🏷️ Basic Information

Make:

Jaguar

Model:

XJS

Year:

1991

Chassis Code:

XJ-S

Engine Code Prefix:

AJ6

👋 Introduction

Market Position Of Vehicle:

Luxury grand tourer, positioned as a high-performance, comfortable, and stylish coupe and convertible.

Competitors 1991:

BMW 8 Series, Mercedes-Benz SEC models, Aston Martin V8 Vantage, Porsche 928.

Key Features Of Vehicle:

Long-wheelbase chassis, powerful V12 engine (optional), refined interior, iconic styling, rear-wheel drive, independent suspension.

Value Proposition Of Manual:

Empowers owners to perform their own maintenance and repairs, saving significant costs associated with dealership servicing. Provides a deep understanding of the vehicle's mechanics.

📋 Manual Details

All Models Engines Trims Transmissions:

True

Estimated Page Count:

Extensive (Specific count not provided, but described as 'Complete Workshop Service Repair Manual')

Manual Type:

Workshop Service Repair Manual

Language:

English

Format:

Downloadable Digital File (PDF)

📖 Manual Coverage

Engine Systems:

Engine mechanical, fuel system (injection and carburetion where applicable), ignition system, cooling system, lubrication system, exhaust system, engine management (ECU).

Transmission Drivetrain:

Manual and automatic transmission overhaul and repair, clutch system, driveshafts, differentials, rear axle assembly.

Brake System:

Front and rear brake systems (calipers, rotors, pads, hydraulic lines, ABS where applicable), parking brake.

Suspension Steering:

Front and rear suspension components (springs, shocks, control arms, bushings), steering system (rack and pinion, power steering pump, linkages).

Electrical System:

Wiring diagrams, lighting system, starting and charging system, instrumentation, body electrical (wipers, windows, locks, mirrors), audio system, climate control electronics.

Body Chassis:

Body panels, doors, hood, trunk, glass, interior trim, chassis structural components, rust prevention and repair.

Climate Control:

Air conditioning system (refrigerant, compressor, evaporator, condenser), heating system, ventilation.

Maintenance Procedures:

Routine checks, oil and filter changes, fluid top-ups, tune-ups, spark plug replacement, belt inspection and replacement, brake pad replacement, tire rotation.

Repair Procedures:

Engine overhaul (top-end and bottom-end), transmission rebuild, suspension component replacement, brake caliper overhaul, power steering system repair, starter and alternator replacement, fuel pump replacement, radiator replacement, diagnostic troubleshooting.

Troubleshooting Diagnostics:

Step-by-step diagnostic procedures for common and uncommon issues, fault code interpretation (if applicable to the era's systems), electrical testing methods.

Technical Specifications:

Torque specifications for all fasteners, engine timing data, fluid capacities and types, electrical system voltages, component dimensions.

Air Conditioning Repair:

Service and repair of the AC system, including refrigerant handling, component replacement (compressor, receiver-drier, expansion valve), and leak detection.

Fuel System Diagnostics:

Diagnosis and repair of fuel injection systems, including fuel pressure testing, injector cleaning/replacement, and sensor troubleshooting.

Ignition System Service:

Spark plug indexing and gap setting, distributor maintenance (if applicable), coil testing, ignition module diagnostics.

Chassis Alignment:

Specifications and procedures for wheel alignment (caster, camber, toe-in) to ensure proper handling and tire wear.

Body And Trim Removal:

Instructions for the removal and installation of interior and exterior trim pieces for access to underlying components.

Wiring Diagrams:

Detailed wiring schematics for all electrical systems, crucial for troubleshooting and repair.

Depth Of Coverage:

Comprehensive, covering everything from basic maintenance to complete engine and transmission rebuilds, with detailed diagrams and instructions.

Engine Rebuild Detail:

Detailed instructions for engine disassembly, inspection of internal components (pistons, rings, bearings, crankshaft, camshaft), cylinder head overhaul, and reassembly with torque specifications.

📊 Manual Specifications

File Format:

PDF

Print Quality:

High quality, printable pages for individual chapters or the entire manual.

Binding Type:

N/A (Digital download - printable)

Paper Type:

N/A (Digital download - printable on user's choice of paper)

Software Requirements:

Adobe Reader (freely downloadable).

⚙️ Engine Specifications

Engine Options 1991:

4.0L Inline-6 (AJ6), 5.3L V12 (pre-'92 'Facelift' engine variant, though 6.0L V12 was introduced later in the XJS lineage).

