* Check the Vehicle Identification Number (VIN): The VIN, located on the dashboard (visible through the windshield) and on the driver's side doorjamb, contains information about the engine. You'll need to decode the VIN using a VIN decoder (many free online tools are available) to find the engine code. The engine code will tell you definitively whether it's a 4 or 6 cylinder.
* Look at the engine itself: Open the hood and look at the engine. A 4-cylinder engine will have four cylinders arranged in a row, while a 6-cylinder engine (in a Corsica) will also be inline, but with six cylinders. Counting the cylinders is the most straightforward method. You'll also find a sticker on the engine itself, that might identify the engine displacement which will show you if it's a 4 cylinder or 6 cylinder engine.
* Check your owner's manual: If you have the original owner's manual, it will specify the engine type for your specific vehicle.
* Check the registration or title: Your vehicle registration or title might list the engine size (e.g., 2.2L for a 4-cylinder, 2.8L for a 6-cylinder — although a 3.1L V6 was also available). While not explicitly stating "4-cylinder" or "6-cylinder", the displacement is a strong indicator.
The VIN method is the most reliable. The visual inspection is the next best option, but requires some familiarity with engines.
