The GMC Envoy II XL, produced between 2003 and 2006, represented a significant refresh of GMC’s mid-size SUV offering. Built on the GMT370 platform, the Envoy II aimed to provide a blend of truck-based durability with improved refinement and features. The 4.2i 24V variant, equipped with a 4.2-liter inline-six engine producing 275 horsepower and paired with a four-speed automatic transmission, occupied a prominent position in the Envoy II lineup, offering a balance between capability and affordability. This configuration was targeted towards families and individuals needing a versatile vehicle for both daily driving and occasional towing.
Technical Specifications
| Brand | GMC |
| Model | Envoy |
| Generation | Envoy II XL (GMT370) |
| Type (Engine) | 4.2i 24V (275 Hp) Automatic |
| Start of production | 2003 |
| End of production | 2006 |
| 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, 6.4 km/l) |
| Fuel consumption (extra urban) | 11.8 l/100 km (19.9 US mpg, 23.9 UK mpg, 8.5 km/l) |
| Fuel consumption (combined) | 13.8 l/100 km (17 US mpg, 20.5 UK mpg, 7.2 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 8.8 sec |
| Acceleration 0 – 62 mph | 8.8 sec |
| Acceleration 0 – 60 mph | 8.4 sec |
| Maximum speed | 175 km/h (108.74 mph) |
| Weight-to-power ratio | 8.1 kg/Hp, 122.8 Hp/tonne |
| Weight-to-torque ratio | 6 kg/Nm, 166.5 Nm/tonne |
| Power | 275 Hp @ 6000 rpm |
| Power per litre | 66.1 Hp/l |
| Torque | 373 Nm @ 3600 rpm (275.11 lb.-ft. @ 3600 rpm) |
| Maximum engine speed | 6300 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | LL8 |
| Engine displacement | 4160 cm3 (253.86 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 | 10:1 |
| 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 capacity | 13.1 l (13.84 US qt | 11.53 UK qt) |
| Kerb Weight | 2240 kg (4938.35 lbs.) |
| Max. weight | 2812 kg (6199.4 lbs.) |
| Max load | 572 kg (1261.04 lbs.) |
| Trunk (boot) space – minimum | 631 l (22.28 cu. ft.) |
| Trunk (boot) space – maximum | 2839 l (100.26 cu. ft.) |
| Fuel tank capacity | 96.1 l (25.39 US gal | 21.14 UK gal) |
| Permitted trailer load with brakes (12%) | 2676 kg (5899.57 lbs.) |
| Length | 5271 mm (207.52 in.) |
| Width | 1897 mm (74.69 in.) |
| Height | 1917 mm (75.47 in.) |
| Wheelbase | 3275 mm (128.94 in.) |
| Front track | 1603 mm (63.11 in.) |
| Rear (Back) track | 1576 mm (62.05 in.) |
| Ride height (ground clearance) | 203 mm (7.99 in.) |
| Minimum turning circle | 12.6 m (41.34 ft.) |
| Approach angle | 34.6° |
| Departure angle | 23.1° |
| Drivetrain Architecture | Rear wheel drive |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 4 gears, automatic transmission Hydra-Matic |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 245/65 R17 |
| Wheel rims size | 7.0J x 17 |
Powertrain & Engine Architecture
The heart of the Envoy II XL 4.2i was the LL8 engine, a 4.2-liter (253.86 cubic inches) inline-six cylinder powerplant. This engine utilized a cast iron block with aluminum cylinder heads, featuring dual overhead camshafts (DOHC) and four valves per cylinder. The LL8 employed multi-port fuel injection, delivering fuel directly into the intake ports for optimized combustion. The 4L60-E four-speed automatic transmission, commonly known as the Hydra-Matic, was the sole transmission option for this variant. This transmission was known for its durability and smooth shifting characteristics, though it lacked the efficiency of more modern transmissions with additional gears. The engine’s longitudinal mounting allowed for a rear-wheel-drive configuration, providing a more traditional truck-like feel.
Driving Characteristics
The 275 horsepower and 275 lb-ft of torque provided by the 4.2-liter engine delivered adequate performance for the Envoy II XL. Acceleration from 0-60 mph was achieved in approximately 8.4 seconds, making it competitive with other mid-size SUVs of the era. However, compared to V8-powered Envoy models, the inline-six felt less powerful, particularly when fully loaded or towing. The four-speed automatic transmission, while reliable, contributed to a noticeable lack of responsiveness during quick acceleration. Gear ratios were tuned for a balance of fuel economy and towing capability, rather than outright performance. The rear-wheel-drive configuration provided a more engaging driving experience than some of its competitors, but also meant reduced traction in inclement weather without the optional four-wheel-drive system.
Equipment & Trim Levels
The Envoy II XL 4.2i typically came standard with features such as air conditioning, power windows and locks, a CD player, and cloth upholstery. Higher trim levels, such as the LT, added features like leather seats, heated front seats, a premium sound system, and alloy wheels. Optional extras included a sunroof, rear-seat entertainment system, and a navigation system. The interior design was functional and relatively spacious, offering comfortable seating for up to seven passengers. The third-row seats were best suited for children or shorter adults.
Chassis & Braking
The GMT370 platform utilized a body-on-frame construction, providing a robust and durable chassis. The front suspension consisted of an independent double wishbone setup, while the rear suspension employed an independent multi-link design. This suspension configuration aimed to provide a comfortable ride while maintaining reasonable handling characteristics. The Envoy II XL 4.2i featured ventilated disc brakes at the front and solid discs at the rear. Anti-lock braking system (ABS) was standard, enhancing safety during emergency braking situations. The steering system was a hydraulic rack-and-pinion setup, offering responsive and precise steering control.
Market Reception & Comparison
The GMC Envoy II XL 4.2i was generally well-received by critics as a capable and versatile SUV. However, the 4.2-liter engine was often criticized for its lack of refinement and fuel economy compared to some of its competitors. The V8-powered Envoy models offered significantly more power and towing capacity, making them a more attractive option for buyers prioritizing performance. The 4.2i offered a more affordable entry point into the Envoy II lineup, appealing to budget-conscious buyers who didn’t require the extra power of the V8. Fuel economy averaged around 17 mpg combined, which was typical for a mid-size SUV of that era, but lower than some of the newer crossover SUVs entering the market.
Legacy
The LL8 4.2-liter inline-six engine proved to be a relatively reliable powerplant, although it was prone to oil leaks as it aged. The 4L60-E transmission was also generally durable, but required regular fluid changes to prevent premature failure. Today, the Envoy II XL 4.2i can be found on the used car market at relatively affordable prices. While it may not offer the latest technology or fuel efficiency, it remains a capable and practical SUV for those seeking a rugged and reliable vehicle. Its simplicity and relatively low maintenance costs make it an appealing option for those looking for a dependable transportation solution.
