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Very interesting...The way I'd explain it is that the first time around the DME reduced timing to prevent knock and see if it'd knock...it didn't..so at the end of that run the DME figured last timing curve went up to 8-9 no knock and on the next run it started on 9 and left it there ... Had it knocked on this second run I think on the third run, if you did one, it'd drop from 9 to 6-6.5 again to try knock free..
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