🏷️ Basic Information Identification Make: Lexus Model: LS400 Year: 1991 Codes Chassis Code: XF10 👋 Introduction Market Position Vehicle Segment: Full-size Luxury Sedan Target Audience: Affluent consumers seeking refined comfort, advanced technology, and reliability. Competitive Analysis Key Competitors: Mercedes-Benz S-Class, BMW 7 Series, Cadillac DeVille, Lincoln Town Car Unique Selling Proposition: Exceptional build quality, quiet and smooth ride, innovative features for its time, and Lexus's commitment to customer service. Key Features Powertrain: Silky-smooth 4.0L V8 engine and responsive automatic transmission. Suspension: Advanced Electronic Modulated Suspension (EMS) offered adjustable ride height and damping. Cabin Comfort: Extremely quiet and well-insulated cabin, high-quality materials, supportive seating. Technology: Available premium sound system, automatic climate control, power adjustable features, and early adoption of ABS. 📋 Manual Details Coverage Areas Primary Coverage: Complete Service and Repair Secondary Coverage: Maintenance, Diagnostics, Troubleshooting, Wiring Diagrams, Specifications Page Count Estimated Page Count: 1500+ Manual Type Type: Factory Service Manual (FSM) Language Language: English Format Format: Digital Software (likely PDF or proprietary software) 📖 Manual Coverage Systems Covered Engine: 1UZ-FE 4.0L V8 (Naturally Aspirated) Fuel System: EFI (Electronic Fuel Injection), Fuel Pump, Injectors, Fuel Tank, Lines Ignition System: Electronic Ignition System, Spark Plugs, Coils Cooling System: Radiator, Water Pump, Thermostat, Hoses, Fan Exhaust System: Manifolds, Catalytic Converter, Muffler, Oxygen Sensors Transmission: A340E 4-Speed Automatic Transmission Drivetrain: Rear Wheel Drive (RWD), Driveshaft, Differential, Axles Suspension: Front Double Wishbone, Rear Multi-Link Independent Suspension, Electronic Modulated Suspension (EMS) Brakes: Front and Rear Ventilated Discs, ABS (Anti-lock Braking System) Steering: Power Assisted Rack and Pinion, Variable Assist Power Steering (VAPS) Electrical System: 12V Battery, Alternator, Starter Motor, Fuses, Relays Lighting: Headlights, Taillights, Interior Lighting, Fog Lamps (if equipped) Climate Control: Air Conditioning (A/C), Heater, Automatic Climate Control Body And Frame: Unibody Construction, Body Panels, Doors, Bumpers, Glass Interior: Seats, Upholstery, Dashboard, Trim, Power Accessories Safety Systems: Seat Belts, Airbags (Driver side only for this model year), ABS Wiring Diagrams: Comprehensive Electrical Schematics for all systems Procedures Included Maintenance: Oil Change, Filter Replacement, Fluid Checks and Changes, Spark Plug Replacement, Belt Inspection and Replacement Diagnostics: Troubleshooting Engine Performance, Electrical Faults, Transmission Issues, ABS Malfunctions Repair: Engine Overhaul, Transmission Rebuild, Brake System Repair, Suspension Component Replacement, Electrical Component Repair/Replacement Adjustment: Valve Clearance Adjustment, Throttle Body Adjustment, Steering Alignment Testing: Compression Testing, Fuel Pressure Testing, Electrical Circuit Testing Installation: Component Installation and Removal (e.g., Alternator, Starter, AC Compressor) Recalibration: Wheel Speed Sensor Calibration (for ABS) Technical Depth Depth: Expert Level - Covers complete disassembly, assembly, and troubleshooting for all major vehicle systems. Detail Level: Detailed step-by-step instructions with torque specifications, clearances, and diagnostic flowcharts. 📊 Manual Specifications File Format Digital Format: Likely PDF with searchable text and images, or a dedicated software application. Print Quality Image Quality: High resolution for clear diagrams and illustrations. Binding Type Binding: Not Applicable (Digital Software) Paper Type Paper Type: Not Applicable (Digital Software) Accessibility Searchability: Likely fully searchable by keyword, part number, or system. ⚙️ Engine Specifications Primary Engine Engine Code: 1UZ-FE Engine Type: DOHC 32-Valve V8 Displacement: 3969 cc (4.0 Liters) Bore X Stroke: 87.5 mm x 82.5 mm Compression Ratio: 10.0:1 Performance Horsepower: 228 hp @ 5200 rpm Torque: 260 lb-ft @ 4000 rpm Fuel System Fuel Delivery: Electronic Fuel Injection (EFI) Fuel Type: Unleaded Premium Gasoline (91 Octane or higher recommended) Lubrication Oil Capacity: 6.1 US Quarts (5.8 Liters) with filter change Recommended Oil Viscosity: SAE 5W-30 (API SG or higher) 🔧 Transmission Standard Type: A340E 4-Speed Automatic Optional Transmission Options: None (Standard for LS400) Features Shift Modes: Power/Normal Modes Fluid Type Transmission Fluid: Dexron IIE (or equivalent) Fluid Capacity Transmission Fluid Capacity: 7.8 US Quarts (7.4 Liters) 📐 Dimensions Exterior Length: 197.2 inches (5009 mm) Width: 70.5 inches (1791 mm) Height: 54.1 inches (1374 mm) Wheelbase: 112.2 inches (2850 mm) Weights Curb Weight: 3968 lbs (1800 kg) Gross Vehicle Weight Rating: 4872 lbs (2210 kg) 🛡️ Safety Features Ratings NHTSA Driver Side Frontal Impact: Not explicitly rated by NHTSA in modern terms; considered very safe for its era. Active Features ABS: Standard Anti-lock Braking System (ABS) Traction Control: Not available on 1991 models. Passive Features Airbags: Driver-side airbag standard. Seatbelts: Front 3-point ELR (Emergency Locking Retractor) seat belts with pre-tensioners, rear 3-point seat belts. Body Structure: Reinforced safety cell construction. 💡 Technology Features Infotainment Audio System: Available premium ETR (Electronically Tuned Receiver) AM/FM stereo with cassette, and optional CD player. Many models featured Nakamichi or JBL sound systems. Display: Analog gauges with digital odometer and trip computer. Climate control often featured a digital display. Driver Assistance Cruise Control: Standard electronic cruise control. Parking Assistance: Rear parking sensors were not standard equipment on this model year. Connectivity Connectivity Features: No integrated Bluetooth or mobile connectivity. Primarily focused on the vehicle's internal systems. Comfort Features Power Features: Power windows, power door locks, power adjustable steering column (tilt/telescopic), power driver...