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Doug Hoven · 11-30-2020, 04:47 PM

From what I understand, this era of gm cars are fitted with "narrowband" o2 sensor, and there is no direct scale from the o2 voltage reading shown by the ecu to either forms of afr. Like mentioned above, .45 volts is "stoich," and when it is around .85, that should be somewhere around 13:1.

11-30-2020, 04:47 PM	#93
Doug Hoven Member Join Date: Feb 2018 Location: Jersey Posts: 181 Likes: 171 Liked 752 Times in 146 Posts	Re: Not for Nuthin' But Close! From what I understand, this era of gm cars are fitted with "narrowband" o2 sensor, and there is no direct scale from the o2 voltage reading shown by the ecu to either forms of afr. Like mentioned above, .45 volts is "stoich," and when it is around .85, that should be somewhere around 13:1.