Silverado Vibration Question

[Leadslinger]

First off, I'm totally new to this site and I'm sure this isn't supposed to be posted in the section. I am experiencing a rough drive and vibration in my 2015 Silverado crew. I began surfing the web in which I found this site. I have taken it to the dealer to fix the issue and recently had a picoscope analysis. Does anyone mind sharing what normal readings should be? Or can anyone share what their readings that resulted in a buy back? Thanks

[scott19677]

http://www.gm-trucks.com/forums/topic/153186-shake-or-vibration-issues/

 

 

Boy do you have some reading to do. Sorry.

[Leadslinger]

Thanks!

http://www.gm-trucks.com/forums/topic/153186-shake-or-vibration-issues/

 

 

Boy do you have some reading to do. Sorry.

[GMCSierra4x4]

Leadslinger, on 16 Mar 2016 - 5:41 PM, said:

First off, I'm totally new to this site and I'm sure this isn't supposed to be posted in the section. I am experiencing a rough drive and vibration in my 2015 Silverado crew. I began surfing the web in which I found this site. I have taken it to the dealer to fix the issue and recently had a picoscope analysis. Does anyone mind sharing what normal readings should be? Or can anyone share what their readings that resulted in a buy back? Thanks

A big vibration thread in this section. But, you mentioned your picoscope analysis. What did the dealer say about the results?

 

There are two different types of picoscope analysis for theses trucks that I am aware of at this time. The first relates to measurements on the motor mounts for the "rough idle" in drive when stopped complaint. The second one is related to vibration between 35-45 mph and 60-70 mph and a little more detailed. The GM diagnostic guide for the second case is flawed from the beginning because the frequency ranges given to confirm the problem due not match the fundamental frequencies of our truck (at least for 20" tires).

[Leadslinger]

Thanks Guys, I've been reading the vibration tread. GMCSiera4x4, the picoscope was for driving vibration. It's vibrates at all speeds but it peaks at 75mph. The picoscope used to test at 40-55mph, imagine that.