Vehicle Type:
Compact Sport Utility Vehicle (SUV)
Segment:
Off-road focused compact SUV
Competitors 1989:
Toyota 4Runner, Nissan Pathfinder, Ford Bronco II, Chevrolet S-10 Blazer
Signature Feature:
Renowned off-road capability, body-on-frame construction, removable doors and top.
Target Audience:
Off-road enthusiasts, recreational users, utility buyers.
Engine:
Yes (including disassembly, assembly, troubleshooting, and diagnostics)
Transmission:
Yes (manual and automatic, including clutch, gearbox, transfer case)
Drivetrain:
Yes (front and rear axles, driveshafts, differentials)
Suspension:
Yes (leaf springs, shocks, steering knuckles, alignment)
Brakes:
Yes (hydraulic system, calipers, master cylinder, parking brake)
Steering:
Yes (steering box, linkage, power steering system)
Electrical System:
Yes (wiring diagrams, battery, charging system, ignition, lighting, gauges, accessories)
Fuel System:
Yes (fuel tank, pump, lines, injectors, carburetor calibration for non-fuel injected models)
Cooling System:
Yes (radiator, fan, water pump, thermostat, coolant specifications)
Exhaust System:
Yes (manifold, catalytic converter, mufflers, pipes)
Body And Frame:
Yes (chassis, body panels, doors, hood, tailgate, interior trim)
HVAC:
Yes (heater core, A/C system if equipped, blower motor)
Maintenance:
Yes (oil changes, filter replacements, tune-ups, fluid checks)
Troubleshooting:
Yes (diagnostic flowcharts, symptom-based guides)
Repair:
Yes (component replacement, rebuilding, adjustments)
Diagnostics:
Yes (interpreting fault codes if applicable, component testing)
Rebuilding:
Yes (engine, transmission, axles)
Specifications:
Yes (torque values, clearances, fluid capacities, electrical resistance)
Depth:
Comprehensive, covering from basic maintenance to complete engine and transmission overhauls.
Engine Code Yj 2.5:
AMC 150
Engine Displacement Yj 2.5:
2.5 Liters (150 cubic inches)
Engine Configuration Yj 2.5:
Inline 4-cylinder
Horsepower Yj 2.5 Est:
112 hp @ 4500 RPM
Torque Yj 2.5 Est:
135 lb-ft @ 2800 RPM
Engine Code Yj 4.0:
AMC 242
Engine Displacement Yj 4.0:
4.0 Liters (242 cubic inches)
Engine Configuration Yj 4.0:
Inline 6-cylinder
Horsepower Yj 4.0 Est:
177 hp @ 4000 RPM
Torque Yj 4.0 Est:
220 lb-ft @ 3000 RPM
Fuel Delivery 2.5L:
Multi-Point Fuel Injection (MPFI)
Fuel Delivery 4.0L:
Multi-Point Fuel Injection (MPFI)
Recommended Fuel:
Unleaded gasoline
Standard Transmission Type:
5-speed manual (NV1500 or NV3550 for later YJ)
Optional Transmission Type:
3-speed automatic (TF-999)
Transfer Case:
Command-Trac NV231 part-time, 2.72:1 low-range ratio
Manual Transmission Fluid:
API GL-5, SAE 75W-90 (check manual for specific NV gears)
Automatic Transmission Fluid:
Chrysler ATF+3 (or equivalent)
Oil Change Interval:
Every 3,000 miles or 3 months (typical for this era, consult manual for specifics)
Transmission Fluid Change Interval:
Every 30,000 miles (manual), 24,000-30,000 miles (automatic, typical)
Coolant Change Interval:
Every 2 years or 30,000 miles
Engine Oil Type:
API SG, SAE 10W-30 or 10W-40 (consult manual for specific viscosity and API rating)
Engine Oil Capacity:
4.0L: 5 quarts (4.7 L) with filter; 2.5L: 5 quarts (4.7 L) with filter
Coolant Type:
Ethylene glycol based coolant (Green)
Yj Common Issues 1:
Leaf spring perches cracking, front sway bar disconnect issues, dashboard electrical gremlins, rust (especially on floor pans and rocker panels).
Yj Common Issues 2:
4.0L engine: oil filter adapter housing leaks, exhaust manifold cracks.
Yj Common Issues 3:
Transmission: wear on clutch components (manual), potential issues with torque converter lock-up (automatic).
Yj Common Issues 4:
Steering: play in steering box, worn tie rod ends.
Jeep Legacy:
Direct descendant of the original Willys military Jeep, known for ruggedness and off-road prowess.
Wrangler Yj Introduction:
Introduced for the 1987 model year as a successor to the CJ series, designed to be more civilized while retaining off-road capabilities.
Yj Distinguishing Features:
Rectangular headlights, significantly wider track, and coil springs were considered for later models but the YJ retained leaf springs, differentiating it from the CJ.
Manufacturing Location:
Toledo, Ohio, USA
