Mine has quite a bit of knock frequently when pulling away from stop lights. If an engine has slightly loose tolerances (like mine... Most race engines are built like that) then they tend to be a bit 'noisier' as far as the knock sensor is concerned and will show some knock. It's annoying, but nothing that should be worried about. I may play with the filter on my knock sensor a bit but it will be in the future after I feel like I know tuning inside and backwards.