1987-1991 Isuzu Trooper Soft Top 2.6 i (UBS17) (116 Hp)

The Isuzu Trooper Soft Top 2.6i (UBS17), produced between 1987 and 1991, represents a unique iteration of the first-generation Trooper, a vehicle Isuzu positioned as a rugged, yet comfortable, sport utility vehicle. This variant, distinguished by its removable soft top, aimed to offer open-air driving enjoyment alongside the Trooper’s established four-wheel-drive capability. The UBS17 chassis code designates this specific body style and engine configuration. Within the broader Trooper lineup, the 2.6i Soft Top served as a more affordable and accessible entry point, appealing to buyers who prioritized recreational use over outright luxury or high performance. It was sold primarily in markets outside of North America, where the hardtop versions were more common.

Technical Specifications

Powertrain & Engine Architecture

The heart of the Trooper 2.6i Soft Top is the 2.6-liter 4ZD1 inline-four cylinder gasoline engine. This engine, a staple of Isuzu’s offerings during the late 1980s, is a naturally aspirated, overhead valve (OHV) design. It utilizes a cast iron block and an aluminum cylinder head, a common construction for durability and weight reduction. Fuel delivery is managed by a carburetor, a relatively simple system for the time, though it contributed to lower fuel economy compared to later fuel-injected models. The 4ZD1 engine produces 116 horsepower at approximately 4,800 rpm and 140 lb-ft of torque at 3,200 rpm. The engine’s relatively low compression ratio (typically around 8.5:1) allowed it to run on lower octane fuel, a benefit in many markets. The transmission paired with the 2.6i engine is typically a four-speed automatic, although a five-speed manual transmission was also available in some regions. The automatic transmission, while providing ease of use, is not known for its particularly quick shifts or advanced features. It’s a fairly conventional hydraulic control unit.

Driving Characteristics

The Trooper 2.6i Soft Top, with its 116 horsepower and automatic transmission, delivers a driving experience best described as adequate. Acceleration is leisurely, particularly when fully loaded or tackling steep inclines. The automatic transmission’s gear ratios are geared towards fuel economy and low-end torque, rather than outright performance. This means that while it’s capable of maintaining highway speeds, passing maneuvers require careful planning. Compared to the later, more powerful 3.1-liter V6 versions of the Trooper, the 2.6i feels significantly underpowered. The manual transmission option offered a more engaging driving experience and slightly improved acceleration, but the automatic was favored by many buyers for its convenience. The soft top itself adds a slight degree of body flex compared to the hardtop models, but this is generally not noticeable during normal driving conditions. The four-wheel-drive system, selectable via a lever inside the cabin, provides enhanced traction in off-road situations, making the Trooper a capable vehicle for light to moderate trail use.

Equipment & Trim Levels

The Trooper 2.6i Soft Top was generally equipped with a fairly basic level of standard features. Interior appointments typically included cloth upholstery, vinyl flooring, and a simple dashboard layout. Power steering was often standard, but power windows and locks were typically optional extras. Air conditioning was also frequently an optional upgrade. The soft top itself was usually made of a durable vinyl material and featured a rear window that could be unzipped and rolled up for open-air driving. Trim levels varied depending on the market, but generally, the 2.6i Soft Top represented the entry-level offering. Optional extras could include upgraded audio systems, alloy wheels, and a roof rack. The interior space is reasonably generous for a vehicle of its size, offering comfortable seating for four adults. However, cargo space is somewhat limited, especially with the rear seats in use.

Chassis & Braking

The Trooper Soft Top utilizes a body-on-frame construction, providing a robust and durable chassis. The suspension consists of independent front suspension with coil springs and a live axle rear suspension with leaf springs. This setup provides a comfortable ride on paved roads, while also offering sufficient articulation for off-road use. Braking duties are handled by disc brakes on the front wheels and drum brakes on the rear wheels. The braking system is adequate for normal driving conditions, but it lacks the stopping power of more modern vehicles. Stabilizer bars (anti-roll bars) are typically fitted to the front suspension to reduce body roll during cornering. The steering is a recirculating ball system, which provides a relatively direct feel but can exhibit some play over time.

Market Reception & Comparison

The Isuzu Trooper 2.6i Soft Top was generally well-received as an affordable and capable SUV. Critics praised its rugged construction, four-wheel-drive capability, and open-air driving experience. However, the 2.6-liter engine was often criticized for its lack of power, particularly when compared to larger-displacement engines offered in competing vehicles. Fuel economy was also considered to be relatively poor, especially given the carburetor-based fuel delivery system. Compared to the 3.1-liter V6 Trooper, the 2.6i offered significantly less performance but at a lower purchase price. The 2.6i also tended to be more reliable than the V6, as it had a simpler engine design and fewer potential points of failure. The Trooper competed with other SUVs of the era, such as the Suzuki Samurai, Mitsubishi Montero, and Nissan Pathfinder.

Legacy

The Isuzu Trooper 2.6i Soft Top, while not the most powerful or refined SUV of its time, holds a special place in the hearts of many enthusiasts. Its simple mechanical design and robust construction make it a relatively easy vehicle to maintain and repair. The 4ZD1 engine is known for its durability, and many examples are still on the road today. In the used car market, the Trooper 2.6i Soft Top is often sought after by off-road enthusiasts and those looking for a classic SUV with a unique character. Parts availability can be a challenge, but many parts are still available through aftermarket suppliers. The soft top itself can be prone to wear and tear, but replacement tops are available. Overall, the Trooper 2.6i Soft Top represents a charming and capable vehicle that offers a glimpse into the early days of the SUV boom.