Highway speed vibration on 2020?

flyingfool · September 29, 2020

yeah i'm not confident the GM techs can use a picoscope., but would love to see someone find the vibes while driving on the road surface vs a dyno surface

dwchapmanjr · September 29, 2020

2 minutes ago, flyingfool said:

yeah i'm not confident the GM techs can use a picoscope.

Watch a few videos, its really simple. Have them do the picoscope and verify the issue was reproduced during it. By default it only takes a 50 second capture. Then have them give you the file. You can download the software and open up the file for free.

dwchapmanjr · September 30, 2020

So a lot of people don't have access to PicoScopes or they don't understand the science behind what it does and how it does it to ask the right questions of the dealer. I wrote this article documenting what I learned going down that path on mine. There are some economical options ranging from a $399 app to a $10 app if you want to do a lot of the manual calculations.

I wanted to share incase it helps anyone and their vibration issues. I'm still working through mine now. My regular service advisor at the dealer came back from vacation and followed up with me on an unrelated issue. I asked him if they could do a PicoScope for this issue and he said they could. I'll likely ask for the file so I can view it as the pico diagnostic software is free (in view mode) regardless of their findings.

With all of that said, here's my blog of it. I hope it helps someone understand the steps and possibly even diagnosing their own.

https://blog.woohoosvcs.com/2020/09/quick-and-dirty-noise-vibration-harshness-quantification/