I am trying to figure out why the VCM is commanding more timing than my main spark advance table in a particular spot.
The lean spot at 4000rpm is what I'm talking about. It happens every run, in the same spot, and I can't figure out why. My main advance table only commands ~26 degrees, yet the VCM is doing 29º. The TPS reading dips, knock retard goes into effect, and there's a lean spot in the reading. I am really struggling to figure this one out. Can anybody help? Attached is a log of my drive home. Around frame 835 you can see a 2nd gear pull starting from 3500rpm. I just don't understand why everything gets really screwy around there.
Yes, I realize my AFR needs to be cleaned up under 4500rpm. I ran out of time Monday night.