Engine Mechanical:
Complete engine overhaul, assembly, disassembly, internal components, cooling system, lubrication system, fuel delivery system, ignition system.
Engine Control:
Engine Control Module (ECM) diagnostics, sensor testing, actuator testing, emissions control systems.
Transmission Manual:
Manual transmission overhaul, clutch system, gearshift linkage, repair procedures.
Transmission Automatic:
Automatic transmission overhaul, torque converter, valve body, hydraulic control, repair procedures.
Drivetrain:
Transfer case operation and repair, front and rear axle assemblies, differentials, driveshafts, universal joints, CV joints (if applicable).
Suspension:
Front and rear suspension systems, coil springs, leaf springs (rear), shock absorbers, control arms, ball joints, bushings, alignment specifications.
Steering:
Power steering system, steering gear, tie rods, steering column, hydraulic pump, fluid specifications.
Brakes:
Front and rear brake systems (disc/drum configurations), hydraulic lines, master cylinder, brake booster, calipers, wheel cylinders, parking brake system.
Electrical System:
Battery, charging system (alternator), starting system (starter motor), lighting system, gauges, warning indicators, wiring diagrams, fuse box locations.
HVAC:
Heating, Ventilation, and Air Conditioning (HVAC) system, components, refrigerant, performance testing, repair.
Body And Frame:
Body panel removal and installation, door mechanisms, interior trim, glass, frame straightening and repair (structural).
Chassis Electrical:
Power windows, power locks, mirrors, windshield wipers, horn, audio system wiring.
Routine Maintenance:
Oil changes, filter replacements, fluid checks and top-offs, lubrication, tire rotation, spark plug replacement.
Troubleshooting:
Diagnostic flowcharts for common problems, symptom-based troubleshooting guides, fault code interpretation.
Component Replacement:
Step-by-step instructions for replacing major and minor components across all systems.
Rebuilds Overhauls:
Detailed instructions for rebuilding engines, transmissions, differentials, and other major assemblies.
Diagnostics:
Procedures for diagnosing electrical faults, mechanical issues, and system malfunctions using specialized tools.
Adjustments:
Brake adjustments, clutch adjustments, throttle cable adjustments, idle speed adjustments.
Specifications Torque:
Comprehensive list of torque specifications for all critical fasteners and components.
Depth:
Comprehensive, covering basic maintenance to advanced engine and transmission rebuilds.
Engine Code 1:
2.5L AMC 150 (Iron Duke)
Displacement 1:
2.5 Liters (150 cu in)
Configuration 1:
Inline-4 Cylinder
Horsepower 1 Est:
115-125 hp (varies by year)
Torque 1 Est:
130-140 lb-ft (varies by year)
Fuel System 1:
Throttle Body Injection (TBI) initially, later Electronic Fuel Injection (EFI).
Engine Code 2:
4.0L AMC 242 (Straight-6)
Displacement 2:
4.0 Liters (242 cu in)
Configuration 2:
Inline-6 Cylinder
Horsepower 2 Est:
170-190 hp (varies by year)
Torque 2 Est:
215-220 lb-ft (varies by year)
Fuel System 2:
Electronic Fuel Injection (EFI) - Renowned for its durability and torque.
Engine Code 3:
2.1L VM Motori Turbodiesel
Displacement 3:
2.1 Liters (128 cu in)
Configuration 3:
Inline-4 Cylinder (Turbodiesel)
Horsepower 3 Est:
85-90 hp (approximate)
Torque 3 Est:
140-150 lb-ft (approximate)
Fuel System 3:
Direct Injection, Turbocharged
Infotainment Features Early:
AM/FM radio, cassette player, optional CD player (late in the production run).
Infotainment Features Late:
Improved stereo systems with more speakers.
Driver Assistance Features:
Very limited for this era; focus was on mechanical capability rather than electronic aids. ABS became more common in later years (90s).
Connectivity Features:
No significant connectivity features like Bluetooth or USB; basic diagnostics rely on physical inspection and multimeter readings.
Oil Change Interval Est:
3,000 - 5,000 miles (4,800 - 8,000 km) or 3-6 months, depending on driving conditions.
Transmission Fluid Interval Est:
30,000 - 60,000 miles (48,000 - 96,000 km), check manual for specific recommendations.
Coolant Flush Interval Est:
30,000 - 50,000 miles (48,000 - 80,000 km)
Spark Plug Replacement Interval Est:
30,000 - 60,000 miles (48,000 - 96,000 km), depending on plug type.
Engine Oil Spec:
API SG or higher; SAE 10W-30 (check manual for seasonal variations and specific engine).
Coolant Spec:
Ethylene Glycol based coolant, typically a 50/50 mix with distilled water. Consult manual for specific type (e.g., conventional green or HOAT).
Automatic Transmission Fluid Spec:
ATF+3 or ATF+4 for later models, consult manual for specific AW4 requirements (often Dexron II/III compatible).
Manual Transmission Fluid Spec:
GL-4 gear oil, SAE 75W-90 or 80W-90.
Power Steering Fluid Spec:
Mopar Power Steering Fluid or Dexron II/III ATF.
Common Issue 1:
Renix EFI system (early 4.0L models): Idle Air Control (IAC) valve issues, Crankshaft Position Sensor (CKP) failures, Throttle Position Sensor (TPS) failures.
Common Issue 2:
Headliner sagging (common for many vehicles of this age).
Common Issue 3:
Rust: Particularly prone to frame rust in the unibody structure and rocker panels, especially in areas with road salt.
Common Issue 4:
Cooling system: Radiator leaks, water pump failures, heater core issues are common maintenance points.
Common Issue 5:
Leaf spring 'િsag' (rear suspension) on higher mileage vehicles.
Common Issue 6:
Axle U-joint wear (driveshafts) leading to clunking noises.
