I've recently noticed, perhaps because my windows are open in the
Springtime air, that my 2000 323i makes a little honking noise upon
acceleration. The only time it's noticeable when driving is when I
first take off from a stop. honk.
I also noticed a little honk when I stated it, and a little honk when
I shut it down, as the RPM's dropped from idle to zero.
It's running fine, as far as I can tell...