Air/Fuel mix experts needed. Options

[malcolm2]

Hey hey... I need some suggestions. I went for a nice drive last nite. I have a AFR gauge that has not been working. But the PLX Devices system has a blue tooth transmitter so i can review the live data on my phone.

I was getting 10.5 A/F reading. It did jump to 12.5 as i went to neutral and coasted to a stop.

To start with, I was thinking i would pull the sensor and take a look, maybe clean it up and re-drive.

Any ideas about the 1st steps? The car seemed to run fine.

I will need to look them up here, but years ago I had a reply from, I believe, Mark Henry that gave me the following:

13.5-12.9 while accelerating of climbing
12-8-12.5 at WOT
16-17 going downhill or decelerating.

1911 cc L-Jet. I did tweek the AFM back in the day. 62,000 miles ago.

the link to the 5 page post from 2017

[emerygt350]

Not sure what brand of gauge you have but my auto meter is super picky about rich mixes and just sits there and wags at me when I am running too rich or if it doesn't like the voltage it's getting. It also does that when my cheap O2 sensors get tired.

I shoot for the numbers JamesM posted. I am getting pretty good at Djet, but no clue on ljet. 13.5 at idle really does seem like the sweet spot for a strong reliable idle. At cruise I use advance (and now I have a bluetooth 123 so I am having fun with pushing the numbers around), and like it to sit around 16.