Yeah, that leaning out at tip-in drove me crazy. Look at the commanded LAMBSE in the datalog below:
I ended up forcing the ECU to go open loop sooner to stop the lean bog. I'd love to know the real reason for this behavior. Adjusting the MAF a dozen times did nothing except change whether the KAMRF's were above or below 1. For a moment I thought EGR - except mine is turned off. There is an answer to this - I just don't know what it is yet...
