🏷️ Basic Information Identification Make: Isuzu Model: Trooper Year: 1991 Codes Chassis Code: UBS/WS 👋 Introduction Market Position Segment: Compact/Mid-size SUV (Sport Utility Vehicle) Competitive Analysis Key Competitors: Jeep Cherokee, Toyota 4Runner, Nissan Pathfinder, Ford Bronco II, Mitsubishi Montero Key Features Unique Selling Points: Rugged body-on-frame construction, capable 4WD system, spacious interior for its class, reliable Isuzu diesel engine options (in many markets) Target Audience Users: DIY enthusiasts, professional mechanics, owners seeking to maintain and repair their vehicle 📋 Manual Details Coverage Areas Covered Regions: Global (factory original specifications apply) Page Count Estimated Pages: Hundreds (specific count not provided, but described as extensive) Manual Type Type: Workshop Service Repair Manual (Full Factory) Language Language: English Format Format: PDF (Downloadable) 📖 Manual Coverage Systems Covered Powertrain: Engine mechanical, engine electrical, fuel system, exhaust system, cooling system, lubrication system Drivetrain: Transmission (manual and automatic), transfer case, drive shafts, axles, differentials Suspension Steering: Front suspension, rear suspension, steering system, power steering Brakes: Brake system components, hydraulic lines, parking brake, ABS (if equipped) Electrical: Lighting system, ignition system, starting system, charging system, instrument panel, power windows, power locks, audio system, wiring diagrams Body Chassis: Body construction, interior trim, exterior trim, bumpers, doors, hood, tailgate, glass Procedures Included Maintenance: Scheduled maintenance, fluid changes, filter replacements, lubrication Repair: Engine rebuild, transmission overhaul, brake caliper replacement, suspension component replacement, electrical component repair Troubleshooting: Diagnostic procedures for common and complex faults across all systems, including electrical diagnostics Specifications: Torque specifications, clearances, fluid capacities, pressures, electrical resistance values Technical Depth Depth: Complete disassembly and reassembly of all major vehicle components, detailed diagnostic trees, in-depth electrical troubleshooting 📊 Manual Specifications File Format Format: PDF Print Quality Printability: Printable without restriction (full or partial) Binding Type Binding: Digital (Downloadable PDF) Paper Type Physical Medium: N/A (Digital delivery) Software Requirements Reader: Adobe PDF Reader ⚙️ Engine Specifications Primary Engine Engine Type 1: 2.6L (2559cc) SOHC Inline-4 Petrol Engine Code 1: 4ZE1 Power Hp 1: Approx. 120 hp @ 5000 rpm (US Spec) Torque Lb-Ft 1: Approx. 140 lb-ft @ 2800 rpm (US Spec) Optional Engine Engine Type 2: 2.8L (2826cc) Naturally Aspirated Diesel Inline-4 (Turbocharged in some markets) Engine Code 2: 4JB1-T (Turbocharged Diesel) Fuel System Fuel Delivery: Fuel Injection (MPI for Petrol) Performance Compression Ratio Petrol: 8.6:1 (Approx.) 🔧 Transmission Standard Transmission Type 1: 5-Speed Manual Optional Transmission Type 2: 4-Speed Automatic Features Drivetrain Options: 2WD (Rear Wheel Drive), 4WD (Part-time with 2-speed transfer case) Fluid Specifications Manual Transmission Fluid: API GL-4, SAE 75W-90 (Consult manual for exact specs and capacity) Automatic Transmission Fluid: Dexron III / MERCON compatible (Consult manual for exact specs and capacity) 📐 Dimensions Exterior Wheelbase: 2760 mm (108.7 in) Length: 4560 mm (179.5 in) Width: 1735 mm (68.3 in) Height: 1670 mm (65.7 in) (Approx., varies with trim) Weights Curb Weight: 1700-1900 kg (Approx., varies with configuration) Towing Capacity: Up to 5000 lbs (Consult vehicle specific rating) 🛡️ Safety Features Ratings NHTSA Overall Rating 1991: Not explicitly rated by NHTSA in a comparable format to modern standards. Active Features ABS: Optional (Rear-wheel ABS common) Passive Features Airbags: Driver airbag standard on many models by 1991, passenger airbag optional or unavailable. Seatbelts: 3-point front seatbelts, 2-point rear lap belts (3-point rear optional/market dependent) 💡 Technology Features Infotainment Audio System: Factory AM/FM stereo with cassette player, optional CD player on higher trims. Driver Assistance Cruise Control: Optional Connectivity Power Features: Power windows, power door locks, power mirrors were available options on various trims. Climate Control HVAC: Manual air conditioning and heating standard on most models, automatic climate control not typical for this era. 🔧 Maintenance Service Intervals Oil Change Interval: Every 5,000 miles or 6 months (Consult manual for specific engine and oil type) Air Filter Replacement: Every 15,000 - 30,000 miles or annually (or as needed based on driving conditions) Spark Plug Replacement Petrol: Approx. 30,000 - 60,000 miles (Depending on spark plug type) Fluid Specifications Engine Oil Spec: API SG or SH, SAE 10W-30 or 10W-40 (Check manual for viscosity based on climate) Coolant Type: Ethylene Glycol based antifreeze (Green) with water, 50/50 mix (Consult manual for specific type and capacity) Brake Fluid Type: DOT 3 Known Issues Common Wear Items: Ball joints, tie rod ends, wheel bearings, exhaust system corrosion, fuel injectors (petrol), glow plugs (diesel), coolant leaks (heater core, hoses) Transfer Case Issues: Potential for wear in the transfer case shifting mechanism or chain slack. Rust Prone Areas: Fender wells, rocker panels, chassis frame (especially in areas with road salt). 📚 Vehicle History Brand Heritage Isuzu Origins: Founded in 1916, Isuzu Motors is a Japanese commercial vehicle and diesel engine manufacturer. Model Evolution First Generation Start: First generation (Isuzu Rodeo / Trooper) debuted in 1981 globally. Second Generation Introduction: The 1991 model year represents the introduction of the second generation Isuzu Trooper (UBS). Design...