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Thread: Target Air Fuel Ratio for ScanGauge in my 97.
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Old 11-03-2019, 10:08 AM
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Black798 Black798 is offline
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Join Date: Mar 2015
Location: Bozeman, Montana
Age: 25
Posts: 917
Real Name: Phoenix
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Prior to I beleive 1999 Toyota used narrowband o2 sensors in all the 4runners. These sensors don't understand afr they only read on a 0 to 1v scale that is either rich or lean. I have an AEM afr gauge installed in my truck and I hit 14.7 afr almost immediately after startup and it hovers there untill my tune takes over in boost. Not really understanding the purpose of having a "target afr" reading on the scangauge. Also attached a graph showing how narrowband o2s read
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Target Air Fuel Ratio for ScanGauge in my 97.-narrowafr2-png 
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