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I have cm871 eng build was 2007. My current calibration on the ecm is AV10068.46 but on the engine data plate it says AV10064. Shouldn't the ecm read the same number? In insite when comparing the calibrations doesn't show much difference between the two, only difference is in the hp @ rpm.

this may help...
http://rawze.com/forums/showthread.php?tid=1&pid=1#pid1

Wow, that's great info. I should definitely put the AV10064 calibration on my ecm instead of leaving AV10068 on it.

So could damage have already been done because my ecm doesn't match the data plate? I think the ecm has been on AV10068 as far back as I can remember.