Hi CKTSI
I am not sure is it rattling noise ... it is difficult to describe noise (especially for me it is my third language)
In my case it sounds like ta…ta…ta like tractor, or 2 stroke engine – just for a few seconds when you accelerate just slightly faster from standing (or constant slow driving) position.
It happened 7 - 8 times in 6 months.
Ones...
I stopped (it was just a few degree up hill) and when I accelerated (slightly faster ... not more than 4000 rpm) the noise was so laud and disturbing that I stopped after few hundred meters to see is my exhaust system still there.
In that few seconds it sounded like I was dragging my exhaust sys. or some metal pot on cobblestone.
Otherwise it is not so laud only disturbing and embarrassing
Same thing I couldn't reproduce it when I was visiting dealer
DO YOU (OR ANYBODY ELSE) HAVE NAY MORE INFORMATION