Quote:
Originally Posted by Hyperblue302
Well I'm a complete noob when it comes to this tuning. I think I understand something, then the next day I read something else on here and it changes. The wild ltft swings I was experiencing have gone away. When I put my header on I couldn't get the secondary o2 sensor out. I was able to do that yesterday and installed it. I thought I could just clear codes and be fine without it, but reinstalling the 2nd o2 has fixed what I was chasing. No more wild AFR swings. Without the 2nd o2, I also noticed my car would go into open loop at 10% throttle every time , and my idle aft would slowly drop in the 12's and stay there while idling. I thought it was the maf sensor scaling, but now the trims and AFR are acting better now.
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While the primary 02 sensor is used for fuelling, the secondary 02 is also used for some cruise correction cat efficiency and likely some other stuff.
Unless you get into the tune and disable a whole heap of stuff your going to need the secondary 02 sensor working and connected else all sorts of weird stuff, like you found, will happen.