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yes im sure its knock, the knock sensors are pretty reliable. At cruising 2500 rpm if i back off 2-3* the pinging stops at 17-18:1 AFR. idle i can go 15.6:1 with no issues due to AVLS low lift mode. but i like smooth buttery idle at 14.7:1. anyway i can run 16.2:1 afr at very advanced timing but anything leaner requires timing retard.
currently 16:1 afr at 2500 rpm or 60mph at 40* timing with no EGR. with egr i can add 5-6* without knock.
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