Today I had some time, so I changed my AFR for e10 from what I was using 14.22 to 14.42. Thought maybe 14.2 was a bit rich and our gas is 'up to 10% eth' according to the stations. So stock was 14.68 on my truck. I figured I would bring it up a notch since my best milage has been 16.2 and I was getting 16.5 beofre. However, maybe I was getting better because of the 'winter' fuel blend. Now summer is here we have 'summer' blend. So could be that was the difference in my economy going down some?
After I reflashed the PE Ratio change and Commanded AFR change, I noticed while I was idleing in neutral, my AFR went very lean (17's). Gave throttle and came back up, but went lean for a minute after let off. Drove fine and AFR was toggleing as usual. PE came on as usual. But when I pulled to a stop and idled, it went lean again. Did it 2 more times after a drive and coming to a stop. Is that normal until it relearns to go so lean when coming to a stop after a drive. After a minute it goes back into normal idle afr :( weird