Where is number 3 plug on a 5.4 ford engine?
There isn't a universally numbered "plug 3" on a 5.4L Ford engine. The firing order and therefore the plug locations vary depending on the specific year and configuration of the engine (2V, 3V, etc.). You'll need to consult a wiring diagram or a repair manual specific to your engine's year and model to find the location of each spark plug. These diagrams will show the firing order and the corresponding cylinder locations.