🏷️ Basic Information

Make:

Jeep

Model:

Grand Cherokee

Model Code:

WG

Year:

1999

👋 Introduction

Segment:

Mid-size Luxury SUV

Target Audience:

Owners and independent repair shops seeking detailed technical information for maintenance and repair.

Competitors 1999:

Ford Explorer, Chevrolet Blazer, Toyota 4Runner, Nissan Pathfinder

Distinguishing Features Vehicle:

Robust powertrain options, capable 4x4 systems (Quadra-Trac II), comfortable ride, and premium interior appointments for its class.

Manual Value Proposition:

Provides in-depth, factory-level repair information, enabling DIY enthusiasts and professionals to tackle complex tasks and save on dealership service costs.

📋 Manual Details

Engine Options:

4.0L I6 (190 hp), 4.7L V8 (220 hp)

Transmission Options:

42RE 4-Speed Automatic, 44RE 4-Speed Automatic, NV242 Selec-Trac Transfer Case, NV247 Quadra-Trac II Transfer Case

Drivetrain:

2WD and 4WD (Selec-Trac, Quadra-Trac II)

Trim Levels:

Laredo, Limited, Orvis

Estimated Pages:

1500+

Type:

Full Service and Repair Manual

Language:

English

Format:

Digital (PDF)

📖 Manual Coverage

Engine Mechanical:

Complete disassembly, inspection, repair, and reassembly of 4.0L I6 and 4.7L V8 engines, including cylinder head, block, crankshaft, connecting rods, pistons, camshafts, timing system, lubrication system, cooling system, and fuel injection.

Engine Electrical:

Ignition system, starting and charging systems, fuel system controls, emissions controls, sensors (MAP, TPS, O2, Crankshaft Position, Camshaft Position), Powertrain Control Module (PCM) diagnostics and reprogramming.

Transmission Automotive:

Repair and overhaul of 42RE and 44RE automatic transmissions, including valve body, torque converter, clutch packs, gear sets, and transmission control module (TCM) diagnostics.

Transfer Case:

Service and repair of NV242 Selec-Trac and NV247 Quadra-Trac II transfer cases, including chain and gear inspection, seal replacement, and electronic control unit (ECU) diagnostics.

Drivetrain:

Front and rear axle assemblies, differentials, CV joints, driveshafts, wheel bearings, and hubs.

Brakes:

Front and rear disc brake systems, ABS (Anti-lock Braking System) operation and diagnostics, hydraulic system, parking brake.

Suspension:

Front and rear suspension components (control arms, ball joints, tie rod ends, coil springs, shock absorbers), steering system (power steering pump, steering gear, linkages).

Electrical System:

Complete wiring diagrams, fuse box locations and functions, lighting systems, power windows, power locks, power seats, audio systems, instrument cluster, body control module (BCM).

HVAC:

Heating, ventilation, and air conditioning (HVAC) system operation, refrigerant handling, compressor, condenser, evaporator, blower motor, and climate control panel diagnostics.

Body And Interior:

Body panel removal and installation, door mechanisms, glass replacement, interior trim, seating, dashboard, and exterior lighting.

Routine Maintenance:

Oil and filter changes, fluid level checks and changes (coolant, brake fluid, power steering fluid, transmission fluid, differential fluid), tire rotation, spark plug replacement, air filter replacement, battery maintenance.

Troubleshooting:

Diagnostic procedures for common drivability issues, electrical faults, starting problems, overheating, and brake system malfunctions, including symptom-based troubleshooting charts.

Repair Procedures:

Step-by-step instructions for component removal, installation, and adjustment, including engine component replacement, transmission rebuilds, brake caliper replacement, and suspension linkage repair.

Diagnostics:

OBD-II (On-Board Diagnostics) system scanning and code interpretation, sensor testing, actuator testing, and wiring continuity checks.

Special Tools:

Identification and usage of specialized tools required for specific repair procedures.

Depth:

Comprehensive, covering everything from basic maintenance and tune-ups to full engine and transmission rebuilds, complex electrical diagnostics, and bodywork repairs.

📊 Manual Specifications

Digital Format:

PDF

Searchability:

Fully searchable text for quick information retrieval.

Printability:

Printable pages for on-the-job use.

Image Resolution:

High-resolution images, diagrams, and schematics.

Binding:

Not Applicable (Digital Format)

Paper Quality:

Not Applicable (Digital Format)

⚙️ Engine Specifications

Engine Code 1:

ERH (4.0L I6 OHV)

Displacement 1:

3952 cc (241 ci)

Bore X Stroke 1:

98.4 mm x 86.6 mm (3.87 in x 3.41 in)

Compression Ratio 1:

8.8:1

Horsepower 1:

190 hp @ 4800 rpm

Torque 1:

235 lb-ft @ 3200 rpm

Engine Code 2:

ENH (4.7L V8 OHV)

Displacement 2:

4701 cc (287 ci)

Bore X Stroke 2:

93.0 mm x 86.7 mm (3.66 in x 3.41 in)

Compression Ratio 2:

8.7:1

Horsepower 2:

220 hp @ 4700 rpm

Torque 2:

285 lb-ft @ 3200 rpm

Fuel Delivery:

Sequential Multiport Fuel Injection (MPI)

Fuel Type:

Unleaded Regular Gasoline (87 Octane recommended)

ECM:

Chrysler PCM (Powertrain Control Module)

🔧 Transmission

Automatic Transmission:

42RE 4-Speed Automatic (standard on 4.0L I6)

Automatic Transmission Optional:

44RE 4-Speed Automatic (standard on 4.7L V8)

Overdrive Gears:

Fourth gear is an overdrive ratio for improved fuel economy.

