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I am 99.9% sure that your problem is the timing chain tensioner. The dealership is likely playing dumb because it is a pain in the ass to fix. It can be done without removing the engine but I feel that this is the only way to make sure that it is done right.
The 3.3L engines do it all the time. It isn't hurting anything. Just sounds ticky.
The 3.3L engines do it all the time. It isn't hurting anything. Just sounds ticky.