🏷️ Basic Information Identification Make: Ford Model: F-150 Year: 1991 Product Type: Repair Manual 👋 Introduction Market Position Vehicle Segment: Full-size pickup truck. Target Audience: Work trucks, fleet vehicles, personal use trucks known for durability and utility. Competitive Analysis Primary Competitors: Chevrolet C/K series (Silverado), Dodge Ram, GMC Sierra. Key Features Strengths: Robust construction, powerful engine options, capable of heavy hauling and towing, reliable powertrain. Model Highlight: The 1991 F-150 represents a significant evolution in Ford's light-duty truck line, building upon decades of heritage. 📋 Manual Details Coverage Areas Overall Scope: Comprehensive service and repair coverage for the 1991 Ford F-150 pickup truck. Page Count Estimated Pages: Varies by publisher, typically 500-1500 pages for a full factory service manual. Manual Type Type: Factory Service Manual (FSM) / Shop Manual Language Language: English Format Format: Printed physical book 📖 Manual Coverage Systems Covered Engine: 4.9L I6 (300 cu in), 5.0L V8 (302 cu in), 5.8L V8 (351 cu in Windsor) Transmission: Manual (4-speed, 5-speed), Automatic (E4OD, AOD, C6) Drivetrain: Rear-Wheel Drive (RWD), Four-Wheel Drive (4WD) including transfer case and front/rear axles Brakes: Front disc, rear drum; Anti-lock Braking System (ABS) if equipped Suspension: Front Twin-I-Beam independent suspension, Rear leaf spring solid axle Steering: Power-assisted recirculating ball Electrical: Charging system (alternator), Ignition system (distributor, electronic), Starting system (starter motor), Lighting, Instrumentation, Wiper/Washer system, Power accessories Fuel System: Electronic Fuel Injection (EFI) for all engines Cooling System: Radiator, fan, water pump, thermostat, coolant types Exhaust System: Catalytic converter, mufflers, pipes, sensors Body And Frame: Body panel repair, chassis lubrication, door mechanisms, cab/bed construction HVAC: Heating, Ventilation, and Air Conditioning (HVAC) system diagnosis and repair Procedures Included Maintenance: Oil changes, filter replacements, fluid checks and changes, lubrication, tune-ups, brake inspection and service, tire rotation. Diagnostics: Troubleshooting guides, symptom-based diagnostics, diagnostic trouble codes (DTCs) for EFI systems. Repair: Component removal, installation, and repair for all major systems including engine, transmission, brakes, suspension, steering, and electrical. Rebuilds: Detailed instructions for engine and transmission overhauls and rebuilds. Adjustments: Valve adjustments (where applicable), idle speed, brake adjustments. Wiring Diagrams: Complete electrical system wiring schematics for various configurations. Technical Depth Depth: Factory-level detail, suitable for professional technicians and advanced DIY enthusiasts. Diagnostic Tools: Information on using diagnostic tools like Ford's EEC-IV (Electronic Engine Control) diagnostic reader. Specifications: Torque specifications, clearances, fluid capacities, electrical resistance values, timing specifications. 📊 Manual Specifications File Format Digital Format Availability: Typically available as a printed manual; digital formats (PDF) may be sourced from third-party resellers or services. Print Quality Print Quality Typical: Good quality paper and printing for clarity of text and diagrams in original factory manuals. Binding Type Binding Type Typical: Hardcover or professional paperback binding. Paper Type Paper Type Typical: Durable, often glossy paper for diagrams and photos. ⚙️ Engine Specifications Primary Engine Engine 1 Displacement: 4.9 Liters (300 cubic inches) Engine 1 Configuration: Inline-6 (I6) Engine 1 Fuel System: Electronic Fuel Injection (EFI) Engine 1 Horsepower Est: 145-150 hp Engine 1 Torque Est: 240-255 lb-ft Optional Engine 1 Engine 2 Displacement: 5.0 Liters (302 cubic inches) Engine 2 Configuration: V8 Engine 2 Fuel System: Electronic Fuel Injection (EFI) Engine 2 Horsepower Est: 185-190 hp Engine 2 Torque Est: 270-280 lb-ft Optional Engine 2 Engine 3 Displacement: 5.8 Liters (351 cubic inches) Windsor Engine 3 Configuration: V8 Engine 3 Fuel System: Electronic Fuel Injection (EFI) Engine 3 Horsepower Est: 200-210 hp Engine 3 Torque Est: 300-310 lb-ft Performance Fuel Type: Unleaded gasoline Fuel System Injection Type: Sequential Electronic Fuel Injection (SEFI) for most configurations, some variations exist. Fuel Pump Type: In-tank electric fuel pump 🔧 Transmission Standard Manual Transmission Standard: 4-speed manual (e.g., NP435) on some base models. Optional Manual Transmission Optional: 5-speed manual (e.g., M5OD-R2) widely available. Automatic Transmission Option 1: AOD (Automatic Overdrive) 4-speed Automatic Transmission Option 2: E4OD (Electronic 4-speed Overdrive) on heavier duty models or with larger engines. Automatic Transmission Option 3: C6 3-speed automatic (less common on newer EFI models). Features Drivetrain Options: Rear-Wheel Drive (RWD) and Four-Wheel Drive (4WD). Transfer Case 4Wd: New Process (NP) 208 or BorgWarner 1345 manual shift transfer case. 📐 Dimensions Exterior Wheelbase Options: 116.8 inches (Regular Cab Short Bed), 133.0 inches (Regular Cab Long Bed, SuperCab Short Bed), 152.5 inches (Regular Cab XLWB, SuperCab Long Bed). Overall Length Est: 197.2 to 216.8 inches (depending on configuration). Overall Width Est: 79.0 inches. Overall Height Est: 74.7 inches. Cargo Bed Length Options: 6.5 ft (short bed) and 8.0 ft (long bed). Weights Curb Weight Est: Approx. 3,800 - 4,500 lbs (depending on configuration). Gvwr Est: 5,000 - 6,000+ lbs (depending on F-250/F-350 variants if applicable). Payload Capacity Est: 1,500 - 2,500+ lbs. Towing Capacity Est: Up to 7,000 - 7,500 lbs (properly equipped). 🛡️ Safety Features Ratings NHTSA Ratings 1991: Data for 1991 vehicles is often limited; focus on passive and active features....