B8 S4 Buzzing noise
Hello all,
TLDR: buzzing noise from Coil pack #4. Pls send help.
I recently inherited a B8 S4 and I'm working through a number of issues. Just finished replacing the alternator, the vacuum pump, and the associated belts and tensioners. I will also be replacing all the control arms and a wheel bearing next week.
I come to you today as after starting it back up with the new alternator I notices this strange buzzing sound that to my ear sounds like its coming from coil pack 4 (front drivers side). Now I did just replace the vacuum pump, but to me it sounds electrical not mechanical or air, and it is distinctly from the area of that coil pack.
So far there are no codes popping up, but I haven't driven it around yet as I was planning to tackle the suspension issues before taking it for a spin.
Anyone seen this before or had a similar issue?
Edit:
I did find this post from 2 yrs ago, but not much of a response. https://www.reddit.com/r/AudiS4/s/9YB0O2UAvW