Hello All,

I've been lurking for a while, and I do appreciate everyone's input here, a real trove of information!! I'll get right down to it, I recently put a wideband O2 sensor on my bone stock 2004 5.4L Screw, and discovered something very interesting, the truck runs at 14.7 at WOT instead of 12.5-13! I confirmed this by logging the narrow band O2 sensors and found they are oscillating per usual instead of going full rich at WOT, see below. I have an edge tuner and changing the WOT multiplier did nothing.

Can anyone tell me if they have experienced the same thing and if they were able to get the truck to run at 13:1 with an Edge tuner?

Thanks!
Frank