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pbp1 · 07-31-2015, 11:44 AM

No matter where you have the sensor mounted, the two step is skewing your readings. Misfires are always read as lean on the O2 sensor. I dont know exctly why but they do. What has helped me the most is looking at what the A/F ratio does immediately after you let go of the button. If it dives really rich, that tells you it was rich when it was on the 2 step. If it stays lean after you let go of the button, it was lean on the 2 step.

07-31-2015, 11:44 AM	#9
pbp1 Junior Member Join Date: Mar 2013 Posts: 80 Likes: 12 Liked 27 Times in 6 Posts	Re: A/F Ratio No matter where you have the sensor mounted, the two step is skewing your readings. Misfires are always read as lean on the O2 sensor. I dont know exctly why but they do. What has helped me the most is looking at what the A/F ratio does immediately after you let go of the button. If it dives really rich, that tells you it was rich when it was on the 2 step. If it stays lean after you let go of the button, it was lean on the 2 step.