Found another idle scan with 174° So I would mess with idle then immediately scan and drive. I'd look at logs and see it increasingly going lean because of the high IAT's. I'd pull fuel then quit till next day. 2nd day I take it for a scan without doing an idle scan, and boom my car is rich. Rinse and repeat. For two weeks...Dang I'm an idiot. So here's my rookie mistake. I wasn't paying attention to my IAT because I only equated that with the spark table that only pulled a degree or two of timing max. I stupidly overlooked the fact that hot air is less dense which means less O2.
Which means leaner, which means hotter, which means leaner.... I have heard leaner doesn't always mean hotter though. Though maybe I'm wrong about that.
