The Chevrolet Trailblazer I 4.2i 24V EXT 4WD (295 Hp) was a full-size SUV produced by Chevrolet from 2006 to 2009. Positioned as a more luxurious and capable alternative to the standard Trailblazer, the EXT model featured an extended wheelbase, providing increased cargo space and third-row passenger comfort. This particular variant, equipped with the 4.2-liter inline-six engine and a four-speed automatic transmission, represented a mid-range offering within the Trailblazer lineup, balancing power with relative affordability. It was primarily sold in the North American market, catering to families and those needing a robust vehicle for towing and hauling.
Technical Specifications
| Brand | Chevrolet |
| Model | Trailblazer |
| Generation | Trailblazer I |
| Type (Engine) | 4.2 i 24V EXT 4WD (295 Hp) |
| Start of production | 2006 |
| End of production | 2009 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 7 |
| Doors | 5 |
| Fuel consumption (urban) | 15.7 l/100 km (15 US mpg, 18 UK mpg) |
| Fuel consumption (extra urban) | 12.4 l/100 km (19 US mpg, 22.8 UK mpg) |
| Fuel Type | Petrol (Gasoline) |
| Maximum speed | 175 km/h (108.74 mph) |
| Weight-to-power ratio | 7.8 kg/Hp, 128 Hp/tonne |
| Weight-to-torque ratio | 6.1 kg/Nm, 162.7 Nm/tonne |
| Power | 295 Hp @ 6000 rpm |
| Power per litre | 71 Hp/l |
| Torque | 375 Nm @ 4800 rpm (276.59 lb.-ft. @ 4800 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | LL8 |
| Engine displacement | 4157 cm3 (253.68 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 93 mm (3.66 in.) |
| Piston Stroke | 102 mm (4.02 in.) |
| Compression ratio | 10.3:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 6.6 l (6.97 US qt | 5.81 UK qt) |
| Coolant | 9.2 l (9.72 US qt | 8.09 UK qt) |
| Kerb Weight | 2305 kg (5081.66 lbs.) |
| Max. weight | 2903 kg (6400.02 lbs.) |
| Max load | 598 kg (1318.36 lbs.) |
| Trunk (boot) space – minimum | 663 l (23.41 cu. ft.) |
| Trunk (boot) space – maximum | 3030 l (107 cu. ft.) |
| Fuel tank capacity | 94 l (24.83 US gal | 20.68 UK gal) |
| Length | 5279 mm (207.83 in.) |
| Width | 1895 mm (74.61 in.) |
| Height | 1957 mm (77.05 in.) |
| Wheelbase | 3277 mm (129.02 in.) |
| Front track | 1603 mm (63.11 in.) |
| Rear (Back) track | 1577 mm (62.09 in.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 4 gears, automatic transmission |
| Front suspension | Double wishbone |
| Rear suspension | Coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 245/65 R17 |
Powertrain & Engine Architecture
The heart of the Trailblazer I 4.2i EXT 4WD was the LL8 4.2-liter inline-six engine. This engine, a member of Chevrolet’s Vortec family, was known for its robust construction and relatively smooth operation. It featured a cast iron block with aluminum cylinder heads, and a double overhead camshaft (DOHC) valvetrain operating four valves per cylinder. Fuel delivery was handled by a multi-port fuel injection system, providing precise fuel metering for optimal combustion. The engine produced 295 horsepower at 6000 rpm and 375 lb-ft of torque at 4800 rpm. Paired with this engine was a four-speed automatic transmission, a 4L60-E unit, chosen for its durability and suitability for towing. While not the most modern transmission by today’s standards, it provided adequate performance for the vehicle’s intended use.
Driving Characteristics
The 4.2-liter engine and four-speed automatic combination delivered respectable, though not exhilarating, performance. Acceleration from 0 to 60 mph was typically in the 7.5 to 8.5 second range, depending on load and road conditions. The automatic transmission’s gear ratios were geared more towards towing and hauling than outright speed. The first gear was relatively short, aiding in initial acceleration and providing good low-end torque for off-road situations. However, the wide gear spacing meant that the engine could feel strained at higher speeds, particularly when fully loaded. Compared to the Trailblazer’s available 5.3-liter V8, the 4.2-liter offered less overall power, but it was generally more fuel-efficient. The 4WD system provided enhanced traction in slippery conditions, making it a capable vehicle for inclement weather and light off-roading.
Equipment & Trim Levels
The Trailblazer EXT 4WD with the 4.2-liter engine typically came standard with features such as air conditioning, power windows and locks, a CD player, and cloth upholstery. The EXT model also included features like a power liftgate and a more spacious interior compared to the standard Trailblazer. Optional extras included leather upholstery, a premium sound system, a DVD entertainment system, and a sunroof. The trim level could vary, with options like LT and LTZ offering progressively more features and luxury appointments.
Chassis & Braking
The Trailblazer I utilized a body-on-frame construction, providing a robust and durable platform. The front suspension consisted of an independent double wishbone setup, while the rear featured a solid axle with coil springs. This configuration provided a comfortable ride, but also resulted in some body roll during cornering. Braking duties were handled by ventilated discs on all four wheels, coupled with an Anti-lock Braking System (ABS) for improved stopping power and control. The braking system was adequate for the vehicle’s weight, but not particularly sporty.
Market Reception & Comparison
The Trailblazer I 4.2i EXT 4WD was generally well-received by consumers seeking a large, capable SUV. Critics praised its spacious interior, comfortable ride, and strong towing capacity. However, the 4.2-liter engine was sometimes criticized for being underpowered compared to the available V8 options. Fuel economy was also a concern, with the 4.2-liter engine averaging around 15 mpg in city driving and 19 mpg on the highway. Compared to the 5.3-liter V8 Trailblazer, the 4.2-liter offered a more affordable entry point, but at the expense of performance. The 4.2L was often seen as a good compromise for those who didn’t require the maximum towing capacity or acceleration.
Legacy
The Chevrolet Trailblazer I, including the 4.2i EXT 4WD variant, has established a reputation for reliability, particularly the powertrain. The LL8 4.2-liter engine is known for its durability, and with proper maintenance, can last for many years. However, like many vehicles of this era, they are prone to certain issues, such as corrosion and wear and tear on suspension components. In the used car market today, these Trailblazers are relatively affordable and represent a good value for those seeking a large, capable SUV. They remain popular with those needing a vehicle for towing, hauling, or simply navigating challenging road conditions. The EXT model, with its extended wheelbase and increased cargo space, is particularly sought after by families and those who prioritize practicality.
