Target User:
Jeep Cherokee (XJ) and Wrangler (YJ) owners and independent repair shops
Manual Advantage:
Comprehensive coverage mirroring professional technician resources, saving costs on dealership service.
Instructional Style:
Step-by-step numbered instructions, detailed illustrations, notes, cautions, and warnings.
Information Access:
Numbered table of contents for quick information retrieval.
Model Variants Covered:
YJ (Wrangler) and XJ (Cherokee)
Repair Scope:
Repair, maintenance, rebuilding, refurbishing, and restoration of the Jeep Cherokee YJ XJ 1991.
Estimated Page Count:
Not specified, but described as 'very detailed'
Type:
Full Service Repair Manual
Digital Delivery:
Instant Download
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)
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.
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.
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)
4.0L Ho Torque Approx:
220-230 lb-ft @ 1750-2000 RPM
4.0L Ho Horsepower Approx:
177-182 hp @ 4750 RPM
Fuel Delivery:
Multi-Port Fuel Injection (MPFI)
Recommended Fuel:
87 Octane Unleaded Gasoline
Xj Standard Transmission:
5-Speed Manual (AX-5 or NV1500)
Yj Standard Transmission:
5-Speed Manual (AX-5 or NV1500)
Xj Optional Transmission:
3-Speed Automatic (AW-4)
Yj Optional Transmission:
3-Speed Automatic (AW-4)
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)
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.
Standard Safety Features:
Seat Belts, Four-Wheel Drive (for traction)
Rollover Protection:
Internal roll cage structure for XJ, prominent windshield frame and sport bar for YJ.
Audio System Options:
Factory AM/FM radio, optional cassette player, and limited speaker configurations.
Driver Aids 1991:
Basic safety systems, no electronic driver assistance features like ABS or traction control were standard on all models.
Connectivity Features 1991:
N/A (No modern connectivity features like Bluetooth or USB)
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)
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
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.
Jeep Legacy:
Rooted in robust off-road capability and rugged design, originating from military vehicles.
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.
Yj Generation:
Second generation Wrangler (YJ) introduced in 1987, replacing the CJ series. Distinctive for its rectangular headlights and coil spring suspension.
Manufacturing Location 1991:
Toledo, Ohio, USA
