secondary air pump. runs when the car just starts and is cold. It's an emissions thing. You moved the camera really close the SAP during the film and the sound got very loud. Sounds like that's where it's coming from.
Originally Posted by BBBoy323i
Sent from BimmerApp mobile app
I have a dream that one day our children will live in a
nation where they will not be judged by the color of
their skin but by the color of their coolant.
Last edited by WDE46; 05-05-2013 at 03:19 PM.