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Slight rattle only on acceleration/load

somerset9

Go Kart Newbie
Location
Los Angeles
I've been noticing a slight rattle (metal on metal) on acceleration. Most prominent on highway speeds between 2200-2800 RPM. I'm not sure if the sound goes away above/below that becauuse SMF, poly mounts, and a cat back gets loud outside normal highway cruising RPMrange.

No engine codes besides a knock sensor code I cleared and has yet to reappear. Oil, cam follower, fuel filter, spark plugs all done within last 4 months/4k miles.

I'm hoping it's just a random rattle but the fact it goes away while I'm off the pedal makes me think it's engine related. Maybe wastegate actuator? Hopefully not the cam chain. What can this be?
 
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