Segment:
Compact SUV / Sport Utility Vehicle
Reputation:
Known for ruggedness, off-road capability, and Jeep's iconic styling.
Competitors:
Ford Bronco II, Chevrolet S-10 Blazer, Toyota 4Runner, Nissan Pathfinder.
Chassis Design:
Unibody construction, a significant departure from traditional body-on-frame SUVs, offering improved on-road manners and weight savings.
4X4 System:
Renowned Selec-Trac (optional full-time 4WD) and Command-Trac part-time 4WD systems.
Offroad Capability:
Solid front and rear axles (on most models), good ground clearance, and robust suspension geometry.
Engine Types:
4.0L Inline-6 (242 cu in) OHV, 2.5L Inline-4 (150 cu in) OHV
Engine Management:
EFI (Electronic Fuel Injection), ignition timing, sensors, actuators
Transmission Options:
AX-5 Manual, AX-15 Manual, AW4 Automatic
Transfer Case:
NP231 Command-Trac (2WD/4WD Part-Time)
Suspension Type:
Front: Leaf Spring Solid Axle, Rear: Leaf Spring Solid Axle
Braking System Details:
Front: Disc Brakes, Rear: Drum Brakes (some later models may have rear discs)
Electrical Diagnostics:
Battery, alternator, starter, fuses, relays, lighting, instrumentation, ignition system
Scheduled Maintenance:
Oil changes, filter replacements, fluid checks, spark plug replacement, belt inspection/replacement
Engine Overhaul:
Engine disassembly, inspection, reassembly, valve jobs, piston replacement
Transmission Rebuild:
Manual and automatic transmission overhaul procedures
Brake Service:
Pad/shoe replacement, rotor/drum resurfacing/replacement, caliper/wheel cylinder service
Suspension Repair:
Ball joint replacement, tie rod replacement, shock/strut replacement, leaf spring service
Electrical Troubleshooting:
Diagnostic procedures for common electrical faults, wiring harness repair
HVAC Repair:
Component replacement (compressor, condenser, heater core), refrigerant system servicing
Body Panel Repair:
Dent repair, panel replacement, rust remediation guidance
Torque Specifications:
Detailed torque values for all fasteners
Diagnostic Trouble Codes:
P-codes and manufacturer-specific codes for engine management systems
Depth:
Comprehensive: Covers basic maintenance to full component rebuilds and advanced diagnostics.
Diagnostic Tools:
Explains use of common diagnostic tools and procedures.
Engine 1:
4.0L (3960cc) OHV Inline-6, 'High Output' in later years.
Engine 1 Code:
242 cu in (often referred to as the '242')
Engine 2:
2.5L (2467cc) OHV Inline-4 'Tech' or 'AMC 150'.
4.0L Horsepower Est:
Approx. 177-190 hp (depending on year and tuning)
4.0L Torque Est:
Approx. 220-235 lb-ft (depending on year and tuning)
2.5L Horsepower Est:
Approx. 121-130 hp
2.5L Torque Est:
Approx. 170-175 lb-ft
Fuel Delivery:
Multi-point Electronic Fuel Injection (MPI)
Fuel Type:
Unleaded Gasoline
Required Octane:
87 Octane (89 Octane recommended for optimal performance in the 4.0L)
Standard Transmission:
AX-5 Manual Transmission (typically with 2.5L engine), AX-15 Manual Transmission (typically with 4.0L engine)
Optional Transmission:
AW4 Automatic Transmission (4-speed with torque converter lock-up)
Transfer Case Standard:
New Process (NP) NP231 'Command-Trac' (Part-time, 2WD High, N, 4WD High, 4WD Low)
Transfer Case Optional:
New Process (NP) NP242 'Selec-Trac' (Full-time 4WD available, 2WD High, N, 4WD High, 4WD Low)
Axle Ratios:
Typically 3.73 or 4.10 (depending on trim and original equipment)
Length:
167.4 - 172.6 inches (depending on bumper/spare tire carrier)
Width:
69.3 - 69.8 inches
Height:
62.0 - 63.3 inches
Curb Weight Est:
Approx. 3,300 - 3,700 lbs (depending on engine, transmission, and 2WD/4WD configuration)
Towing Capacity Est:
Up to 2,000 lbs (may vary with engine and options)
NHTSA Rollover Resistance Est:
2WD: 7.55, 4WD: 7.22 (all models tested had a high center of gravity)
Braking System:
Standard front disc, rear drum brakes. Anti-lock Braking System (ABS) available on rear wheels in later years (1993+ on some models).
