Where is spark plug number one on a 2005 ford f150 5.4 liter engine?

On a 2005 Ford F-150 with the 5.4L Triton V8 engine, cylinder #1 spark plug is located on the passenger side, front of the engine. It's the closest plug to the front of the vehicle on that side.

However, it's crucial to double-check your engine's firing order, which should be printed on a sticker under the hood or in your owner's manual. The location of #1 cylinder can sometimes be slightly different based on minor engine variations within the model year. Always refer to the official documentation to be certain.