The Jaguar XJS Coupe 4.0, produced between 1994 and 1996, represented a significant evolution in the long-running XJS series. Falling within the final years of XJS production (1975-1996), this variant aimed to provide a blend of grand touring comfort and improved performance compared to earlier, smaller-displacement models. It occupied a mid-to-high position in the XJS lineup, offering a step up from the 3.6-liter inline-six and positioned below the even more potent 6.0-liter V12 versions. The 4.0-liter engine was a key component of Jaguar’s efforts to modernize the XJS and appeal to a broader range of buyers.
Technical Specifications
| Brand | Jaguar |
| Model | XJS |
| Generation | XJS Coupe |
| Type (Engine) | 4.0 (233 Hp) |
| Start of production | 1994 |
| End of production | 1996 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (combined) | 10.7 l/100 km |
| Fuel consumption (US mpg) | 22 |
| Fuel consumption (UK mpg) | 26.4 |
| Fuel consumption (km/l) | 9.3 |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 7.7 sec |
| Acceleration 0 – 62 mph | 7.7 sec |
| Acceleration 0 – 60 mph | 7.3 sec |
| Maximum speed | 237 km/h (147.26 mph) |
| Weight-to-power ratio | 7.3 kg/Hp |
| Weight-to-torque ratio | 4.7 kg/Nm |
| Power | 233 Hp @ 4700 rpm |
| Power per litre | 58.5 Hp/l |
| Torque | 366 Nm @ 4000 rpm (269.95 lb.-ft. @ 4000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine displacement | 3980 cm3 (242.87 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 91 mm (3.58 in.) |
| Piston Stroke | 102 mm (4.02 in.) |
| Compression ratio | 10:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated |
| Valvetrain | DOHC |
| Kerb Weight | 1705 kg (3758.88 lbs.) |
| Max. weight | 2055 kg (4530.5 lbs.) |
| Max load | 350 kg (771.62 lbs.) |
| Trunk (boot) space – minimum | 407 l (14.37 cu. ft.) |
| Fuel tank capacity | 89 l (23.51 US gal | 19.58 UK gal) |
| Length | 4820 mm (189.76 in.) |
| Width | 1793 mm (70.59 in.) |
| Height | 1254 mm (49.37 in.) |
| Wheelbase | 2588 mm (101.89 in.) |
| Front track | 1489 mm (58.62 in.) |
| Rear (Back) track | 1504 mm (59.21 in.) |
| Drivetrain Architecture | Rear wheel drive |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 5 gears, manual transmission |
| Front suspension | Double wishbone |
| Rear suspension | Double wishbone |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Power steering | Hydraulic Steering |
| Tires size | 225/55 ZR16 |
Powertrain & Engine Architecture
The heart of the XJS 4.0 was the AJ6 inline-six engine, a 3,980cc (242.87 cubic inch) unit. This engine represented a significant upgrade from the earlier 3.6-liter version, featuring a larger bore and stroke. The AJ6 utilized a multi-port fuel injection system and a double overhead camshaft (DOHC) valvetrain, contributing to its improved power output. The engine produced 233 horsepower at 4,700 rpm and 366 Nm (269.95 lb-ft) of torque at 4,000 rpm. The 5-speed manual transmission was standard, providing drivers with full control over the engine’s power. While an automatic transmission was available, the manual was favored by enthusiasts for its responsiveness.
Driving Characteristics
The XJS 4.0 with the manual transmission offered a noticeably more engaging driving experience than its predecessors. The increased power and torque allowed for brisk acceleration – 0 to 60 mph in approximately 7.3 seconds – and a comfortable cruising speed on highways. The gear ratios were well-matched to the engine’s characteristics, providing strong pull throughout the rev range. Compared to the automatic version, the manual offered more precise control and a more direct connection to the engine. While not a sports car in the modern sense, the XJS 4.0 provided a refined and capable grand touring experience.
Equipment & Trim Levels
The XJS 4.0 typically came well-equipped, reflecting its position as a luxury coupe. Standard features included leather upholstery, power windows and locks, air conditioning, and an upgraded sound system. Optional extras included a sunroof, premium audio systems, and various trim enhancements. The interior design was characterized by its wood veneer trim and comfortable, supportive seats. The XJS 4.0 aimed to provide a luxurious and comfortable environment for both driver and passengers.
Chassis & Braking
The XJS 4.0 retained the XJS’s robust chassis and suspension design. It featured a double wishbone suspension at both the front and rear, providing a comfortable ride and good handling characteristics. Ventilated disc brakes were fitted to all four wheels, providing ample stopping power. Anti-lock braking system (ABS) was standard, enhancing safety. The suspension was tuned to prioritize comfort over outright sportiness, but still offered a reasonably controlled driving experience. The car’s weight of approximately 1705 kg (3758.88 lbs) was managed effectively by the suspension and braking systems.
Market Reception & Comparison
The XJS 4.0 was generally well-received by automotive critics. It was praised for its improved performance, refined interior, and comfortable ride. Compared to the 3.6-liter XJS, the 4.0 offered a significant boost in power and torque, making it a more enjoyable car to drive. However, it was also noted that the XJS 4.0 was not as dynamically engaging as some of its European rivals. Fuel economy, at around 22 US mpg combined, was typical for a luxury coupe of its era. Compared to the V12 models, the 4.0 offered a better balance of performance and reliability, with the V12s being known for their complex maintenance requirements.
Legacy
The Jaguar XJS 4.0 remains a popular choice among classic Jaguar enthusiasts. The AJ6 engine, while not without its quirks, is generally considered to be a reliable and durable unit. Parts availability is reasonably good, and the car’s relatively simple mechanical design makes it easier to maintain than some of its more complex contemporaries. Today, well-maintained XJS 4.0 coupes are sought after for their classic styling, comfortable ride, and relatively affordable price point. The 4.0-liter variant represents a sweet spot in the XJS lineup, offering a good balance of performance, luxury, and reliability, ensuring its continued appeal in the used car market.
