I seriously doubt you are hearing the injector making noise. But, if you feel that you need to verify the rule-out, then remove an injector and test it with jumper wires. Remember, an injector moves two ways...open and close. I think (based on your recent work) that you are hearing something in the valve train or rotating assembly. Can you take video of this noise and post it, say...youtube?
Last edited by donkeypunch; 05-16-2011 at 01:23 PM.