Could some one familiar with Snap-on scanner cyl. contribution values give me an interpretation of these numbers. They were taken about one minute after cold start, ambient temp. about 55f. Cyl. #1 @ 1, #@ @ 0, #3 @ 0, #4 @ 0, #5 @ 1, #^ @ -1, #7 @ 0, #8 @ 0. ... Login to read more.