Re: Vexing problem.
This can be a tough diagnosis request. The first thing I try to do is determine if the noise changes when the cylinder is grounded(no spark). If so, it points me toward the piston/rod area. If no results are obtained from that test I try to determine if the noise is at piston speed or at valve speed intervals. With some rigorous intelligence you will figure this out because the valves(obviously) move at only half that of the piston.
As an aside, if the noise comes and goes don't discount the fuelpump as a contributor.
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