[bsb2001ca]

So when sitting at a red light, my ign timing usually says between 4 and 8, but then it will drop to -4 and sometimes even to -10. It rocks the car back and fourth at -4 and even more so at -10.
I'm in a 2015 auto, 41,000 Km's.

 

[bsb2001ca]

Turns out I was slowly loosing the check valve in the intake. It was replaced under warranty and hasn’t done it since.