I have spent time searching and reading on this. I am posting this new thread as I guess I am not really getting anywhere and have basically stopped driving the EX until I can figure this out. I have done 2 rounds of Seafoam through the intake, my neighbors are questioning. I am sure it helped something, but not this noise. The sound is not present at startup. It is present after things warm up, the warmer the louder. In order to hear it, I have to drop it into D and rev, while braking. IT DOES cycle with the motor, but does not sound like a rod, not 'heavy' enough. At idle it is about 4 times a second and picks up as I rev up a little while in gear, although I think I can detect it while driving, usually slow on my street where it is quiet. In any event, it is not real loud or real noticeable while driving, but it is very distinct, not the noise of a lifter IMHO, but who knows? I am told (here) that it also may be in the tranny, perhaps the torque converter? Again, I know and have read plenty of posts on this, and I guess I am thinking 'lifter not pumping up' but I want to eliminate rod knock and be assured that a flat lifter will not hurt me while driving as long as I take it easy? Ideas?? Thanks in advance and I also looked on you toob to see if I could find a video of my sound, and I could not. Anybody know of one?