Other say that if one of the values is much different from others, then you have a problem. I don't think so. My values are like those: -0.42 +0.38 +0.12 +1.68. All the cam lobes are in pristine condition, compression is good because the car starts immediately after key turn, returns acceptable fuel economy based on driving condidions, doesn't smoke, has got good power.
IMO the group 13 displays the correction of the fuel injected quantity per cylinder per strike. The correction is done in order to equalize the rotation of the cam shaft.
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