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there are two firing orders, one for the v8 3.9 engine and then for all other v8 engines, if you stand in front of the truck with hood open and engine in front of you, this is the order, on your left starting at the front on engine it will be cylinder #1 then #2,#3#4 going back. then on your right startint at the front is cylinder #5,#6,#7,#8.
http://autorepair.about.com/od/enginefiringorders1/
4.0L SOHV Firing Order
Firing order for the 4.0 liter SOHV V6 is
1-4-2-5-3-6
http://autorepair.about.com/od/enginefiringorders1/
5.0L Firing Order
Firing order for the 5.0 liter V8 is
1-3-7-2-6-5-4-8
http://autorepair.about.com/od/enginefiringorders1/
How to Find the Cylinder Order V6
When standing in the front of the vehicle the cylinders are numbered 1-3 up the passenger's side and 4-6 up the driver's side.
How to Find the Cylinder Order V8
When standing in the front of the vehicle the cylinders are numbered 1-4 up the passenger's side and 5-8 up the driver's side.
For the 1984 Ford F150: I do not know if you have the 4.9L In-Line (Straight) 6-Cylinder, the 5.0L V8, or the 5.8L V8; however I have included all below.
For the 4.9L In-Line 6-Cylinder: Firing Order 1-5-3-6-2-4 Cylinders: (back)
...6
...5
...4
...3
...2
...1 (front) Distributor:
...........4
.....2 [].............1
..6.............[]-clip
.............5
.....3 Rotation: Clockwise
For the 1998 Ford Econoline Van: I do not know if you have the Econoline E150, E250, E350 Model; or the 4.2L V6, 4.6L V8, 5.4L V8, or the 6.8L V10 Engine; however I have included all below.
For the 4.2L V6: Firing Order: 1-4-2-5-3-6 Cylinders: ......(back)......
|..3..|.......|..6..|
|..2..|.......|..5..| |..1..|.......|..4..|
......(front)
How to Find the Cylinder Order V6
When standing in the front of the vehicle the cylinders are numbered 1-3 up the passenger's side and 4-6 up the driver's side.
How to Find the Cylinder Order V8
When standing in the front of the vehicle the cylinders are numbered 1-4 up the passenger's side and 5-8 up the driver's side.
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