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You ask how the IMS can affect the timing
The timing chain that drives the cams goes around the teeth attached to the IMS (recall that the IMS is an intermediate shaft used to translate crankshaft motion to camshaft motion though the IMS term is often used as shorthand for the bearing in the forums). If the bearing gets loose, it can cause the chain to jump a tooth and the timing to be out. One of the ways of telling if the IMS is worn and wiggling is to compare the camshafts timing.
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Threaded Mode
