Heads up I'm a complete newbie at tuning. I have a GTO that I am playing with the tune. I had it dyno tuned after headers were installed and it's been running well for a couple years. I wanted to learn to tune before I put in a new cam so if I screwed it up I could reflash the old tune. So I am currently working on calibrating the MAF. I have it in open loop, DFCO off, it's forced into only MAF, etc. I reflashed on a cold engine and then went for a 30 minute drive to do some data logging and everything went smooth. I then pulled into a parking spot and let it idle while I reviewed my logs. Over about 15-20 minutes of idling my Injector Tip Temp began climbing from 149 to 180+ and at the same time my car began to run richer and richer at idle all the way to 0.8 lambda. This seems to correspond with the offset injector temp table. I've read several of the threads pertaining to injector tip temp but from my understanding a lot of the issues were when reflashing on a hot engine where the ECM grabs ECT to populate tip temp which causes a rich after flash. This was not my issue as I flashed a cold engine and it was not running rich until 40 minutes later when I parked and let it idle. I have stock injectors so I'm assuming this I would not need to recalibrate the offset vs injector tip temp.
My question is, how is my ecm calculating injector tip temp. After the reflash did it lose data where now it is calculating the tip temp inaccurately? Also, could this have always been the case but my STFTs were correcting the rich condition at idle. I just installed the wideband so I do not know if my car kept running richer and richer at idle on the original tune from the shop. My ECT and IAT were all fairly normal and nothing else was running hot. For what it's worth I live in S. Florida and it was 90+ out. Once I started driving again my ITT started coming back down and my car started to run closer to stoic again.