2009 S550, 1973 Avanti II, 2008 Silverado LTZ
Sorry to bring this up again, but I have been trying to diagnose this noise for the last couple weeks and I keep coming back to the pulsation damper because the more I read about it, the more it seems to fit! Here's a short video I just shot, and hopefully you can hear it well enough. Very obvious in the car between about 1000 and 2500 RPMS once the car is warmed up. My mechanic friend thinks it's the motor mounts, but I just really don't think so; they were replaced last year at the dealership according to the extensive records I have on this car. It's an S550 with ABC, so excuse me for posting here, but you guys have the most experience with this system.