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AUX_man · 11-22-2016, 06:45 PM

I took my 2015 Z51 (A8) in for the airbag recall and oil change this past week. On the way home at about 65 mph in cruise control I noticed a “shudder” or "rumble". I use cruise control a lot and I never experienced that before (11k miles). It almost is like hitting a rough spot in the road or going over a rumble strip on the edge of the highway, only more subtle. The speed control doesn't hold the speed constant and I noticed that the RPMs were undulating in sync with the "shudder" and speed. The RPMs increase by 1 or 2 hundred and then fall back. It's during the decrease in RPM that the "shudder" occurs. It is true that there is a slight roughness when going from 4 to 8 cylinders but that is only momentaryand when RPMs are going up.
Time to go back to the dealer I guess. ?? I can't be the only one with the problem.

11-22-2016, 06:45 PM	#1
AUX_man Drives: 2015 Z51 '86 IROC Join Date: Sep 2014 Location: Quinby, VA Posts: 24	Cruise Control "shudder" & not constant I took my 2015 Z51 (A8) in for the airbag recall and oil change this past week. On the way home at about 65 mph in cruise control I noticed a “shudder” or "rumble". I use cruise control a lot and I never experienced that before (11k miles). It almost is like hitting a rough spot in the road or going over a rumble strip on the edge of the highway, only more subtle. The speed control doesn't hold the speed constant and I noticed that the RPMs were undulating in sync with the "shudder" and speed. The RPMs increase by 1 or 2 hundred and then fall back. It's during the decrease in RPM that the "shudder" occurs. It is true that there is a slight roughness when going from 4 to 8 cylinders but that is only momentaryand when RPMs are going up. Time to go back to the dealer I guess. ?? I can't be the only one with the problem.