On a 2000 Lincoln Town Car (which uses a 4.6L V8 engine), the firing order is typically 1-5-4-8-2-6-3-7. Therefore, cylinder #4 is located on the
passenger side, towards the rear of the engine. It's important to note that "rear" is relative to the direction of travel.
However, always double-check your engine bay against a diagram specific to your vehicle's year and model to be absolutely certain. A repair manual or online diagrams (searching for "2000 Lincoln Town Car engine diagram") can provide a definitive visual confirmation.
