Jump to content

Shake or Vibration Issues

Silver space ship
 Share

Recommended Posts

pm26 Senior Enthusiast

pm26

Posted
Posted (edited)

 

So how would the PICO scopes analyze this vibration? Would it be in the same harmonics as a tire / wheel?

If the vibration is caused by in an improper pinion shaft to driveshaft angle, the vibration will occur at the actual engine speed in any transmission gear. If the vibrations are caused by wheels, hubs, brake rotors, and/or axles, they typically occur at approximately 1/3 of engine speed (depending on your rear axle ratio). If the vibration frequency remains the same, it is typically a driveline problem, if the vibration frequency changes, the source is typically the engine or transmission.

 

I am not familiar with GM's vibration analyzing methodology, but any GM engineer trained in vibration analysis should be capable of pinpointing the source of vibration with their equipment. The real question remains - are they really trying to find the cause and fix it or merely putting on a show? The main concern will of course be their acceptance/rejection criteria - do we know if these have been adjusted by GM to cover most of the troublesome trucks so they can claim that the trucks perform "within their design parameters." ? These are all questions that remain open at this time.

Edited by pm26
  • Replies 12.9k
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

csckickass
csckickass

Well folks, I did it. After all the failed attempts at the Chevy dealer I traded it in for a 2015 Ram 1500 Larame. I have to agree with the other folks on here that have done the same thing, it was th

mafd2
mafd2

Apparently you and the other customer reps don't care. If you or GM would care y'all would put more effort in the matter. Just coming on the forum and stating the same repetitive posts and being a 3

DALaws
DALaws

Well I have some good news and bad news about my truck vibrations. Good news is that my truck has a significantly less vibration at speed. The bad news is my truck has significantly less vibration. Fo

Posted Images

yahtzee Enthusiast

yahtzee

Posted
Posted

A while ago I started chasing down editors/writers at top auto rags and publications to try and get some traction on these issues. I also created a Facebook group as an alternative source for information.

 

It finally looks like at least one automobile publication is going to be writing a story about these issues. I just got word that the news editor for a auto rag (can't say just yet) is "finalizing his story on the SUV issues" and asked for more information. I hope this is the bump we need to get GM to get off of their ass and do something. I will keep you all posted. FYI, I have a 2016 Yukon XL Denali with buffeting issues but also with the terrible vibration issues that you guys are experiencing as well.

  • Like 2
14silverado4.3 Enthusiast

14silverado4.3

Posted
Posted

A while ago I started chasing down editors/writers at top auto rags and publications to try and get some traction on these issues. I also created a Facebook group as an alternative source for information.

 

It finally looks like at least one automobile publication is going to be writing a story about these issues. I just got word that the news editor for a auto rag (can't say just yet) is "finalizing his story on the SUV issues" and asked for more information. I hope this is the bump we need to get GM to get off of their ass and do something. I will keep you all posted. FYI, I have a 2016 Yukon XL Denali with buffeting issues but also with the terrible vibration issues that you guys are experiencing as well.

Thanks following FB also.... Are they doing vibration and buffeting for both the SUV and the Trucks?

rshad Enthusiast

rshad

Posted
Posted

A while ago I started chasing down editors/writers at top auto rags and publications to try and get some traction on these issues. I also created a Facebook group as an alternative source for information.

 

It finally looks like at least one automobile publication is going to be writing a story about these issues. I just got word that the news editor for a auto rag (can't say just yet) is "finalizing his story on the SUV issues" and asked for more information. I hope this is the bump we need to get GM to get off of their ass and do something. I will keep you all posted. FYI, I have a 2016 Yukon XL Denali with buffeting issues but also with the terrible vibration issues that you guys are experiencing as well.

What is your Facebook page on these problems?

Luke Fontenot Enthusiast

Luke Fontenot

Posted
Posted (edited)

If the vibration is caused by in an improper pinion shaft to driveshaft angle, the vibration will occur at the actual engine speed in any transmission gear. If the vibrations are caused by wheels, hubs, brake rotors, and/or axles, they typically occur at approximately 1/3 of engine speed (depending on your rear axle ratio). If the vibration frequency remains the same, it is typically a driveline problem, if the vibration frequency changes, the source is typically the engine or transmission.

 

I am not familiar with GM's vibration analyzing methodology, but any GM engineer trained in vibration analysis should be capable of pinpointing the source of vibration with their equipment. The real question remains - are they really trying to find the cause and fix it or merely putting on a show? The main concern will of course be their acceptance/rejection criteria - do we know if these have been adjusted by GM to cover most of the troublesome trucks so they can claim that the trucks perform "within their design parameters." ? These are all questions that remain open at this time.

 

pinion shaft to driveshaft angle issues will change with vehicle speed/tire speed not engine speed. the drive shaft is always spinning approximately 3 times the speed of the tires.

 

depending what gear the transmission is in will determine the engine speed for a given vehicle speed.

 

you can do 70mph in 5th or 6th. the engine speed will be very different. however the tire rpms and drive shaft rpms will be the same at 70mph in 5th as they are at 70mph in 6th.

