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Originally Posted by JFP in PA
Answer is simple: With the new IMS installed, there is now less "slop" in the cam drive system. The normal cam deviation values are an expression of how far off ideal the shafts are running at idle, and the deviation is caused by wear and mechanical +/- variances, etc. It is also not uncommon for an IMS bearing that is near death to cause the cam deviation values to swing wildly back and forth while the engine is at idle.
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Here are more interesting snapshots of before and after the project that show some improvement. The "Actual Angle For Camshaft" data I recorded before the project, on 9 April, and the data I recorded yesterday. The scales on the graphs are different (software auto selected) but on 9 April there was .50 degrees variance on bank 1, and after the IMS bearing upgrade there is now .30 degrees variance on bank 1. See attached files.
Jager