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Originally Posted by Steve Tinker
Is it really "knocking" or do you mean tapping - as in the hydraulic lifters pumping up? Which is not uncommon with a cold engine and dirty or old oil.
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Well it's not high-pitched, so I would call it more of a knocking sound. However, it could be a lower-pitched tapping noise. Not sure what the lifters reallly sound like. It would make sense, though, considering it's only on a cold start.