Engine:
Comprehensive coverage of 2.5L I4 and 4.0L I6 engines, including diagnostics, repair, overhaul, and specifications.
Transmission:
Detailed procedures for both manual (AX-5, NV3550) and automatic (AW-4, NP229) transmissions, including overhaul and adjustment.
Drivetrain:
Includes front and rear axles (Dana 30, Dana 35c, Chrysler 8.25), transfer cases (Command-Trac, Selec-Trac), differentials, and drivelines.
Suspension:
In-depth coverage of front (leaf spring and coil spring options for specific models/years in XJ lineage, though 1994 is primarily leaf spring rear, coil front) and rear suspension systems, steering components, and alignment procedures.
Brakes:
Front disc and rear drum brake systems, ABS (if equipped), hydraulic systems, parking brake, and component replacement.
Electrical System:
Wiring diagrams, fuse box layouts, lighting, ignition system, charging system, starting system, sensors, relays, and common electrical troubleshooting.
Body And Chassis:
Body panel removal and installation, interior trim, glass, doors, tailgate, frame and unibody structure analysis, corrosion prevention, and repair.
Cooling System:
Radiator, water pump, thermostat, heater core, hoses, coolant specifications, and troubleshooting.
Fuel System:
Fuel pump, fuel injectors, fuel pressure regulator, fuel tank, evaporative emissions control (EVAP), and fuel filter replacement.
Exhaust System:
Exhaust manifolds, catalytic converter, mufflers, pipes, and mounting hardware.
HVAC:
Air conditioning system, heating system, blower motor, climate controls, refrigerant servicing, and component replacement.
Scheduled Maintenance:
Detailed maintenance schedules for oil changes, filter replacements, fluid checks, spark plug replacement, belt inspection, and other routine services.
Engine Repair:
Step-by-step instructions for engine disassembly, component inspection, reassembly, timing chain/belt service, and rebuilding procedures.
Transmission Repair:
Comprehensive guides for transmission removal, disassembly, inspection of clutch packs, torque converter replacement, and reassembly for both manual and automatic units.
Brake Service:
Procedures for brake pad and shoe replacement, rotor and drum resurfacing/replacement, caliper and wheel cylinder overhaul, brake bleeding, and parking brake adjustment.
Electrical Diagnostics:
Systematic troubleshooting guides, using diagnostic codes, multimeter usage, and component testing for electrical issues.
Suspension And Steering Repair:
Replacement of ball joints, tie rod ends, control arm bushings, leaf springs, shock absorbers, steering box, and power steering pump.
Body Repair:
Instructions for removing and installing body panels, doors, fenders, hood, tailgate, bumpers, and interior trim components.
Troubleshooting Guides:
In-depth symptom-based troubleshooting for common drivability, electrical, and mechanical problems.
Depth Of Coverage:
Factory-level technical depth, suitable for professional technicians and advanced DIY mechanics. Covers from basic fluid changes to complete engine and transmission rebuilds.
Diagnostic Capabilities:
Includes diagnostic trouble codes (DTCs) for applicable systems, component testing specifications, and troubleshooting flowcharts.
Torque Specifications:
Detailed torque specifications for all critical fasteners across various systems.
Clearances And Tolerances:
Precise measurements for engine component clearances, bearing tolerances, and other critical machining specifications.
Oil Change Interval:
Typically every 3,000 to 5,000 miles or 3-6 months, depending on driving conditions (severe vs. normal).
Transmission Fluid Change:
Automatic: every 30,000-50,000 miles; Manual: check per manual, often longer intervals or inspection.
Coolant Flush:
Every 30,000 to 50,000 miles or 2-3 years.
Engine Oil Specification:
API Service SG or higher, SAE 10W-30 recommended for most conditions for both engines. Refer to manual for specific viscosity under extreme temperatures.
Transmission Fluid Automatic:
ATF+3 (Chrysler's designation) or equivalent Dexron III.
Transmission Fluid Manual:
GL-3 or GL-4 gear oil (e.g., SAE 75W-90 or 80W-90 depending on application and temperature).
Coolant Specification:
Mopar Antifreeze/Coolant (50/50 mix with distilled water) or equivalent ethylene glycol-based coolant meeting Chrysler MS-0600 specifications.
Common Problems 4.0L:
Cracked cylinder heads (especially earlier versions, though less common in 1994 compared to prior years), camshaft and lifter noise, distributorless ignition issues, oil filter adapter seal leaks.
Common Problems 2.5L:
Less prone to major head issues than the 4.0L, but can suffer from intake manifold gasket leaks, minor oil leaks, and wear on camshaft lobes.
Common Problems Chassis:
Front and rear leaf spring wear/sagging, worn control arm bushings, steering box looseness, water pump leaks, radiator leaks, and minor electrical gremlins.
Common Problems Body:
Rust, especially on rocker panels, floor pans, and tailgate hinges; interior trim wear and tear.