Yij
Quote:
Originally Posted by theadmiral976
That is definitely a reasonable hypothesis. Now the question is whether it is worth replacing the rear O2 sensor regularly or not? Or if there is an alternative sensor available that would be more resistant to fouling and/or thermal degradation. Replacing this sensor every 20k miles is certainly not ideal. Maybe as RedFRS4me said, there might be a way to modify the maps to "silence" this phenomenon; however, I am a little wary of that fix, mainly because I am not very knowledgeable about tuning.
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With my OFT tune I added the airfuel #3 tables to my tunes and used rom raider to zero out those values. These relate to the ecu reading the secondary o2 to adjust/learn fuel which in our case, running rich open loop. With these zeroed I am no longer seeing the issue.