🏷️ Basic Information Identification Make: Jeep Model: Wrangler YJ Model Generation: First Generation YJ Codes Chassis Code: YJ 👋 Introduction Market Position Market Position: The Jeep YJ Wrangler, produced from 1987 to 1995, represented a significant shift from its CJ predecessors, introducing more modern amenities and passenger comfort while retaining its iconic off-road capability. This FSM is essential for owners and mechanics seeking in-depth knowledge to maintain and repair these rugged vehicles. Competitive Analysis Competitive Analysis: The YJ competed primarily against vehicles like the Ford Bronco II and Chevrolet S-10 Blazer in the compact SUV segment, but its rugged, body-on-frame construction and solid axle heritage positioned it distinctly towards off-road enthusiasts, a niche it dominated. Key Features Key Features: Rectangular headlights (a defining visual change from the CJ), coil springs in the rear (initially, though many YJs retained leaf springs in the rear depending on the specific configuration and year), and the introduction of the more powerful 4.0L inline-six engine. 📋 Manual Details Coverage Areas Applicable Model Years: 1987-1995 Engine Coverage: 2.5L AMC I4, 4.0L AMC I6 Transmission Coverage: AX4 (4-speed Auto), AX5 (5-speed Manual), AX15 (5-speed Manual), AW4 (4-speed Auto) Page Count Estimated Page Count: ~700-900 Manual Type Manual Type: Factory Service Manual (FSM) / Shop Manual Language Language: English Format Format: Digital (PDF) 📖 Manual Coverage Systems Covered Electrical System: Complete wiring diagrams, component locations, troubleshooting guides for all electrical circuits including lighting, ignition, fuel injection, starting/charging, instruments, accessories, HVAC, power windows/locks (if equipped). Engine Mechanical: Detailed engine overhaul procedures, component specifications, timing procedures, lubrication system, cooling system, and emission control systems for both 2.5L and 4.0L engines. Fuel System: Fuel delivery, fuel injection system (Renix and Chrysler), fuel pump, injectors, fuel pressure testing, and evaporative emission control. Drivetrain: Front and rear axle service (Dana 30/35), transfer case (NP231), driveshafts, universal joints, and differential service. Clutch system for manual transmissions. Suspension Steering: Front and rear suspension component service (leaf springs, shocks, sway bars), steering gear, power steering system, and alignment specifications. Brakes: Front disc and rear drum brake system overhaul, ABS troubleshooting (if equipped), parking brake system, and hydraulic system components. Body Chassis: Body panel removal/installation, door/hood/tailgate mechanisms, interior trim, frame specifications, and rust prevention measures. HVAC: Air conditioning system service, heater core replacement, blower motor, and control mechanisms. Procedures Included Troubleshooting: Detailed diagnostic flowcharts and procedures for common issues, including no-start conditions, poor performance, electrical faults, and braking problems. Repair Procedures: Step-by-step repair instructions for virtually every component and system, from minor adjustments to major overhauls. Maintenance: Scheduled maintenance tasks, fluid level checks, filter replacement, and general upkeep recommendations. Diagnostics: Diagnostic procedures for engine management systems (OBD-I), transmission control, and ABS. Technical Depth Technical Depth: Comprehensive diagnostic and repair information suitable for professional mechanics and advanced DIY enthusiasts. Includes torque specifications, clearances, and alignment data. 📊 Manual Specifications File Format File Format: PDF (Searchable text and image-based) Print Quality Print Quality: High-resolution scans of original factory documentation, ensuring clarity of diagrams and text. Binding Type Binding Type: N/A (Digital Format) Paper Type Paper Type: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Options: 2.5L AMC 'Tech IV' I4, 4.0L AMC I6 'Power-Tech' Performance 2.5L I4 Horsepower: 121 hp @ 4800 rpm (approx.) 2.5L I4 Torque: 170 lb-ft @ 2400 rpm (approx.) 4.0L I6 Horsepower: 177 hp @ 4700 rpm (approx.) 4.0L I6 Torque: 220 lb-ft @ 3200 rpm (approx.) Fuel System Fuel System Type: Multi-point Fuel Injection (MPI) - Renix (early YJ) and Chrysler (later YJ) Recommended Fuel: 87 Octane Unleaded Gasoline 🔧 Transmission Standard Standard Transmission: AX5 5-Speed Manual Transmission Optional Optional Transmission: AX4 4-Speed Automatic, AW4 4-Speed Automatic (with 4.0L engine), AX15 5-Speed Manual (with 4.0L engine) Features Transfer Case: New Process NP231 Command-Trac (2WD High, 4WD High, Neutral, 4WD Low) Manual Transmission Fluid: AX5/AX15: SAE 75W-90 Gear Oil (API GL-5) Automatic Transmission Fluid: AX4/AW4: ATF+3 or equivalent 📐 Dimensions Exterior Wheelbase: 93.4 inches (2372 mm) Length: 150.0 - 152.1 inches (3810 - 3863 mm) (depending on bumper style) Width: 69.3 inches (1760 mm) Height: 65.7 - 68.9 inches (1669 - 1750 mm) (depending on top and suspension) Weights Curb Weight: 3,000 - 3,300 lbs (1360 - 1497 kg) Gross Vehicle Weight Rating Gvwr: 4,500 - 4,800 lbs (2041 - 2177 kg) 🛡️ Safety Features Ratings NHTSA Rollover Rating 2Wd: 3/5 Stars (1997 Model Year - representative of YJ era design) NHTSA Rollover Rating 4Wd: 3/5 Stars (1997 Model Year - representative of YJ era design) Active Features Active Safety Features: Optional ABS (Anti-lock Braking System) on some later models. Passive Features Passive Safety Features: Seat belts (lap and shoulder belts in front, lap belts in rear), roll bar integrated into the windshield frame and rear structure. 💡 Technology Features Infotainment Infotainment Features: Basic AM/FM radio with cassette player (optional CD player on later...