* 2.5L I4: A four-cylinder engine.
* 3.0L V6: A six-cylinder engine.
* 4.0L V6: A more powerful six-cylinder engine.
To know for certain which engine is in a *specific* 1999 Ford Ranger, you need to check the vehicle's identification number (VIN) or look at the engine bay itself. The engine size will be stamped on the engine block.