How are cylinders numbered on a 3.0 liter engine for 2004 ford ranger?

The 2004 Ford Ranger 3.0L engine (a Vulcan V6) uses a passenger-side-first firing order and cylinder numbering system. This means the cylinder closest to the passenger side of the vehicle is #1. They are numbered sequentially from front to back, then alternating sides.

Therefore, the numbering is typically as follows:

1. Passenger side, front

2. Driver side, front

3. Passenger side, middle

4. Driver side, middle

5. Passenger side, rear

6. Driver side, rear

It's always a good idea to double-check your specific engine, however, using a diagram found in a repair manual or online (searching for "2004 Ford Ranger 3.0L engine diagram") for visual confirmation.