number one, captain... but i wonder why there are two.. there isnt an extra on mine.
If you plan to pull the octane plug so you can run reg unleaded, its not worth it. Your gas consumption will go up so in the long run it'll cost you more, plus the fact you lose quite alot of power. I stripped one motor where a guy had done that, and the carbon build up was flaking off the top of the pistons.
Ford put that octange plug in to cover the times you had to drop some reg in it cause prem wasn't available where your at.
You are correct and the above response is incorrect. The Octane plug is the one with green and grey wires and is the one next to the EDIS. Both plugs will set a code but I'm not sure if they will both trigger the CEL or not.Acording to my Ford manual, the two red wire one is the SPOUT. I've been running with the OTHER one out and it did NOT set a code. I believe if I was running w/o SPOUT, I,d get a SES light.