Edited by Laf7337
LongrangeLauber Senior Enthusiast

LongrangeLauber

Posted
Posted

has there been any 16's vibrating yet? dealer is taking mine back and ordered a 16 for me. will get it next month.

As far as we know, no. But, we're pretty sure, not 100%, that nothing has really changed besides the front fascia

 

 

Sent from my iPhone using Tapatalk

C6Bill Enthusiast

C6Bill

Posted
Posted

Read back a few pages, I test drove a 2016. That's why I'm driving a Tundra now.

 

And I had a 2016 on order to replace my 2014 too, but GM never picked up the order. Just guessing here but I am sure they knew why it was ordered and that is why it was never picked up.

 

 

And I know I said I was out but I just got a PM from another member of "the club" and I had to come back in to congratulate him on his new RAM.

 

Besides, this is like a train wreck, i just can't stop watching :(

  • Like 1
Smithr66 Enthusiast

Smithr66

Posted
Posted

The update I have on my truck today is not a good one. The dealer called and said the vibration is "better". They loosened all motor, tranny, exhaust mounts and torqued them all back down. Then the genius field engineer decided to balance my new driveshaft with hose clamps. Is this really the best thing their engineers can come up with?

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • dna9656
      New to Me 2010 SLE (Quirks, Issues)

      By dna9656 · Posted

      Your tire pressure issue may just be batteries, you can reset them using tge Ing switch (I think) and the owner's  manual. ChatGTP will b e a faster, better help than Google.
    • Another JR
      Towing In Loose Gravel

      By Another JR · Posted

      The thinking is that starting out in a higher gear makes it easier to avoid applying excessive torque when pressing the gas pedal. In a modern 4wd truck with 4 low and a limited slip or locking rear end, I would use 4 low and try to crawl up the ramp. Sometimes if they are too slippery, you have to back up to let the boat have some bouyancy, and then accelerate briskly to get some momentum to help you pull the through the slippery parts. 
    • XY74
      Roll up bed cover experiences

      By XY74 · Posted

      I have a Retrax pro that I first had on my 2020 chevy and transferred it to my current GMC.  It stays in the garage most of the time, so hard for me to judge it's long term weather resistance.  It still works perfectly, been very durable.  It doesn't see oil patch usage, but it's not a mall queen.  It keeps most things mostly dry (small leaks) and the security of it is enough to slow someone down but not keep them out for long.  I would buy one again, it works for me.     
    • fm2176
      New to Me 2010 SLE (Quirks, Issues)

      By fm2176 · Posted

      Thanks to the convenience of Amazon, I was able to get a few things done to the truck today.  I installed Carquest Premium oil and air filters with five quarts of Mobil1 High Mileage 10-30 along with a quart of Pennzoil Platinum 5w-30 I already had.  The latch for the flip up center console lid was broken so I replaced it along with the power mirror switch.  I found my push retainer assortment this morning and reattached the plastic under the bumper and it was only held on with a few screws and retainers.  Then I programmed a new remote keyless entry fob so I can lock my dog in the truck when I take her out with me (I've got to keep the air going for her since it's been in the 100s).  Finally, I ordered some LED interior bulbs and replaced the reading lamps.  The front lights are working fine while one of the back lights only works intermittently and the other not at all.   While under the truck, I found the source of at least one of the noises: the sway bar links need replacing.  I ordered a set of Suspension Dudes links with Code Red bushings.  Never heard of them, but they're made in the USA and have decent reviews.  While making yet another Amazon order, I went ahead and added a set of front tow hooks.  I went with red, since that's the color of the sway bar link and bushings and it should look decent enough on a black and chrome truck.  Speaking of which, it doesn't bug me much, but the passenger side mirror has a chrome cap while the driver side doesn't, so eventually I'll make them match one way or another.  Oh, and I ordered a $20 TPMS reset tool.  No idea if it will do anything for my sensors but it was cheap and will work for the Ford Transit Connect as well.     For tradition's sake, I ordered a new oil change wrench.  I kept the Snap-On 9/16"x15mm GM wrench I bought when I was 18 in the 2006 GMC from the time I bought that truck until the truck was lost.  While I was tempted, there's no need to spend $80 for a new SO wrench, or even $50 with shipping for a used one on Ebay.  I just bought a Duratech 15mm extra-long ratcheting wrench to do the job as needed.  It works, and if I like that wrench enough, I'll buy the set.  
    • Another JR
      Multigate electrical problem

      By Another JR · Posted

      The recall is for exactly this issue - those drain holes combined with the limited environmental capability of the tailgate electronics card inside the tailgate were a problem. The “safety issue” was the potential for the tailgate to spontaneously open, but all kinds of tailgate misbehavior can occur from water contamination of that control card.    There is no real fix yet. The initial recall just disabled the tailgate. Later, when parts became available, they would replace bad parts with new parts of the same bad design. My dealer is going nuts because the few times I let them get their hands on my truck, my tailgate is off due to a slide-in camper installation. They really want to cut my tailgate wires, but I won’t give them the chance. I will let them get their dirty hands on it when a real fix (redesign) is available.  My tailgate, which works just fine with sealant plugging the drain holes, will remain safe in a dry storage crate until then.  

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...