Many Ford enthusiast and car repair sites post detailed specifications for the engines used in the Ford F-150 series of pickup trucks that include the spark plug firing order of the cylinders. The precise firing order varies from engine to engine, however, so it is important to determine the engine used in a specific F-150 to determine which engine's information applies to that truck.
Firing orders define the sequence in which the spark plugs in an engine are triggered during one complete cycle of all the pistons in the engine. For example, the five-liter Coyote V-8 engine used in many F-150 pickups from 2010 to 2015 has a firing order of 1-5-4-8-6-7-2; the first cylinder is closest to the front of the truck on the right when facing the front of the vehicle. Cylinder numbering schemes also may vary between different engines, so it is important to know both the firing order and cylinder numbering scheme for a given F-150 engine.
The firing order of an engine is important for purposes of engineering characteristics such as the engine's noise levels and vibrations when operating. It is also important to know the firing order when tuning or repairing an engine, as the engine's spark plugs must be wired to the correct ports on the engine's distributor cap to maintain the firing order. Wiring the spark plugs in the incorrect order can cause performance problems and potentially damage the engine.