To find the correct firing order:
1. Locate your engine code: This is crucial. Look for a stamped code on the engine block itself. It will likely be something like a letter followed by several numbers (e.g., "E4OD," but it's highly unlikely to be that one).
2. Use the engine code to find a repair manual: Once you have the engine code, consult a repair manual specific to your year and model Ford Ranger with that engine code. A Haynes or Chilton manual, or an online resource like a service manual from a reputable site, will have the correct firing order diagram. This is the most reliable way to get the right information.
3. Look for a sticker on the valve cover (less reliable): Sometimes, but not always, there might be a sticker on the valve cover showing the firing order. However, this is not a guaranteed location.
Why there's no single answer: Ford used multiple variations of the 3.0L V6 over the years, and each might have a slightly different firing order. Relying on a generalized answer could lead to serious engine damage.
Once you find the firing order (e.g., 1-5-3-6-2-4), you'll need to identify the cylinders' location on your engine (often numbered on the engine or in your manual) and connect the plug wires accordingly. Remember that the order is sequential, meaning the first plug fires first, then the fifth, then the third, and so on.
