Engine:
Comprehensive coverage for all powertrain configurations including 4.0L Inline-6 and 2.5L Inline-4 gasoline engines.
Transmission:
Detailed procedures for manual (AX-4, AX-5) and automatic (AW-4, NP229/NP231 transfer case) transmissions.
Drivetrain:
Front and rear axle assemblies, differentials, driveshafts, CV joints, and four-wheel-drive system operation and repair.
Suspension:
Front and rear suspension components, springs, shock absorbers, steering linkage, alignment procedures, and leaf spring replacement (rear).
Brakes:
Front disc and rear drum brake systems, hydraulic components, parking brake system, and bleeding procedures.
Electrical:
Complete electrical schematics, wiring diagrams, starter, alternator, battery, ignition system, lighting, and accessory circuits.
Fuel System:
Fuel tank, fuel pump, fuel injectors (EFI systems), fuel filter, and fuel line diagnostics.
Cooling System:
Radiator, fan clutch, water pump, thermostat, hoses, and coolant specifications.
Exhaust System:
Exhaust manifolds, catalytic converter, mufflers, and pipe routing.
Body:
Body panel removal and installation, door mechanisms, interior trim, and glass replacement.
HVAC:
Heating, ventilation, and air conditioning system components, operation, and service.
Maintenance:
Scheduled maintenance tasks, fluid changes, filter replacements, and lubrication points.
Diagnostics:
Troubleshooting guides for common drivability issues, electrical faults, and mechanical failures.
Repair:
Step-by-step repair instructions for virtually all components and systems of the vehicle.
Overhaul:
Detailed engine and transmission overhaul procedures, including component specifications and tolerances.
Rebuilding:
Rebuilding procedures for specific components such as brake calipers, power steering pumps, and alternators.
Troubleshooting Charts:
Specific troubleshooting flowcharts for common symptoms and potential causes.
Depth:
Comprehensive from basic maintenance to full engine and transmission rebuilds.
Diagnostic Tools:
Guidance on using standard automotive diagnostic tools and interpreting results.
Engine 1 Variant:
4.0L (242 cu in) OHV V6 (AMC 4.0)
Engine 1 Power:
Approx. 177 hp @ 4700 rpm
Engine 1 Torque:
Approx. 220 lb-ft @ 3200 rpm
Engine 2 Variant:
2.5L (150 cu in) OHV Inline-4 (AMC 2.5L 'Tech IV')
Engine 2 Power:
Approx. 121 hp @ 4800 rpm
Engine 2 Torque:
Approx. 170 lb-ft @ 2400 rpm
Fuel Delivery:
Multi-point fuel injection (MPI) for 4.0L, Throttle body injection (TBI) for 2.5L.
Recommended Fuel:
87 Octane Unleaded Gasoline
Oil Change Interval:
Every 3,000 miles or 3 months (traditional recommendation).
Transmission Fluid Change:
Every 30,000 miles or 24 months (AW-4 Automatic), Consult manual for AX-5 Manual.
Coolant Change Interval:
Every 30,000 miles or 24 months.
Engine Oil Spec:
API SG or higher, SAE 10W-30 (check manual for temperature variations).
Transmission Fluid Spec Aw4:
ATF+2 or equivalent (Dexron II).
Transmission Fluid Spec Ax5:
GL-4 SAE 75W-90 Gear Oil (consult manual for exact type).
Coolant Spec:
Mopar Antifreeze/Coolant (50/50 mix with distilled water).
Common Problems 1989:
Rust (especially unibody frame rails, floor pans, rocker panels), heater core leaks, aging electrical connectors, overdrive unit issues in AW-4 transmission, potential for head gasket leaks in early 4.0L versions.
