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I think you are going to need to look into it before you do some damage.
A "cheap and dirty" way of figuring out what cylinder is the issue is to allow it to idle, and then disconnect and reconnect the injector at each cylinder, and see if the noise comes and goes. This will allow you to narrow it down to which cylinder.
I think that maybe you have a broken valve spring- and will have to pull the valve cover to take a look, press down on each cam follower to see if any of them can be depressed easily.
ok, let me know what you find!
No, the engine should all be the same, the differences are all in the transaxle, little more work removing it.