Introduction
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Market Position
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Positioning:
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Premium, factory-authorized service information for 1988 Jeep XJ platform vehicles and related models.
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Competitive Analysis
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Advantage:
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Authentic factory content, extensive coverage, dual inclusion of AW4 manual, high page count, cost-effective alternative to dealership labor.
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Key Features
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Content Quality:
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Step-by-step procedures, detailed illustrations, diagnostic flowcharts, accurate technical data.
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Usability:
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Printable on demand, searchable text, accessible on PC/Mac with Adobe Acrobat Reader.
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Value Proposition:
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Empowers owners to perform maintenance and repairs, saving significant labor costs.
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Manual Coverage
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Systems Covered
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Engine:
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2.5L AMC I4, 4.0L AMC I6
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Transmission:
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Manual (AX-4, AX-5), Automatic (AW4)
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Drivetrain:
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Front Axle, Rear Axle, Transfer Case (Command-Trac, Selec-Trac)
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Suspension:
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Front Leaf Spring, Rear Leaf Spring, Steering System
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Brakes:
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Front Disc, Rear Drum, Parking Brake
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Electrical System:
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Battery, Starting, Charging, Ignition, Lighting, Gauges, Accessories
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Fuel System:
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Fuel Injection (MPI) for 4.0L, Carburetor (Weber 32/36 DFEV) for 2.5L
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Cooling System:
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Radiator, Fan, Water Pump, Thermostat
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Exhaust System:
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Manifold, Catalytic Converter, Muffler, Pipes
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Body And Frame:
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Frame, Bumpers, Doors, Panels, Glass, Upholstery
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Heating And Air Conditioning:
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HVAC System Components, Operation, and Service
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Emission Control:
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EGR System, PCV System, Catalytic Converter Operation
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Restraint Systems:
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Seat Belts, Passive Restraint Systems (if applicable)
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Instrumentation:
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Instrument Panel Systems, Gauges, Warning Lamps
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Accessories:
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Audio Systems, Horn, Speed Control, Wipers, Lamps
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Procedures Included
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Maintenance:
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Lubrication, Fluid Changes, Filter Replacements, Tune-ups
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Diagnostics:
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Troubleshooting Guides, Symptom-Based Diagnostics, Diagnostic Trouble Codes (DTCs) if applicable
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Repair:
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Component Replacement, System Overhauls, Reassembly Instructions
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Adjustment:
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Brake Adjustment, Clutch Adjustment, Carburetor/EFI Adjustment
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Installation:
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Component Installation and Setup
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Rebuilds:
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Engine, Transmission, Transfer Case, Differential Rebuilds (detailed steps)
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Technical Depth
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Depth:
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Comprehensive Factory Level - Suitable for professional mechanics and advanced DIY enthusiasts
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Illustrations:
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Photos, Exploded Views, Diagrams, Wiring Schematics
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Maintenance
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Service Intervals
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Oil Change Interval:
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Every 3,000 miles (4,800 km) or 3 months, whichever comes first (typical for this era).
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Transmission Fluid Change Interval:
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Every 30,000 miles (48,000 km) or 24 months for automatic transmission.
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Coolant Change Interval:
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Every 30,000 miles (48,000 km) or 24 months.
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Fluid Specifications
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Engine Oil Type I4:
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API SG, SAE 10W-30 or 10W-40
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Engine Oil Type I6:
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API SG, SAE 10W-30
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Engine Coolant:
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Ethylene Glycol based, 50/50 mix with distilled water
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Power Steering Fluid:
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Mopar Power Steering Fluid or equivalent (check manual for specific type)
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Brake Fluid:
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DOT 3 Brake Fluid
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Known Issues
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Engine 4 0L:
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Cracking cylinder head (especially early models, though less common on '88), camshaft wear, rear main seal leaks.
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Engine 2 5L:
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Carburetor tuning issues, exhaust manifold cracking.
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Transmission Aw4:
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Solenoid failures leading to shifting problems, valve body issues, potential for torque converter shudder.
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Electrical:
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Corrosion in fuse box and wiring connectors, failure of sensors (e.g., TPS, MAP sensor on 4.0L).
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Suspension:
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Leaf spring sag, worn bushings, steering box looseness.
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Rust:
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Common on rocker panels, wheel wells, and floor pans, especially in areas with road salt.
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