Technical LOG REVIEW: Weird AFR Bank Issue
- Thread starter suspenceful
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Whoa - timing in Cyl5 went to zero and stayed there right before your AFR went to 20. Looks like Injector 5 could be the problem.
Hmm thats interesting then, pulling from past experience when i shifted my banks would switch running lean when shifting. Changing secondary o2s solved this for me.
What is really worrying is that your one of your banks go extremely lean going near redline. Your fuel pump low and high pressure seem to be good. Have you gotten any codes from this? Possible throttle surging when coming to a stop?
What plugs are you running? Reading on a different forum for someone that had bank1 running super lean and getting superknock codes. Their issue was resolved when swapping to new NGK 95770. For the gap, i'm not sure how much you should gap at the power level, maybe someone else more experience can chime in.
You can swap bank1 and bank2 plugs to see if it follows but at your power level, id rather just get new ones.
cyl 5 is known for noise on N54. Cyl 5 is also BANK 2. His AFR issue is in bank 1.
Like someone else said, cylinder 5 is prone to noise at high power levels. It's always dropping. I don't think it's related.
I haven't gotten any engine codes from any of this. I literally just replaced my NGK 95770 with another set of the same plugs as routine maintenance. Both gapped at 0.022" with PR ignition coils.
My tuner sent me a new flash to see if we can make any progress. Otherwise, like you said, I'll probably swap plugs and wires across banks and see if it moves.
Still haven't figured it out. I swapped primary O2 sensors and the issue stayed on bank 1. I uploaded a few different flashes from my tuner and no difference. It doesn't do it all of the time, only some of the time. So it's hard to trace down. All new plugs and wires. It's a weekend car so I'm messing with it as my motivation allows.
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