🏷️ Basic Information Identification Make: Jeep Model: Cherokee Chassis Code: YJ (Wrangler), XJ (Cherokee) Year: 1991 Codes Manual Product Code Designation: Full Service Repair Manual 👋 Introduction Market Position Target User: Jeep Cherokee (XJ) and Wrangler (YJ) owners and independent repair shops Competitive Analysis Manual Advantage: Comprehensive coverage mirroring professional technician resources, saving costs on dealership service. Key Features Instructional Style: Step-by-step numbered instructions, detailed illustrations, notes, cautions, and warnings. Information Access: Numbered table of contents for quick information retrieval. 📋 Manual Details Coverage Areas Model Variants Covered: YJ (Wrangler) and XJ (Cherokee) Repair Scope: Repair, maintenance, rebuilding, refurbishing, and restoration of the Jeep Cherokee YJ XJ 1991. Page Count Estimated Page Count: Not specified, but described as 'very detailed' Manual Type Type: Full Service Repair Manual Language Language: English Format Digital Format: PDF Digital Delivery: Instant Download 📖 Manual Coverage Systems Covered Mechanical Systems: Engine, Transmission, Drivetrain, Suspension, Steering, Brakes, Cooling, Fuel, Exhaust, HVAC Electrical Systems: Wiring Diagrams, Lighting, Ignition, Starting, Charging, Instrumentation, Power Accessories, Diagnostics Body And Chassis: Body Panels, Interior Trim, Exterior Trim, Frame (where applicable) Procedures Included Maintenance Procedures: Scheduled Maintenance, Fluid Changes, Filter Replacements, Lubrication Repair Procedures: Engine Rebuilds, Transmission Overhauls, Suspension Component Replacement, Brake System Repairs, Electrical Component Diagnosis and Repair Diagnostic Procedures: Troubleshooting Guides, Symptom-to-Cause Analysis, Electrical System Diagnostics Troubleshooting Electrical: Detailed troubleshooting for all electrical systems, including power distribution, ignition, and accessories, supported by wiring diagrams. Technical Depth Diagnostic Capabilities: Advanced diagnostics for both mechanical and electrical systems Rebuild Scope: Comprehensive information for complete rebuilds of major components Audience Level: Suitable for Professional Technicians and DIY Mechanics Illustration Quality: Detailed illustrations, drawings, and photos designed to guide users through procedures. Enlarged insets for critical parts identification. 📊 Manual Specifications File Format File Type: PDF Software Requirements: Adobe PDF Reader, WinRAR Digital Storage: Can be saved to hard drive and burned to CD-ROM Print Quality Printability: Full Printable Binding Type Binding Method: N/A (Digital PDF) Paper Type Paper Quality: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Engine Options 1991 Xj: 4.0L (242 cu in) Inline-6 'High Output' (RPO: ERH), 2.5L (150 cu in) Inline-4 (RPO: ERH) Engine Options 1991 Yj: 4.0L (242 cu in) Inline-6 'High Output' (RPO: ERH), 2.5L (150 cu in) Inline-4 (RPO: ERH) Performance 4.0L Ho Torque Approx: 220-230 lb-ft @ 1750-2000 RPM 4.0L Ho Horsepower Approx: 177-182 hp @ 4750 RPM Fuel System Fuel Delivery: Multi-Port Fuel Injection (MPFI) Recommended Fuel: 87 Octane Unleaded Gasoline 🔧 Transmission Standard Xj Standard Transmission: 5-Speed Manual (AX-5 or NV1500) Yj Standard Transmission: 5-Speed Manual (AX-5 or NV1500) Optional Xj Optional Transmission: 3-Speed Automatic (AW-4) Yj Optional Transmission: 3-Speed Automatic (AW-4) Features Transfer Case Options: Command-Trac NV231 (part-time, 2WD high, 4WD high, 4WD low, Neutral) or Selec-Trac NP242 (full-time 4WD, 2WD high, 4WD high, 4WD low, Neutral) 📐 Dimensions Exterior Xj Wheelbase: 103.4 inches (2626 mm) Yj Wheelbase: 93.4 inches (2372 mm) Weights Xj Curb Weight Range: Approx. 3,200 - 3,700 lbs (1451 - 1678 kg) depending on configuration Yj Curb Weight Range: Approx. 2,900 - 3,400 lbs (1315 - 1542 kg) depending on configuration 🛡️ Safety Features Ratings NHTSA Crash Test Results 1991: Limited data available for this era, but generally considered robust for its class. The XJ received moderate ratings in front impact tests. The YJ, being a convertible, had different testing parameters. Active Features Standard Safety Features: Seat Belts, Four-Wheel Drive (for traction) Passive Features Rollover Protection: Internal roll cage structure for XJ, prominent windshield frame and sport bar for YJ. 💡 Technology Features Infotainment Audio System Options: Factory AM/FM radio, optional cassette player, and limited speaker configurations. Driver Assistance Driver Aids 1991: Basic safety systems, no electronic driver assistance features like ABS or traction control were standard on all models. Connectivity Connectivity Features 1991: N/A (No modern connectivity features like Bluetooth or USB) 🔧 Maintenance Service Intervals Engine Oil Change: Every 3,000 miles or 3 months, whichever comes first (typically for conventional oil) Transmission Fluid Change Auto: Every 30,000 - 50,000 miles (consult manual for exact spec) Transmission Fluid Change Manual: Every 50,000 - 75,000 miles (consult manual for exact spec) Fluid Specifications Engine Oil Type 4.0L: API SG or SH, SAE 10W-30 (or 5W-30 in extreme cold) Coolant Type: Ethylene Glycol based, typically a Green (Type A) or compatible universal coolant Brake Fluid Type: DOT 3 Known Issues Common Xj Yj Issues: Radiator leaks, head gasket issues (especially with 4.0L), exhaust manifold cracks (4.0L), rear main seal leaks, aging suspension bushings, fuel pump failure, rust on body and frame components. 📚 Vehicle History Brand Heritage Jeep Legacy: Rooted in robust off-road capability and rugged design, originating from military vehicles. Model Evolution Xj Generation: First generation Cherokee (XJ) introduced in 1984, known for its unibody construction and pioneering SUV design. The 1991 model year saw refinements and updates....