Shake or Vibration Issues

[Silverado 6.2]

Jesse D:

 

Rough Idle in Drive

September 15, 2015

Some 2015 Silverado 1500, Suburban, Tahoe, Sierra 1500, Yukon models, Escalade models; 2014 Silverado 1500 and Sierra 1500 models equipped with 4.3L, 5.3L, or 6.2L engines (RPOs L83, L86, LV1, LV3) may have a rough idle and/or vibration at idle in Drive. This condition may be most noticeable following extended driving, while idling at a stop in Drive. It will not be present in Park, Reverse, or Neutral.

 

 

 

There will not be any DTCs with this condition. Use the CH-51450-A (Pico Oscilloscope) for diagnosis. With the tool’s accelerometer positioned on forward end of the seat track, the condition will show in the lateral/cross-car direction as E1.5 (1.5 engine order) in the range of 2–7 mg.

 

 

 

This rough idle condition may be improved by performing a motor mount adjustment procedure. The mount adjustment procedure addresses the normal idle characteristics of the Gen-5 V6 and V8 engines transmitted through ground-out in the motor mounts due to frame bracket positioning tolerances.

 

 

 

TIP: Perform the following procedure on both left and right engine mounts at the same time so there is no binding/twisting in the mounts.

 

 

 

Begin by removing the front wheels and wheelhouse liners. Loosen the engine mount bolts at three frame attachment points for both the left and right mounts. (Fig. 13) Also loosen the transmission mount to keep from putting it into a bind. Lift the engine so both mounts are off the frame approximately 10-20mm.

 

 

 

Install 3mm-thick spacers between the bottom surface of the mount and frame bracket, on the inboard side of mount. Do not use tapered shims. Use a small amount of adhesive to hold the spacers in place on the frame.

 

 

 

Installing spacers between the mount and frame bracket at the lower inboard location, (Fig. 14, #1) alleviates the ground-out in the mount at the upper outboard area. (Fig. 14, #2)

 

Lower the engine so the spacers are trapped between the mount and the frame and tighten the bolts. Tighten the center/upper bolt first; then the front and rear bolt. Torque the mounts to 50 Nm (37 lb.-ft.).

 

 

 

For additional information, refer to #PIP5211.

Do you have a PI or TSB number for this or where did you find this? Thanks

 

Sorry I just seen that its at the bottom, but where did you find it still?

Edited September 24, 2015 by Silverado 6.2

[abominable z71]

What is strange is that I have never heard of crappy tires causing come and go vibration problems. That tells me the trucks just don't have enough absorption in the body mounts with this new design. My truck still has some vibes that come and go based on tire temperature, never had that in a truck before.

Definitely the hardest part of trying to pin down the source. The vibration come and goes in it's severity but never goes away. I think tire temperature might play a part but sometimes its just as bad when it's hot as when it's cold. I think it might be a phasing issue. Sometimes the tires are in sync and the vibrations are at their worst after a while of driving and making enough turns they get to a point where the vibrations cancel each other and you just don't know where they are in relation to each other until you hit the freeway and see what kind of vibration you get. This would be an extremely difficult thing to test unless you have your own perfectly straight 5 mile stretch of super smooth asphalt to run up and down so you could clock the tires relative to one another and drive strait ahead.

[tnchevy]

I am to damn tight to buy a new set of tires right now but I will probably break down and get a set of AT LT tires within a year or so. When I do I will buy from a place the next town over that has a good road force balancer and they know how to use it from others I have talked to. Maybe the heavier tires will do a little bit better than the stock Goodyears.

[Jesse Davidson]

 

Jesse, mine does the exact same thing. Sometimes it will idle somewhat smooth and then have a jolt and stumble etc. Drive me nuts being able to feel it at a stop light and if you open the hood like you did and put your hand on it, you can feel it even more ande actually see it happen like you're hitting the gas and the torque is twisting the motor.

