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Originally Posted by DoctorDex
I'm also wondering if this issue of "spark blow out" on my rear bank is related. I've never had issues, to this degree, with spark blow out. At WOT, my rear o2 voltages are dropping to 0.60V between 4600-6000rpm and then they go back to 0.91V from 6000rpm - 8200rpm. Like I said before, it doesn't feel like spark blow out and the o2 voltages aren't bouncing around. However, I have noticed that my timing will start zig zagging a bit in the 4600-6000rpm range when it is blowing out. The strangest part about it all, is that if I do back to back runs, on one run it'll bounce between 0.89-0.91V and the next it drops all the way down to 0.60V.
Declan
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I had a similar issue with the my front o2 going very lean at those rpm points, but I never dared pushing it above 6000rpms. My problem turned out to be the coils on the front bank.