Anyone know what happens when you disconnect just one O2 sensor?
08-12-2008, 03:42 PM
#1
Anyone know what happens when you disconnect just one O2 sensor? My Turbo hotside configuration has the passenger side stock NB (Narrow Band) O2 sensor in the log manifold while the drivers side NB is in the down pipe. This means that the drivers side O2 sensor is redundantly reading the passenger side plus any feedback the drivers side bank of cylinders is providing. At the very least, this setup has the potential to read inaccurately. So, I'm wondering what the best solution would be...
1. Weld on a second O2 bung on the down pipe and transfer the passenger side NB O2 to it.
2. Piggy back the passenger side O2 wires to the drivers side O2 sensor (methinks the PCM would not like this)
3. Simply disconnect the passenger side O2 Sensor connector and let the PCM determine fueling from that single source.
1. Weld on a second O2 bung on the down pipe and transfer the passenger side NB O2 to it.
2. Piggy back the passenger side O2 wires to the drivers side O2 sensor (methinks the PCM would not like this)
3. Simply disconnect the passenger side O2 Sensor connector and let the PCM determine fueling from that single source.
08-12-2008, 06:20 PM
#5
12 Second Club
iTrader: (10)
Join Date: Sep 2005
Location: From Ohio now in that state up north
Posts: 948
Received 0 Likes
on
0 Posts
open loop tune if your not running both o2s its going to stay in open loop any way and not having one narrow band on each bak will drive fueling crazy.
08-12-2008, 07:29 PM
#6
Okay. I'm back. It looks like the Pcm either just stayed in Open Loop or the single O2 in the passenger side commanded fuel. Either way, the Wide Band O2 read damned near perfect for the 10% Ethanol/Gas I'm running. 13.8 to 14.1 during cruise. 11.5 during boost.
08-12-2008, 07:40 PM
#7
Exactly what I was trying to prove. With one NB in the right setting (passenger side) and other NB post turbo AND reading Oxygen content from the passenger side intermixed with the drivers side Oxygen content, it must have been causing the PCM to furiously try to juggle lean then rich and back again. The Wideband would show the A/F bouncing extremely rapidly at every point between 14.x to 17x during cruising. Now it stays relatively stable at high 13.x to 14.1 with subtle changes during the same cruise rpm/mph. Before, it was always bucking at steady throttle because of lean or rich misfire, I suppose from the PCM trying to rectify the disparity of the two NB O2 Sensors.
Trending Topics
08-13-2008, 08:56 AM
#8
If bryan sends me over your efilive stock tune, i can modify os code to just make the ecm use just 1 o2 sensor and then it will just blend the correction for both banks. Then he would just have to put in your changed tables again and then you just run 1 driverside o2.
