Which plug is the number 1 firing on a jeep 4.0 is it the front or rear of engine?

On a Jeep 4.0 engine, the number 1 cylinder is located at the front of the engine, which means the corresponding spark plug is also at the front. The firing order for the 4.0 is 1-5-3-6-2-4, with the cylinders numbered from front to rear. Therefore, the spark plug for cylinder number 1 is the first one you’ll encounter at the front of the engine.