Air escaping through a very nearly closed valve. I'm about to start investigating if the N249 can be used to get rid of this.
that's a leak. but possibly an induced "leak" via N249.
Does the DV have a weak spring in it from use/being old?
has the DV been pressure tested?
Why mess with the software before it's even been checked that a part may be failing?
In short, the N249 controls the DV but this isn't normal operation for the DV right? They aren't supposed to honk.
maybe his N249(and other peoples, the Porches, etc) isn't operating properly?, vacuum leak?, boost leak?
In these cases, is the N249 even fitted still?
Is it possible to log the N249 duty cycle to see if it has anything to do with the duck mating calls?