Automatic Transmission Fluid Type:

ATF+4 (Mopar)

42Re Capacity:

8.5 US quarts (8.0 L)

44Re Capacity:

10.2 US quarts (9.7 L)

Transfer Case 1:

NV242 Selec-Trac (Full-time 4WD, 2WD, 4WD Part-time)

Transfer Case 2:

NV247 Quadra-Trac II (Full-time 4WD with electronic control)

Nv242 Fluid:

ATF+4 (Mopar)

Nv247 Fluid:

ATF+4 (Mopar)

📐 Dimensions

Wheelbase:

2690 mm (105.9 in)

Length:

4615 mm (181.7 in)

Width:

1834 mm (72.2 in)

Height:

1620 mm (63.8 in)

Seating Capacity:

5

Cargo Volume Behind Rear Seat:

1000 L (35.3 cu ft)

Cargo Volume With Rear Seat Folded:

2000 L (70.7 cu ft)

Curb Weight Approx:

1830 - 1970 kg (4035 - 4343 lbs)

Gross Vehicle Weight Rating Gvwr Approx:

2540 kg (5600 lbs)

Towing Capacity Max:

3500 lbs (1588 kg)

Tongue Weight Max:

350 lbs (159 kg)

🛡️ Safety Features

NHTSA Rollover Rating:

4/5 Stars (Two-wheel drive), 3/5 Stars (Four-wheel drive) - Representative of the era, actual 1999 ratings may vary and are not directly comparable to modern standards.

ABS:

Standard 4-wheel disc brakes with ABS (Anti-lock Braking System)

Traction Control:

Optional on some models

Airbags:

Driver and front passenger airbags

Seatbelts:

3-point front and rear seatbelts

💡 Technology Features

Audio System:

Available AM/FM/CD player with optional premium sound system (e.g., Infinity).

Navigation:

Optional factory-installed GPS navigation system (rare for the era).

Cruise Control:

Standard

Keyless Entry:

Optional

Climate Control:

Manual or optional automatic climate control

Seats:

Cloth or optional leather-trimmed seating, power driver's seat

🔧 Maintenance

Oil Change Interval:

Every 5,000 miles or 6 months (whichever comes first) under normal driving conditions; severe conditions may require more frequent changes.

Tire Rotation Interval:

Every 7,500 miles

Transmission Fluid Change Interval:

Every 30,000 - 60,000 miles, depending on usage and driving conditions (consult manual for specifics).

Coolant Flush Interval:

Every 30,000 miles or 2 years

Engine Oil Type 1:

SAE 5W-30 (API Service SG or higher) for 4.0L I6

Engine Oil Type 2:

SAE 5W-30 (API Service SN or higher) for 4.7L V8

Engine Oil Capacity 1:

4.0L I6: 5.0 US quarts (4.7 L) with filter change

Engine Oil Capacity 2:

4.7L V8: 5.5 US quarts (5.2 L) with filter change

Coolant Type:

Mopar Antifreeze/Coolant (HOAT) 50/50 mix with distilled water

Brake Fluid Type:

DOT 3

Power Steering Fluid:

Mopar Power Steering Fluid or equivalent (ATF+4 may be acceptable in some cases, verify with manual)

Common Issue 1:

Cracked cylinder heads on early 4.7L V8 engines (often remedied by revised designs or head replacement).

Common Issue 2:

Water pump failure (common on both engines, especially with age).

Common Issue 3:

Minor coolant leaks from hoses and radiator.

Common Issue 4:

ABS sensor failures leading to ABS warning light illumination.

Common Issue 5:

PCM (Powertrain Control Module) failures, particularly with heat exposure.

Common Issue 6:

Interior electronic gremlins (window motors, power locks, etc.) due to age and wiring harness issues.

Common Issue 7:

Transfer case actuator or sensor issues, especially in Quadra-Trac II systems.

📚 Vehicle History

Jeep Legacy:

Founded on military utility vehicles, Jeep has a long-standing reputation for off-road capability and ruggedness.

Grand Cherokee Introduction:

First introduced in 1993 as a more luxurious and comfortable alternative to the Cherokee XJ, establishing the premium SUV segment for Jeep.

Zg Generation Debut:

The ZJ generation (1993-1998) was replaced by the WG generation (also known as WJ) for the 1999 model year.

Wg Generation Features:

The WG generation introduced a more refined interior, improved aerodynamics, a wider stance, and significantly updated powertrain options, including the new 4.7L PowerTech V8.

Manufacturing Location:

Jefferson North Assembly, Detroit, Michigan, USA

Production Period Wg:

1999-2004

🏆 Awards & Recognition

Initial Reception Critics:

Generally praised for its improved refinement, power (especially with the V8), and on-road manners compared to its predecessor, while retaining Jeep's off-road heritage.

Consumer Reports Rating Typical:

Variable; often cited for strong powertrains but potential for reliability issues as they aged, particularly concerning the 4.7L V8 and electronics. Manual provides solutions.