This means that the cylinders fire in that order, starting with cylinder #1 and ending with cylinder #4.
Here's a breakdown:
* Cylinder #1: Front passenger side
* Cylinder #2: Front driver's side
* Cylinder #3: Rear passenger side
* Cylinder #4: Rear driver's side
* Cylinder #5: Front passenger side
* Cylinder #6: Front driver's side
Keep in mind that this information is for a standard 1985 Ford Ranger with a 2.8L V6 engine. It's always a good idea to double-check this information with your owner's manual or a reputable repair manual.