firing order
 

i need the firing order for a 2001 F250 super duty. I can't figure out which one is number one

What engine?

If it's a gasser, cylinder # 1 is on the passenger side front, #2 is right behind it, all the way back to #4 on a V8, or #5 on the V10.

For the V8 #5 is the front driver's side, going back to #8.

For the V10, #6 is the front driver's side, going back to #10.

For instance, for a V8, looking from the front of the truck,

4-8
3-7
2-6
1-5

Or V10:

5-10
4-9
3-8
2-7
1-6

V10 firing order is 1-6-5-10-2-7-3-8-4-9 - no idea what the V8 is ;)

Firing order:
5.4L V8
1-3-7-2-6-5-4-8

7.3L V8
1-2-7-3-4-5-6-8

The diesel cylinders are numbered different. The #1 cylinder is on the front left and the #2 cylinder is on the front right. #3 is the second cylinder back from the front left and the #4 is the second cylinder fron the front right, etc.

7-8
5-6
3-4
1-2