KNOCK reading on the S AFC differs between & day

A

Anonymous

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The knock reading on the S AFC reads almost zero going up to 4 or 5 at night when its cool.But when the weather gets hot during the day the Knock reading goes way up reaching areading of 40 is this normal or the seting is wrong
I use 98octane unleaded fuel & using a ngk platinium plug with heat range 8 ,I dont remember the ngk number
 
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