anyone ever dealt with some backfire type sound at part throttle drive?
only at about 35% throttle 9th or 10 gear only. seems to go straight to mapped point 25 on the spark timing.
21 gt tuned on e85? i do see vct go -20 as well would i have to adjust vct?
spark advance is aroud 10 degrees when this happens and stft around +2.
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