I have attached a log from a short drive where nothing major happened (except maybe one good stretching of the legs).
I see scattered bits of KR here and there and they are from varying cylinders.
I have stock timing tables and use 93 pump gas from Shell that very, very consistently measures 10-10.5% ethanol, as measured by my 2004 Flex-Fuel Tahoe.
I do have headers and a 3" exhaust that is louder than OEM.
My gut tells me this is not knock, but the noise setting the sensors past their threshold.
But I don't want to desensitize the sensors if the knock is real.
Before I go trying to adjust the timing tables any (I was hoping to advance them some to gain some power), I want to rule out this knock.
Race fuel source is about an hour away.
How about some octane boos additive? Will that definitively help me rule out if the knock is real?
(I need to make T-Shirts, "The Knock is Real")
I would greatly appreciate suggestions on how to proceed, safely, on my path to spark adjustment.
Thanks in advance.