type, e.g., copper vs. platinum). Coolant Flush: Every 30,000 - 60,000 miles or 2-4 years. Fluid Specifications Brake Fluid: DOT 3 Motor Vehicle Brake Fluid. Power Steering Fluid: Mercon ATF or specific Ford power steering fluid. Coolant: Ford SuperCoolant (Orange) or equivalent ethylene glycol-based coolant, mixed 50/50 with distilled water. Known Issues Engine: Potential for head gasket leaks, valve stem seal wear, and cooling system component failures (radiator, water pump, thermostat). Transmission: AXOD/AX4S automatic transmissions can be prone to internal wear and torque converter issues. Manual transmissions are generally robust but clutch wear is typical. Electrical: Corrosion in electrical connectors, failing alternator, and dashboard warning light malfunctions. Suspension: Worn control arm bushings, strut mount bearings, and tie rod ends are common wear items. 📚 Vehicle History Brand Heritage Manufacturer: Mercury, a division of Ford Motor Company, established to occupy a mid-tier market position. Model Evolution Platform Origin: Based on Ford's front-wheel-drive FN9 platform, shared with...