What do you have your base PE afr set at? It's richening up the whole time you are at 100% throttle, but its way to lean. Pull out 2% from your MAF table below 4000htz, then only 1% between 4000-5500, then add yourself 1% from 5500 and up. Don't adjust timing, and figure out what throttle percent you are at when you see your O2's drop off....probably around 32% or so.
If that doesn't cure it, set your PE AFR to 10.8 and see if that makes it run fat, if that does the trick, see if you can get it up to 11.5. It won't take much to make the O2's come up, but I would pretty much rule out 2 bad sensors in a row.
Originally Posted by Reptile
