Quote:
Originally Posted by Wepeel
I just resolved my issue (posted in the datalog review thread).
http://www.ft86club.com/forums/showp...postcount=1228
Turns out I needed a new rear O2 sensor.
Keep in mind O2 sensor voltage always reported something reasonable and there were no codes thrown, so it's possible that these things can decay and affect performance without any other indication that something is wrong. |
Did you replace with an OEM sensor? Similar to you, I've been noticing my commanded AFR trending down from ~14.7 during long drives at constant RPM. Specifically, the downward spiral starts at the 1.5 hour mark and drops ~0.3 units every 20 min thereafter. For me, my STFTs and commanded AFR haven't hit 0.0 and ~12.2 respectively, indicating open loop; however, I imagine that I'm headed for that soon enough.
I wonder why these rear O2 sensors are dying. Perhaps the altered heat transfer of the uncatted header (I have an OFH)? If so, I wonder if there are better aftermarket options for the O2 sensor?