The Chevrolet Impala IX 3.9 V6 FlexFuel Automatic, produced solely for the 2008 model year, represented a continuation of the ninth generation Impala (2006-2020). This variant occupied a mid-range position within the Impala lineup, offering a balance between performance and fuel efficiency, particularly appealing to buyers seeking a larger sedan with the flexibility of alternative fuel options. It was a key offering during a period where Chevrolet was attempting to modernize the Impala while maintaining its traditional American full-size sedan appeal. The Impala IX was built on the GM W-body platform, a design that had underpinned several Chevrolet models for over a decade.
Technical Specifications
| Brand | Chevrolet |
| Model | Impala |
| Generation | Impala IX |
| Type (Engine) | 3.9 V6 (230 Hp) FlexFuel Automatic |
| Start of production | 2008 |
| End of production | 2008 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5-6 |
| Doors | 4 |
| Fuel consumption (economy) – urban | 13.8 l/100 km (17 US mpg, 20.5 UK mpg, 7.2 km/l) |
| Fuel consumption (economy) – urban (Ethanol – E85) | 18 l/100 km |
| Fuel consumption (economy) – extra urban | 8.7 l/100 km (27 US mpg, 32.5 UK mpg, 11.5 km/l) |
| Fuel consumption (economy) – extra urban (Ethanol – E85) | 11.7 l/100 km |
| Fuel Type | Petrol / Ethanol – E85 |
| Weight-to-power ratio | 7.2 kg/Hp, 139 Hp/tonne |
| Weight-to-torque ratio | 5.2 kg/Nm, 192.7 Nm/tonne |
| Power | 230 Hp @ 5700 rpm |
| Power per litre | 59.2 Hp/l |
| Torque | 319 Nm @ 3200 rpm (235.28 lb.-ft. @ 3200 rpm) |
| Maximum engine speed | 6400 rpm |
| Engine layout | Front, Transverse |
| Engine Model/Code | LZG |
| Engine displacement | 3884 cm3 (237.02 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Cylinder Bore | 99 mm (3.9 in.) |
| Piston Stroke | 84 mm (3.31 in.) |
| Compression ratio | 9.8:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 3.8 l (4.02 US qt | 3.34 UK qt) |
| Coolant | 9.6 l (10.14 US qt | 8.45 UK qt) |
| Kerb Weight | 1655 kg (3648.65 lbs.) |
| Trunk (boot) space – minimum | 526 l (18.58 cu. ft.) |
| Fuel tank capacity | 66 l (17.44 US gal | 14.52 UK gal) |
| Length | 5091 mm (200.43 in.) |
| Width | 1851 mm (72.87 in.) |
| Height | 1487 mm (58.54 in.) |
| Wheelbase | 2807 mm (110.51 in.) |
| Front track | 1585 mm (62.4 in.) |
| Rear (Back) track | 1562 mm (61.5 in.) |
| Drag coefficient (Cd) | 0.33 |
| Minimum turning circle (turning diameter) | 11.6-12.2 m (38.06 – 40.03 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the front wheels of the vehicle. |
| Drive wheel | Front wheel drive |
| Number of gears and type of gearbox | 4 gears, automatic transmission |
| Front suspension | Independent, type McPherson with coil spring and anti-roll bar |
| Rear suspension | Independent multi-link spring suspension with stabilizer |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 235/50 R18 |
| Wheel rims size | 18 |
Powertrain & Engine Architecture
The heart of the Impala IX 3.9 V6 was the LZG engine, a 3.9-liter (237 cubic inch) V6. This engine was part of GM’s “High Feature” V6 family, known for its robust construction and relatively simple design. It featured a 90-degree V-angle, dual overhead camshafts (DOHC), and two valves per cylinder. The multi-port fuel injection system delivered fuel directly to each intake port, optimizing combustion. The engine’s ability to run on E85 fuel (a blend of 85% ethanol and 15% gasoline) was a significant selling point, offering consumers an alternative fuel option and potentially reducing emissions. The 4L60E four-speed automatic transmission was paired with this engine. This transmission was a workhorse for GM, known for its durability, but it lacked the efficiency of more modern transmissions with higher gear counts. The transmission was calibrated for smooth, comfortable shifts, prioritizing ease of driving over sporty performance.
Driving Characteristics
The 230 horsepower and 235 lb-ft of torque provided by the 3.9L V6 and 4L60E automatic combination resulted in adequate, but not exhilarating, performance. Acceleration from 0 to 60 mph was typically in the 8-9 second range. The automatic transmission’s gear ratios were geared towards cruising comfort, with a focus on maintaining low engine speeds at highway speeds. Compared to the higher-output 3.9L variants or the available 3.5L V6, this configuration felt noticeably less responsive. The 4-speed automatic, while reliable, contributed to lower fuel economy compared to newer transmissions. The FlexFuel capability did offer a slight performance boost when running on E85, but this was often offset by the lower energy density of ethanol, resulting in reduced fuel economy.
Equipment & Trim Levels
The 3.9L V6 Automatic Impala IX typically came standard with features such as air conditioning, power windows and locks, a CD player with an auxiliary input, and cruise control. Higher trim levels, such as the LT and LTZ, added features like leather upholstery, heated front seats, a premium sound system, and alloy wheels. Optional extras included a sunroof, navigation system, and remote start. The interior design was generally functional and spacious, prioritizing comfort over luxury. The base upholstery was cloth, with leather available on higher trims. The dashboard layout was straightforward and easy to use, with large, clearly marked controls.
Chassis & Braking
The Impala IX utilized an independent front suspension with McPherson struts and a multi-link independent rear suspension. This setup provided a comfortable ride, absorbing bumps and imperfections in the road effectively. Stabilizer bars were included at both the front and rear to reduce body roll during cornering. The braking system consisted of ventilated discs at the front and solid discs at the rear. Anti-lock brakes (ABS) were standard. The suspension tuning was geared towards comfort, resulting in a softer, more compliant ride than sportier sedans. The steering was power-assisted rack-and-pinion, providing light and easy steering feel.
Market Reception & Comparison
The Impala IX 3.9L V6 Automatic received mixed reviews. Critics praised its spacious interior, comfortable ride, and the availability of FlexFuel capability. However, it was often criticized for its lackluster performance, dated interior design, and relatively low fuel economy compared to competitors. Compared to the higher-output 3.5L V6 Impala, the 3.9L offered less power and acceleration. The 3.9L was generally more affordable than the 3.5L, making it an attractive option for budget-conscious buyers. Fuel economy was comparable to other large sedans of the era, but the 4-speed automatic transmission limited its efficiency.
Legacy
The 3.9L V6 and 4L60E transmission combination proved to be relatively reliable, with many examples still on the road today. The 4L60E, in particular, is known for its durability when properly maintained. However, like all older vehicles, they are prone to age-related issues such as oil leaks, sensor failures, and transmission wear. In the used car market, the 2008 Impala IX 3.9L V6 Automatic represents an affordable and spacious option for those seeking a large American sedan. Its FlexFuel capability adds a unique feature, while its simple mechanical design makes it relatively easy to maintain and repair. While it may not offer the performance or features of more modern vehicles, it remains a viable option for those seeking a comfortable and reliable transportation.
