What are the cylinder numbers on a 1999 F150 4.2 L?
The firing order for a 1999 Ford F-150 with the 4.2L V6 engine is 1-5-3-6-2-4. However, the cylinder numbering itself isn't directly sequential from front to back. You'll need to consult a repair manual or a diagram specific to that engine to see the physical location of each cylinder number. The numbering is typically stamped on the engine block itself, but it can be difficult to see.