Vortec 5.3/6.0/LS Single Bank Fuel Control Option

[Caleditor]

I have use it many times. If it is a turbo application it will allow you to mount both O2's in a single pipe with no ill effects.

I had a car a few years back that when I had 2 bank fuel control turned off the fuel trims were close. I converted it to a 2 bar OS and they would be split again. I figured it had something to do with the COS.

I found on a bunch of cars it does not work like I expect it would. I found in a very few it does. I have gone over the calibrations in hex and found a few settings that may make it work, but I have not done further testing
If the sensors are in 1 pipe it fixes the fuel trims.

[EyesofThunder]

Was experimenting with the Dual Bank/Single Bank on my L29 454 today, no worky (I know, I have a dead right bank O2). But looking at the L30 (the 305), it is factory single bank and works (obviously or GM wouldn't have shipped it), but it also has 3rd O2 sensor checked too. I will experiment more tomorrow on it.

The other question is did GM do something like ground out the Bank 2 sensor input?

[Hog]

Was experimenting with the Dual Bank/Single Bank on my L29 454 today, no worky (I know, I have a dead right bank O2). But looking at the L30 (the 305), it is factory single bank and works (obviously or GM wouldn't have shipped it), but it also has 3rd O2 sensor checked too. I will experiment more tomorrow on it.

The other question is did GM do something like ground out the Bank 2 sensor input?

Yes the Vortec 305 has that 3rd precat O2 sensor and the single aftercat O2 sensor.
The L31 350 and L29/21 454 uses the dual precat and dual aftercat sensors.

peace
Hog

[EyesofThunder]

I tried it, still need to datalog it, but at least from what I have started with I haven't got single bank to work (even with 3rd O2 checked) on a 2000 K3500 calibration in my 99 K2500 454 Suburban.

It runs quite badly with 3rd O2 checked and no other changes.

Yes the Vortec 305 has that 3rd precat O2 sensor and the single aftercat O2 sensor.
The L31 350 and L29/21 454 uses the dual precat and dual aftercat sensors.

peace
Hog