Interesting thread.... and issue.
Have you considered maybe getting a mechanic's stethoscope and probing around in an attempt to "pinpoint" that noise? Just tossing it out there....
There's gotta be a logical explanation...….

 

Never had luck with a stethoscope on a 12 valve .

 

Indeed. Mine doesn't sound like that on a cold start, but that could be because you didn't exactly give it any help in that video. Dunno if you did it that way to reinforce a point or if that's how you always cold start it, but either way- years back we were talking about the sound of exhaust from different brand diesels and someone commented that to them a Cummins sounds like a moose farting in the wind. It wasn't until this topic that I had any idea WTF he meant by it. Regardless, I wonder if it would still do that if you start it according to the owner's manual. As for the TC, I believe his issue doesn't go away with warm up, and only lessens as RPM rise but doesn't go away. So it's possible that his idle is set too low, but it sounds like that is only exacerbating the situation not causing it. .

 

Good point!! Doh!!!!

 

I honestly think its your idle, get a Tach kit for a 12 valve, they arent expensive.

 

 

 

 

I doubt it too, but they're cheap.

 

On a side note, what is your username supposed to represent? I've been scratching my head for weeks trying to figure it out.