xxxhp

See my location. Our cars do not come with O2 sensors in the exhaust & our PCM version is not programmed to receive any output from O2 sensors. When I select any parameter in Autotap with regard to the O2 sensors I just get 0.

Iam trying to have an idea of what my A/F ratio is. I do know that the A/F ratio item in Autotap does not mean the actual A/F ratio. Is wideband dyno my only choice or is there a way to figure out something about the A/F ratio from Autotap?

TIA <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

<small>[ January 30, 2003, 06:32 AM: Message edited by: xxxhp ]</small>

Tim Sloper

You can not determine A/F ratio from AutoTap or any other OBD-II scan tool. You may be able to infer whether you are extremely rich or extremely lean but that is about the extent to which you will be able to gather any useful data. Our O2 sensors are only accurate around a 14.7 A/F ratio. The output of the sensor is also very dependent up its operating temperature.

Tim

MIGHTYMOUSE

iTrader: (59)

you can install an air'fuel ratio gauge like from autometer etc.

use this with an o2 sensor you install close to the manifolds as you can.

this will give you a good idea of whether you are overly rich or overly lean, but its not accurate enough to do more than that with.. you would need a wideband for that


if you could get the o2 sensor wired into the computer so that it would be picked up by a-tap then you could tune some with it, because you have specific numbers logged. though its not the best way (As above) it is the most used way here online to get 'close'