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Ok kids... my O2 delete instructions have some unintended consequences. What seemed like a logical approach, based on the knobs available, turned out to create an issue with the LTrims. I was doing some driving and logging last night and noticed bank 2 going negative on the order of 18-20%. A few days earlier both banks looked normal and tracked each other as expected. I added the O2 voltages and noticed that at idle and light loads (part throttle driving) the bank 2 O2 would rarely get above 0.1mV. My initial reaction was crap... unmetered air is getting in the exhaust stream some how on that bank. I double checked the intake manifold bolts and the manifold to cat delete flange. Everything was good. I then thought maybe I somehow damaged the O2 sensor during the swap. Then it dawned on me that a steady state of severely negative LTrim and and a low O2 voltage made zero sense. So I put my WB on that bank and it confirmed that the AFR was at stoich yet the O2 was reading way lean. This strange behavior had to be coming from the ECM. So I went and changed the O2 delete method to the old school way of just disabling the pertinent DTCs. As soon as I made the change everything fell back in to line and bank 2 started oscillating as expected.
I will post the DTC list as soon as I'm confident I've hit all of the pertinent ones. I'm letting the ECM throw the codes and changing them as needed.
Sorry for the bad info. I didn't expect it to behave the way it did. HPT exposes a lot of knobs but they don't always work as you would hope.
Tim
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