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My stock engine has tip-in knock under certain conditions. I haven't yet caught it on logs but hope to on my next highway trip. It only happens during a long cruise when I apply throttle too quickly after a long period of mode-4 (fuel cut) operation, for instance, like leveling out after a long downhill.
It's really disturbing so I've learned to apply throttle slowly in those cases. Sometimes I forget. The sound is soul-crushing.
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