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Weird knock issue w/ log

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blizz99

blizz99

15+ Year Contributor
1,010
11
Sep 21, 2005
Zeeland, Michigan
A buddy and I were doing some tuning and I suddenly get knock at around 3500 rpm so I let off. I've done everything to try to chase the issue. Attached is a log of that run and everything seems ok. I'm stumped and don't know what else to check.:confused: Also, it does it if I free rev it. If I ease the throttle it wont knock but if mash the throttle it'll knock.
 

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