Seat Belts:
Front and rear seat belts. Shoulder belts for front occupants.
Airbags:
Driver-side airbag introduced in 1994 model year. Passenger airbag not generally available during this period.
Audio System:
Factory AM/FM radio, often with cassette player. Optional CD player in later years.
Speakers:
Typically 4 speakers (2 front, 2 rear). Optional premium sound systems may have more.
ABS:
Available on rear wheels in later years (1993+).
Cruise Control:
Optional feature, standard on higher trim levels.
OBD Ii Compliance:
Introduced with the 1994 model year, supporting On-Board Diagnostics II.
Oil Change Interval:
Every 3,000-5,000 miles or 6 months (depending on oil type and driving conditions)
Transmission Fluid Change:
Manual: Every 30,000-50,000 miles. Automatic: Every 30,000-45,000 miles.
Coolant Flush:
Every 30,000-50,000 miles or 2-3 years.
Spark Plug Replacement:
4.0L: Approx. 100,000 miles (platinum tipped). 2.5L: Approx. 30,000-60,000 miles (copper tipped).
Drive Belt Inspection:
Inspect every 15,000 miles, replace as needed (typically every 60,000-100,000 miles).
Engine Oil Type:
SAE 10W-30 (preferred for 4.0L), SAE 10W-30 or 10W-40 for 2.5L
Engine Oil Capacity:
4.0L: 5 quarts (with filter). 2.5L: 5 quarts (with filter).
Transmission Fluid Manual:
AX-5: NVGL-4 (GL-4 rated gear oil, e.g., Red Line MT-90). AX-15: NVGL-4 or NVGL-5 (GL-5 rated gear oil, e.g., Royal Purple Synchromesh).
Transmission Fluid Automatic:
ATF+3 or ATF+4 (Chrysler spec, equivalent to Mopar MS-7176 or MS-9224). Check manual for precise specification.
Transfer Case Fluid:
ATF+4 (Chrysler spec, equivalent to Mopar MS-9224 for NP231/NP242)
Power Steering Fluid:
Mopar Power Steering Fluid or ATF+4 (check specific year)
Coolant:
Chrysler HOAT (Hybrid Organic Acid Technology) coolant, typically a green or orange color. Mix 50/50 with distilled water.
Common Problem 1:
Head gasket leaks (especially on early 4.0L engines, though later ones are more robust).
Common Problem 2:
Cracked cylinder heads (less common than head gasket, but a known issue).
Common Problem 3:
Rust on body panels, especially rockers, fenders, and rear quarter panels.
Common Problem 4:
Premature wear of front suspension components (ball joints, tie rods, track bar on some models).
Common Problem 5:
Leaking rear main crankshaft seal.
Common Problem 6:
Failure of the Automatic Transfer Case (ATC) shift module on NP242 Selec-Trac models if equipped.
Jeep Legacy:
Descended from rugged, utilitarian military vehicles, Jeep has a long history of off-road prowess and durability.
Xj Introduction:
Introduced for the 1984 model year, the XJ was a revolutionary vehicle, pioneering the compact SUV segment with its unibody construction.
Major Updates Within Years:
Mid-cycle refresh around 1991 included updated interior and exterior styling, improved aerodynamics, and revised powertrains. 1994 saw the introduction of airbags and OBD-II compliance on some models.
Manufacturing Location:
Toledo, Ohio, USA
Production Span:
1984-2001 (globally, with North American production ending in 2001)