 

One thing I did notice is that with the correct oil level mine seemed to idle much smoother. The last 2 times I have gotten oil changes (free) at the dealer they have overfilled it. Once I drained some out back to full, it seemed to do quite a bit better. Not gone but better.

 

Also wondering if the motor mounts are completely tight. I have found multiple bolts on my truck that are way looser than they should be. Ex: real axle u-bolts, should be at 78 ft-lbs from the factory and mine were no more than 40.

 

 

Just thought I'd throw out an update on this. I just dropped my truck off, and brought this and a few other things up to my service writer:

 

-- the torque on the u bolts is actually now a recall, they have found on many vehicles that they are not tight enough. (released in the last few days)

-- there is a recall for some of the 4x4's, which at cooler temperatures, 4x4 kicks in automatically regardless of whether or not you keep it in 2wd (again released in the last few days) I put my truck in 4x4 leaving a job site today, and there was a squealing/ grinding type of noise. this is an indication you have this problem

-- there are a few other recalls, but he didn't get into them because my truck didn't qualify

 

I showed them some of my video's for the vibration and rough idle, so they now know how bad it is, and can't say that it wasn't replicated. We shall see what comes of this attempt, I highly doubt any of the issues I actually brought it in for will be fixed, but who knows.

 

ohh and they gave me a little Piece of Shit Impala LS as my loaner, I complained, but they said thats all they had.

 

 

 

What recall? AFAIK, there are no active recalls??

 

Do you mean TSB's or some other internal document?

 

Did they actually measure runout of the prop shaft, u-joints and check ring and pinion backlash?

The rear axle U bolts not being fully torqued is now a recall on some trucks, I believe the ones assembles in Mexico as mine was.

In addition there is a recall for the front wheel drive portion of the 4x4 trucks, in cold weather the 4WD kicks in automatically, on top of that, there is an issue with some where in 4x4 there is a squealing/ grinding sound, not sure what causes it, but its a part of that recall.

 

This info is coming from my dealer who already did the work on my truck.

 

Definitely the hardest part of trying to pin down the source. The vibration come and goes in it's severity but never goes away. I think tire temperature might play a part but sometimes its just as bad when it's hot as when it's cold. I think it might be a phasing issue. Sometimes the tires are in sync and the vibrations are at their worst after a while of driving and making enough turns they get to a point where the vibrations cancel each other and you just don't know where they are in relation to each other until you hit the freeway and see what kind of vibration you get. This would be an extremely difficult thing to test unless you have your own perfectly straight 5 mile stretch of super smooth asphalt to run up and down so you could clock the tires relative to one another and drive strait ahead.

I agree, I feel like the warmer the tires get, the worse the vibration

[Jesse Davidson]

---UPDATE---

So I went to my dealer today to pick up my truck, instead we took out one of their loaner trucks and took that for a drive. it seemed substantially better than my truck, so they decided to have me keep it through tomorrow to see if I still think that after doing a fair amount of driving. I'll be picking up my truck after work and about 60 miles worth of driving, assuming I don't have to make a run to the supply house which is another 90 miles haha... I really do think that this loaner truck is a lot better than my truck, but there is still a little bit of a vibe, which is still unacceptable under any circumstances.

 

I guess I will see how my truck actually is tomorrow

[4x4LJB]

Do ALL the 2015 Sierra 1500s have this problem?

 

If not, what percentage has it?

[Britt Lifsey]

Do ALL the 2015 Sierra 1500s have this problem?

 

If not, what percentage has it?

Must not be all...

 

http://www.gm-trucks.com/forums/topic/175832-how-many-trucks-dont-vibrate/

 

Percentage? Doubt anyone, at least here, will know. You will hear about how long this thread is but the folks with the problem have posted pretty prolifically here. Plus, it is only a small sample of all of the 1500s sold.

Edited September 25, 2015 by blifsey

[abominable z71]

Do ALL the 2015 Sierra 1500s have this problem?

