* 1.6L Quad 4: This was the base engine, a 1.6-liter four-cylinder producing around 105 horsepower.
* 2.2L Ecotec: This was a more powerful option, a 2.2-liter four-cylinder with an output ranging from 135 to 140 horsepower.
* 2.4L Ecotec: This was a larger displacement option, offering around 150 horsepower.
* 2.0L Quad 4: This was a rarer option found in some Sunfires, providing slightly more power than the 1.6L but less than the 2.2L.
The specific engine used in a Pontiac Sunfire would depend on the model year and trim level.