The Chevrolet Impala VIII (W), specifically the 3.4 i V6 variant producing 182 horsepower, represented a significant return to form for Chevrolet’s full-size sedan. Produced from 1999 through 2006, this generation Impala aimed to recapture the spirit of the classic Impalas while offering modern comfort and convenience. Positioned as a mid-range offering within the Impala lineup, it slotted between the base 3.4L V6 and the more powerful 3.8L Series II V6 models. The Impala VIII was built on the GM W-body platform, shared with other GM vehicles like the Buick Regal and Pontiac Grand Prix, and was a key player in Chevrolet’s attempt to regain market share in the large sedan segment.
Technical Specifications
| Brand | Chevrolet |
| Model | Impala |
| Generation | Impala VIII (W) |
| Type (Engine) | 3.4 i V6 (182 Hp) |
| Start of production | 1999 |
| End of production | 2006 |
| 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) | 7.4 l/100 km (31.8 US mpg) |
| Fuel consumption (combined) | 8.7 l/100 km (27 US mpg) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 10 sec |
| Acceleration 0 – 62 mph | 10 sec |
| Acceleration 0 – 60 mph | 9.5 sec |
| Maximum speed | 180 km/h (111.85 mph) |
| Weight-to-power ratio | 8.2 kg/Hp |
| Weight-to-torque ratio | 5.4 kg/Nm |
| Power | 182 Hp @ 5200 rpm |
| Torque | 279 Nm @ 4000 rpm (205.78 lb.-ft. @ 4000 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | LA1 |
| Engine displacement | 3350 cm3 (204.43 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Cylinder Bore | 92 mm (3.62 in.) |
| Piston Stroke | 84 mm (3.31 in.) |
| Compression ratio | 9.6:1 |
| 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 capacity | 10.7 l (11.31 US qt | 9.41 UK qt) |
| Kerb Weight | 1500 kg (3306.93 lbs.) |
| Trunk (boot) space – minimum | 525 l (18.54 cu. ft.) |
| Fuel tank capacity | 65 l (17.17 US gal | 14.3 UK gal) |
| Length | 5080 mm (200 in.) |
| Width | 1855 mm (73.03 in.) |
| Height | 1455 mm (57.28 in.) |
| Wheelbase | 2805 mm (110.43 in.) |
| Front track | 1575 mm (62.01 in.) |
| Rear (Back) track | 1555 mm (61.22 in.) |
| Drivetrain Architecture | 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 |
| Power steering | Hydraulic Steering |
| Tires size | 225/60 R16 |
| Wheel rims size | 6.5J x 16 |
Powertrain & Engine Architecture
The heart of the Impala VIII 3.4 i was the LA1 3.4-liter (204.43 cubic inch) V6 engine. This engine was a 60-degree V-engine, utilizing a cast iron block and aluminum cylinder heads. It featured a two-valve-per-cylinder configuration and a multi-port fuel injection system, delivering a balance of power and efficiency. The LA1 engine was known for its relatively simple design and robust construction. Paired with this engine was a 4-speed automatic transmission (typically the 4T65E), chosen for its smooth operation and ease of use. This transmission was a common choice for front-wheel-drive GM vehicles of the era. The automatic transmission was a key factor in the Impala’s appeal to a broader audience, particularly those seeking a comfortable and convenient driving experience.
Driving Characteristics
The 182 horsepower and 205 lb-ft of torque produced by the 3.4L V6 and 4-speed automatic combination resulted in adequate, but not exhilarating, performance. Acceleration from 0-60 mph took around 9.5 seconds, making it competitive with other large sedans of the time. The automatic transmission was tuned for comfort, with relatively relaxed shift points. This resulted in a smooth ride but could sometimes feel sluggish during quick acceleration or overtaking maneuvers. Compared to the higher-output 3.8L V6 Impala, the 3.4L felt noticeably less powerful, especially when fully loaded with passengers and cargo. However, the 3.4L offered better fuel economy than its more powerful sibling.
Equipment & Trim Levels
The 3.4L Impala typically came standard with features like air conditioning, power windows and locks, a CD player, and cloth upholstery. Higher trim levels, such as the LS, added features like alloy wheels, upgraded audio systems, and leather upholstery. Optional extras included a sunroof, heated seats, and a remote keyless entry system. The interior design was generally conservative, focusing on comfort and practicality rather than sporty aesthetics. The dashboard layout was straightforward and easy to use, with clearly labeled controls.
Chassis & Braking
The Impala VIII utilized an independent front suspension with coil springs and a multi-link rear suspension, providing a comfortable ride. The front brakes were ventilated discs, while the rear brakes were typically discs on later models, though some earlier models featured rear drums. Anti-lock brakes (ABS) were standard equipment. The suspension was tuned for a balance of ride comfort and handling, prioritizing a smooth and quiet driving experience. Stabilizer bars were included at both the front and rear to reduce body roll during cornering.
Market Reception & Comparison
The Impala VIII 3.4L Automatic was generally well-received by critics as a comfortable and practical family sedan. However, it was often criticized for its lack of sporty handling and its relatively modest performance compared to some competitors. Fuel economy was considered average for its class. Compared to the 3.8L V6 Impala, the 3.4L offered a lower price point and slightly better fuel efficiency, making it an attractive option for budget-conscious buyers. The 3.4L also proved to be a reliable powertrain, with relatively few reported issues.
Legacy
The Chevrolet Impala VIII 3.4L V6 Automatic has become a popular choice among used car buyers seeking an affordable and reliable full-size sedan. The LA1 engine is known for its durability, and the 4T65E transmission is generally considered to be a robust unit. While not a performance standout, the 3.4L Impala offers a comfortable ride, spacious interior, and a reputation for dependability. Parts availability remains good, making it relatively easy and inexpensive to maintain. Today, these Impalas represent a nostalgic reminder of a time when large, comfortable sedans were a staple of American roads.
