Shake or Vibration Issues

[Jesse Davidson]

Got my truck back. New tire and balance felt way better. The first thing I did was push it to 70 mph on the tollway. Ride was pretty smooth up to about 68, then the console and passenger seat shook hard right as I reached 70 up to around 82. Then it settled down. Service guy tells me they couldn't have balanced the tires at the other dealership. All 4 were completely out of balance. Sad it has to be this way. Apparently GM is short on good mechanics.

Be aware, I've had mine balanced, they 2 weeks later they were all way out of balance, and the RFB numbers jumped dramatically... like 2 to 35 dramatically

[Severado]

Be aware, I've had mine balanced, they 2 weeks later they were all way out of balance, and the RFB numbers jumped dramatically... like 2 to 35 dramatically

What now? Driveshaft? Transfer case? Change the other 3 tires for new ones?

*Update*

NVM. I went back to about page 400 and found what I was looking for.

Edited June 1, 2016 by severado

[Smickie500]

I get really bad wind buffeting when I roll my back 2 windows down running 75 mph . It will shake the whole truck and is really loud. I think it is still buffeting with the windows up but I just can't hear it. I am wondering if anyone else has experienced that . I have a 2016 Sierra Denali 1500...I also have a bed cover to.

[scooter484]

Hey scooter484,

 

I am glad to hear that your dealership is taking care of you and working with you to resolve your issue. Do not hesitate to reach out to me if you need any additional assistance and I will contact the dealer on your behalf.

 

Kindly,

 

Anthony Z.

GM Customer Care

So Anthony, you should really talk to the dealership, they are brushing me off again on the tire issues and I have to buy a new tire again because they keep going bad. I took it for a second opinion yesterday and the tire was so badly out of round it would have taken 4oz and 6oz to fix it at Discount Tire.. hell you could see the tire hop in the machine.

 

Don Hewlett Chevrolet

(512) 681-3000

 

They say because I scrub the curb with my tires it is causing them to go out-of-round. I say BS on that.

 

 

344

[Jesse Davidson]

What now? Driveshaft? Transfer case? Change the other 3 tires for new ones?

*Update*

NVM. I went back to about page 400 and found what I was looking for.

They replaced all of my tires last time (final repair attempt) last week, vibration was greatly reduced, but still slightly present, I have noticed that the critical frequencies have changed though, the speed that the resonance hits is now lower than it used to be 70-72 instead of 74-76, same with the 43-46mph one, its not 40-44mph.

[14silverado4.3]

 

 

 

I thought this was going to be our savior.... NVH App for smartphones

Until I saw the price....$399.99

[Jamesandrew4]

Can someone help me make sense of this? The service manger does not know how to read it either do I. Pico picture attached. Lemon law lawyer has offered settlement from GM but that is based on them thinking the truck is within spec I was told it failed the pico then they sent this and said it didn't.

[Jesse Davidson]

based upon that, your truck is within GM's made up spec of 22mg. Your largest vibration is a T1, which is something on the truck that rotates at driving speed, ie tires, rims, rotors etc. You will still feel the vibration with a pico scope reading in the teens, mine was 25 reduced to 16, then it went back up, and is currently low. but they didnt give me the reading. I still have a very very slight vibration, enough that I notice it. I would still argue with GM about it saying that any vibration is unacceptable. Be aware. that reading is only a 30s snapshot of the entire drive. they don't give the reading for the entire drive, so we could also possibly argue that we have no way to prove that those readings are truely the worst.

 

hope this helps

[Snoringbear]

I get really bad wind buffeting when I roll my back 2 windows down running 75 mph . It will shake the whole truck and is really loud. I think it is still buffeting with the windows up but I just can't hear it. I am wondering if anyone else has experienced that . I have a 2016 Sierra Denali 1500...I also have a bed cover to.

About your wind buffeting w two windows down @ 75 mph; your truck, as most modern cars and trucks, was designed to drive at speed with the windows up so to optimize fuel mileage and quietness. Repeat this condition with any car or truck and you will see what I mean. However, I too enjoy driving with my window down at times. When so doing, I roll down my drivers window all the way, open vents to outside air, then crack the right rear passenger side window about two or three inches. By doing this buffeting is slight. Give it a try and let me know how it works for you. Btw, I too live in North Texas. God Bless Texas !

[Jesse Davidson]

Someone already posted something similar to this, but I am trying to find industrial standards on vibration to counter what appears to be a made up spec by GM and came across this.

 

https://www.ccohs.ca/oshanswers/phys_agents/vibration/vibration_measure.html

 

this is from the Canadian Center for Occupational Health and Safety and specifically says that you should reduce vibration because of "ill health effects" yes, i printed this to my arbitration

[Snoringbear]

Someone already posted something similar to this, but I am trying to find industrial standards on vibration to counter what appears to be a made up spec by GM and came across this.

 

https://www.ccohs.ca/oshanswers/phys_agents/vibration/vibration_measure.html

 

this is from the Canadian Center for Occupational Health and Safety and specifically says that you should reduce vibration because of "ill health effects" yes, i printed this to my arbitration

Jesse D, wondering what you hope to get out of your arbitration? Is there a formula? Or, will you hope to get a full refund? Just curious.

[Jesse Davidson]

Jesse D, wondering what you hope to get out of your arbitration? Is there a formula? Or, will you hope to get a full refund? Just curious.

All I want is my money back so I can go to a brand that actually builds a truck properly and takes care of their consumers

[Rock1500]

About your wind buffeting w two windows down @ 75 mph; your truck, as most modern cars and trucks, was designed to drive at speed with the windows up so to optimize fuel mileage and quietness. Repeat this condition with any car or truck and you will see what I mean. However, I too enjoy driving with my window down at times. When so doing, I roll down my drivers window all the way, open vents to outside air, then crack the right rear passenger side window about two or three inches. By doing this buffeting is slight. Give it a try and let me know how it works for you. Btw, I too live in North Texas. God Bless Texas !

My car does it and it's so bad it gives me a headache so I can never roll down the back windows. like you said, all cars do it. It comes in handy having the sliding back window to avoid this

 

Sent from my SM-N900V using Tapatalk

[abominable z71]

Can someone help me make sense of this? The service manger does not know how to read it either do I. Pico picture attached. Lemon law lawyer has offered settlement from GM but that is based on them thinking the truck is within spec I was told it failed the pico then they sent this and said it didn't.

Do you have a vibration issue above 70 mph? If so the pico results don't show them testing the truck at that speed. It looks like you have an All Terrain presumably with 275/55R20 tires. If that's the case a T1 vibration at 70 mph should occur at 12.3 Hz T2 at 24.6 Hz and T3 at 36.9 Hz. 9.4 Hz as shown on the paper work occurs at about 53.5 MPH. So of course it's within spec at 70 mph when data was taken at 53 mph. it's like dropping your phone from 4 feet and it not breaking and then claiming it won't break if you drop it from 8 feet. Service manager can't read a PICO???? But it's within spec, what a load!

Edited June 1, 2016 by abominable z71

[Snoringbear]

My car does it and it's so bad it gives me a headache so I can never roll down the back windows. like you said, all cars do it. It comes in handy having the sliding back window to avoid this

Sent from my SM-N900V using Tapatalk

I have the sliding back window as well. I've experimented with varying degrees of it opened/closed along with the same with various combinations with front and rear windows. My best luck has been with the drivers side window all the way down, having the RR passenger side window cracked about two or three inches - along with the front vents set to allow outside air to flow through. But, that's just me. I'm certainly no expert on this for sure