 

If not, what percentage has it?

This is a number that I don't think you can get with any accuracy. Some people may have it and not notice it, some it is very mild, some trucks might never see the speeds where the vibration occurs so they might have it but you'd never know. For me and others it starts right at 70 mph and up on smooth asphalt. Where I'm at the speed limit on the freeway is 70 mph and has just been repaved recently so I get to experience it everyday on the way to work and everyday on my way home. Do yourself a favor and get a RAM, If I could go back in time and do it over again I would get the RAM. My vibration problem didn't show up until about 2000 miles. So don't think just because the test drive went well that you're in the clear.

[abominable z71]

Do ALL the 2015 Sierra 1500s have this problem?

 

If not, what percentage has it?

This is a number that I don't think you can get with any accuracy. Some people may have it and not notice it, some it is very mild, some trucks might never see the speeds where the vibration occurs so they might have it but you'd never know. For me and others it starts right at 70 mph and up on smooth asphalt. Where I'm at the speed limit on the freeway is 70 mph and has just been repaved recently so I get to experience it everyday on the way to work and everyday on my way home. Do yourself a favor and get a RAM, If I could go back in time and do it over again I would get the RAM. My vibration problem didn't show up until about 2000 miles. So don't think just because the test drive went well that you're in the clear.

[mikegmi2]

Do ALL the 2015 Sierra 1500s have this problem?

 

If not, what percentage has it?

Based on my findings around 80% have some sort of noticeable vibration problem...most commonly the highway shake vibration.

 

I am not kidding when I say I test drove 12-13 Sierra and Silverado trucks, 2014-2015 (mostly 2015) and 10 of them vibrated.

 

Double cabs were by far the worst. Crew were also bad but better than double cabs...and the crew cabs had wide ranges of vibe intensities (the one I settled on I did not notice any vibes when I test drove the vehicle, but it eventually developed a vibe).

[BO TIE 1]

Hey guys been following this thread for a while. I've got a 2014 Silverado dbl cab lt z71 with the 70+ shakes. I recently picked up some wheels and tires on the internet went from the 18's to 20's well that was a mistake cause the shakes got worse. So I take it to the dealer for wheel alignment and road force the tires on my dime. Service writer asks me if I was having any problems and I. Explained the tire purchase and that I had vibrations and a slight pull to the left at highway speeds. So the tech does the job and then tells the service writer that the shakes are caused by my after market exhaust! Really......ugh! So long story longer. I was checking things in the front end and saw the

upper control arm bushings are all cracked. This can't be normal with only 13000 miles. I know if I take it back they'll say it was caused by my level kit. Any thoughts?

[Britt Lifsey]

Based on my findings around 80% have some sort of noticeable vibration problem...most commonly the highway shake vibration.

 

I am not kidding when I say I test drove 12-13 Sierra and Silverado trucks, 2014-2015 (mostly 2015) and 10 of them vibrated.

 

Double cabs were by far the worst. Crew were also bad but better than double cabs...and the crew cabs had wide ranges of vibe intensities (the one I settled on I did not notice any vibes when I test drove the vehicle, but it eventually developed a vibe).

 

Well, I test drove 1. It drove/rode just fine so I bought it. Had never heard of this issue before purchase. So, based on my findings, 100% do NOT vibrate...

[LongrangeLauber]

^^ that makes no sense. There are guys here with legitimate vibe issues. How would that be 100%?

[Britt Lifsey]

Same logic Mikegmi2 used..."based on my findings"

 

Surely you don't agree with his 80% do have vibration issues???

Edited September 25, 2015 by blifsey

[olddutchfarm]

Same logic Mikegmi2 used..."based on my findings"

 

Surely you don't agree with his 80% do have vibration issues???

I think he was just providing his honest experience based on a good number of test drives.

Edited September 25, 2015 by olddutchfarm