1-4-2-5-3-6
* The firing order is the sequence in which the spark plugs fire in the engine.
* The firing order is determined by the design of the engine, and it is important to follow the correct firing order when replacing spark plugs or performing other engine repairs.
* The firing order for the 1998 Ford Explorer with 4.0L SOHC engine is 1-4-2-5-3-6. This means that the spark plug in cylinder 1 fires first, followed by the spark plug in cylinder 4, then the spark plug in cylinder 2, and so on.