Horsepower 4 0L Inline 6:

Approx. 225-245 hp (depending on specific market and tuning)

Torque 4 0L Inline 6:

Approx. 270-280 lb-ft

Horsepower 5 3L V12:

Approx. 263-318 hp (depending on fuel injection/carburetion and market)

Torque 5 3L V12:

Approx. 320-370 lb-ft

Fuel System Type:

Multi-point Fuel Injection (MPI) for Inline-6, Bosch Jetronic fuel injection for V12 (later models). Some earlier variants might have had carburetors, but 1991 is predominantly fuel injected.

Engine Management System:

ECU controlled ignition and fuel injection.

🔧 Transmission

Standard Transmission Type:

Automatic (e.g., ZF 4HP22 for V12, GM Turbo-Hydramatic 400 for some earlier models or variations, or Jaguar's own variants).

Optional Transmission Type:

Manual transmission (e.g., Getrag 5-speed) was available on some Inline-6 models, though less common than automatic.

Transmission Features:

Electronically controlled automatic transmissions on later models, offering comfort and performance.

📐 Dimensions

Exterior Length Coupe:

Approximately 196.4 inches (4989 mm)

Exterior Width:

Approximately 70.9 inches (1801 mm)

Exterior Height Coupe:

Approximately 50.6 inches (1285 mm)

Wheelbase:

Approximately 109.9 inches (2791 mm)

Curb Weight Approx:

4000-4500 lbs (1814-2041 kg), varying by engine and body style.

🛡️ Safety Features

Safety Ratings Era:

As with most vehicles of this era, formal crash test ratings (like NHTSA or Euro NCAP) were less standardized and publicly available compared to modern vehicles. Focus was on occupant protection with available safety features.

Active Safety Features:

Anti-lock Braking System (ABS) often standard or optional on higher trims.

Passive Safety Features:

Seat belts (three-point in front), reinforced body structure, padded interior surfaces, energy-absorbing steering column.

💡 Technology Features

Infotainment System 1991:

Typically a premium analog/digital radio with cassette player, often with multiple speakers and amplifier. Optional CD player may have been available later in the model's life.

Driver Assistance Features 1991:

Limited by modern standards. Cruise control was a common feature. ABS was the primary electronic driver aid.

Connectivity Features 1991:

No modern connectivity features like Bluetooth or USB. Primarily focused on in-car entertainment.

🔧 Maintenance

Oil Change Interval:

Typically every 5,000 to 7,500 miles (8,000 to 12,000 km) or 12 months, whichever comes first (refer to manual for exact specification).

Major Service Intervals:

Spark plug replacement, coolant flush, brake fluid service generally recommended at 30,000-60,000 mile intervals.

Engine Oil Spec:

API SG/SH or higher, viscosity typically 10W-40 or 20W-50 depending on climate (consult manual for precise specification, e.g., Castrol GTX).

Coolant Spec:

Ethylene glycol based antifreeze, usually a 50/50 mix with distilled water. Jaguar specific coolant might be recommended.

Transmission Fluid Auto:

Dexron III or equivalent for ZF transmissions.

Brake Fluid Spec:

DOT 3 or DOT 4 brake fluid.

Common Issues Xjs:

Rust (especially wheel arches, sills, and boot floor), aging electrical components and wiring harnesses, cooling system leaks (especially hose connections and radiator), potential for worn suspension bushings and ball joints, engine oil leaks (V12 especially can leak from rear main seal and valve covers), potential gearbox synchromesh issues on manual variants.

Specific Component Concerns:

Jaguar's self-leveling rear suspension (on some earlier models, not typically on 1991 4.0L) could be a source of issues. Fuel injectors on MPI systems can become clogged.

📚 Vehicle History

Jaguar Heritage:

Jaguar has a long-standing reputation for building luxurious, high-performance sports cars and grand tourers with elegant styling and a focus on driving dynamics.

Xjs Evolution Summary:

Launched in 1975, the XJS was a successor to the iconic E-Type. It evolved significantly over its lifespan, with engine updates (from 5.3L V12 to 4.0L Inline-6, and later 6.0L V12) and styling refinements. The 1991 model year represents a period of continued refinement and the dominance of the 4.0L AJ6 engine in many markets.

Xjs Production Years:

1975-1996

Xjs Manufacturing Location:

Coventry, England.

🏆 Awards & Recognition

Notable Recognitions:

The XJS was widely praised for its styling and grand touring capabilities throughout its production run. While specific awards for the 1991 model year may not be widely documented, the XJS as a model line was a consistent performer in its segment, contributing to Jaguar's prestige.