The 2004 Pontiac Sunfire offered two four-cylinder engines, depending on trim: a 2.2-liter Ecotec inline-4 or a 2.4-liter twin-cam inline-4.
In detail, the Sunfire’s engine choices reflected its basic-versus-performance split. Base models typically used the smaller 2.2-liter Ecotec, prioritizing efficiency and smooth everyday driving. The GT, aimed at buyers seeking more spirited acceleration, adopted the larger 2.4-liter engine. Both engines could be paired with either a five-speed manual or a four-speed automatic transmission, though availability could vary by trim and configuration. These engines are part of GM’s small-car family and were commonly used across several J-platform vehicles of that era.
Engine options and trim alignment
The two engine options are listed below with their general trim associations.
- 2.2-liter Ecotec inline-4 engine (standard in base Sunfire models)
- 2.4-liter inline-4 twin-cam engine (used in GT and performance-oriented configurations)
In summary, base Sunfires were powered by the 2.2L Ecotec, while the GT benefited from the more powerful 2.4L engine, offering a noticeable performance difference between the trims.
Transmission options
Transmission choices varied by engine and trim, with some configurations offering both manual and automatic options.
- 5-speed manual transmission (commonly paired with the 2.2L Ecotec in base models)
- 4-speed automatic transmission (available with both engines depending on equipment and market)
Transmission availability depended on the specific vehicle’s build. Checking the original window sticker or VIN details will confirm the exact setup for a given car.
Summary
The 2004 Pontiac Sunfire’s engine lineup consisted of two four-cylinder options: the 2.2-liter Ecotec for the base models and the 2.4-liter twin-cam for the GT, with both engines compatible with either a manual or an automatic transmission in various configurations. If you’re evaluating a particular car, verify the engine type from the vehicle’s documentation or underhood markings to be certain.