Well, there are two modes of rocker arm failure that are known. It either spits it out in which case you will probably have a CEL for engine missfire along with other possible issues. Or the axle can slide out. I have never seen the axle issue and don't know what the exact symptoms are. I can't imagine the rocker staying in place for long if that is the case. Doesn't sound like rod knock.
Is this an MT or AT car? Have you stuck a stethoscope to the bell housing?
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"Experience is the hardest kind of teacher. It gives you the test first and the lesson afterward." -Oscar Wilde.
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