Pass side O2 reading false lean, thus running pig rich!
10-10-2011, 07:38 PM
#1
Pass side O2 reading false lean, thus running pig rich! Have tried both Bosch and AC Delco O2 in this bank, new O2 will run great for a while, then start dropping voltage, telling the PCM to dump fuel, wideband pegging at 9.7 in cruise and fuel trim is +25 lean on that bank. I found the wires burned, so I cut and soldered them back together, only to now have the same problem, 9.7-9.8 AFR and reading max lean fuel trim on the pass bank O2. What can I do to test the wiring voltage and see if the new O2 is good or bad now that I've soldered the wires back together?
10-11-2011, 02:34 PM
#4
Heads/cam, no misfire that I am aware of, before I found the burnt wires yesterday I replaced all of the plugs, and all of the old ones looked exactly the same. No header leak that i can hear or see. I haven't tried a new sensor since repairing the wires, is it possible the sensor went bad before repairing the wires? BLM is maxed at 160 or +25 on the pass bank, reading fine on the left bank.
10-11-2011, 02:46 PM
#5
Heads/cam, no misfire that I am aware of, before I found the burnt wires yesterday I replaced all of the plugs, and all of the old ones looked exactly the same. No header leak that i can hear or see. I haven't tried a new sensor since repairing the wires, is it possible the sensor went bad before repairing the wires? BLM is maxed at 160 or +25 on the pass bank, reading fine on the left bank.
10-11-2011, 02:55 PM
#6
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