The Chevrolet Impala IX, specifically the 3.9-liter V6 variant paired with a four-speed automatic transmission, represented a significant offering in the full-size sedan segment during its 2006-2011 production run. This iteration of the Impala, part of the ninth generation (2006-2020), aimed to provide a balance of spaciousness, comfort, and respectable performance for American families. Positioned as a mid-range option within the Impala lineup, it slotted above the base 3.5-liter model and below potential fleet-focused trims. The Impala IX was a key model for Chevrolet, continuing a nameplate with a long and storied history in the American automotive landscape.
Technical Specifications
| Brand | Chevrolet |
| Model | Impala |
| Generation | Impala IX |
| Type (Engine) | 3.9 V6 (245 Hp) Automatic |
| Start of production | 2006 |
| End of production | 2011 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 11.8 l/100 km (19.9 US mpg) |
| Fuel consumption (extra urban) | 8.1 l/100 km (29 US mpg) |
| Fuel consumption (combined) | 10.2 l/100 km (23.1 US mpg) |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 6.9 kg/Hp (145 Hp/tonne) |
| Weight-to-torque ratio | 5.2 kg/Nm (194.1 Nm/tonne) |
| Power | 245 Hp @ 6000 rpm |
| Power per litre | 63.1 Hp/l |
| Torque | 328 Nm @ 4400 rpm (241.92 lb.-ft. @ 4400 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | LZ8 |
| Engine displacement | 3880 cm3 (236.77 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 |
| 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 | 1690 kg (3725.81 lbs.) |
| Trunk (boot) space – minimum | 527 l (18.61 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 | 1586 mm (62.44 in.) |
| Rear (Back) track | 1562 mm (61.5 in.) |
| 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 | Spring Strut |
| Rear suspension | Coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 225/55 R17 |
Powertrain & Engine Architecture
The heart of the Impala IX 3.9 was the LZ8 engine, a 3.9-liter (3880 cc) naturally aspirated V6. This engine, part of Chevrolet’s V6 family, featured a 90-degree V-angle and utilized a cast iron block with aluminum cylinder heads. The engine employed multi-port fuel injection, delivering fuel directly into the intake ports, and a dual overhead camshaft (DOHC) valvetrain with two valves per cylinder. The 3.9L V6 produced 245 horsepower at 6000 rpm and 328 Nm (241.92 lb-ft) of torque at 4400 rpm. Paired with this engine was a four-speed automatic transmission (4T65E), a common and relatively reliable unit for the time. This transmission was chosen for its smooth operation and suitability for everyday driving, prioritizing comfort over outright performance.
Driving Characteristics
The 3.9-liter V6 and four-speed automatic combination delivered adequate, but not exhilarating, performance. Acceleration from 0 to 60 mph typically took around 7.5-8.5 seconds. The automatic transmission, while smooth, lacked the responsiveness of more modern gearboxes or the engagement of a manual transmission. Gear ratios were tuned for comfortable cruising and fuel efficiency rather than aggressive acceleration. Compared to the base 3.5-liter Impala, the 3.9 offered a noticeable improvement in power and responsiveness, making it more suitable for highway driving and carrying a full load of passengers. However, it didn’t match the performance of the SS model with its larger displacement V8 engine.
Equipment & Trim Levels
The Impala IX 3.9 typically came standard with features such as air conditioning, power windows and locks, a CD player with an auxiliary input jack, and cloth upholstery. 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 and practicality over luxury. The dashboard layout was straightforward, with easy-to-use controls.
Chassis & Braking
The Impala IX utilized a front-wheel-drive layout with a MacPherson strut front suspension and a multi-link rear suspension. This setup provided a comfortable ride, absorbing bumps and imperfections in the road effectively. The front brakes were ventilated discs, while the rear brakes were solid discs. Anti-lock braking system (ABS) was standard. Steering was provided by a rack-and-pinion system. The suspension tuning was geared towards comfort, resulting in a slightly softer and less sporty handling experience compared to some competitors. The standard tire size was 225/55R17.
Market Reception & Comparison
The Impala IX 3.9 V6 Automatic received generally positive reviews for its spacious interior, comfortable ride, and respectable fuel economy. Critics noted that the four-speed automatic transmission felt dated compared to newer transmissions with more gears. Fuel economy was rated at around 23.1 US mpg combined, which was competitive for a full-size sedan at the time. Compared to the base 3.5-liter Impala, the 3.9 offered a worthwhile performance upgrade. However, the 3.9 wasn’t as fuel-efficient as the 3.5, and it carried a higher price tag. Against competitors like the Toyota Avalon and Ford Crown Victoria, the Impala offered a more modern design and a more engaging driving experience, but often lacked the brand reputation and perceived reliability of its rivals.
Legacy
The Chevrolet Impala IX 3.9 V6 Automatic, while not a standout performer, remains a popular choice in the used car market due to its affordability, spaciousness, and relatively good reliability. The LZ8 engine, while not known for being particularly high-tech, proved to be durable and capable of lasting for many years with proper maintenance. Common issues include occasional oil leaks and sensor failures, but these are generally inexpensive to repair. Today, these Impalas represent a comfortable and practical option for those seeking a large American sedan without breaking the bank. The 4T65E transmission, while aging, is generally reliable if fluid changes were performed regularly. The Impala IX continues to be a recognizable and appreciated vehicle for those who remember its era of American automotive design.
