Whether this is a new (or just now noticed) symptom of a known problem, or a symptom of a possible issue unrelated to existing problems, I'm not sure. So, for those who may not be up-to date, you may want to read the latest thread regarding my transmission issues here, before trying to diagnose this:

Murphys Back! (http://www.markviii.org/htdocs/dc/dcboard.php?az=show_topic&forum=21&topic_id=65823&mesg_id=65823&page=)

I've just started to notice a buzz in my engine that I can't remember having been there before. I don't hear it during idle, but if I put a little gas into it, it sounds kind of the same as if some kid had a baseball card up against the spokes of their bicycle wheel.

The speed of the buzz is directly related to engine RPM. I can only really hear it while in Park, and it's almost un-noticeable unless I'm close to a sound-reflective surface (i.e.: Parked close to another car, or a wall.) Up to 2,000 RPM under light engine acceleration (I'll check further when I get home) it doesn't seem to go away. In Neutral or Drive, I can just barely hear it when I first put my foot on the gas, but it goes away almost the instant I notice it. It also doesn't seem to differ whether I'm cold-starting the engine or in traffic.

Anyone have any ideas on this? Could it be related to any of my other issues, or am I just being a hypochondriac now?:confused:

I would say it might be pinging or detonation.

Leaky EGR tube. My father's '95 makes that same buzzing.