Where is the number 4 coil located at on a ford 5.4 engine?

On a Ford 5.4L Triton engine (the common type), there isn't a "number 4 coil" in the way you might be thinking. The 5.4L uses a coil-on-plug (COP) system. This means each spark plug has its own individual ignition coil mounted directly on top of it.

Therefore, coil "4" is located directly on top of spark plug number 4. To find spark plug 4, you'll need to consult a repair manual or online diagram specific to the year and configuration of your 5.4L Ford engine. The firing order will determine the location of cylinder 4, and thus coil 4.