Shake or Vibration Issues

lylknutsak · October 25, 2017

5 hours ago, Snoringbear said:

How/why would AFM cause excessive oil consumption? Not being argumentative just wanting to learn.

Not really sure why it helps, but I know it works. I'm sure there's a thread on here about it. Fixed my oil burning issues.

Maybe it has something to do with a lack of pressure in the cylinders that are disabled allowing oil to pass through the piston rings?

Read some horror stories of excessive carbon build up in the combustion chamber caused by the AFM.

evlwhtman · October 25, 2017

17 hours ago, lylknutsak said:

Not really sure why it helps, but I know it works. I'm sure there's a thread on here about it. Fixed my oil burning issues.

Maybe it has something to do with a lack of pressure in the cylinders that are disabled allowing oil to pass through the piston rings?

Read some horror stories of excessive carbon build up in the combustion chamber caused by the AFM.

Put a catch can on it. They burn plenty of oil on blow by, the catch can helps with that and keeps the intake cleaner.

lylknutsak · October 25, 2017

37 minutes ago, evlwhtman said:

Put a catch can on it. They burn plenty of oil on blow by, the catch can helps with that and keeps the intake cleaner.

And the direct injection keeps fuel from cleaning the tops of the valves

Snoringbear · October 26, 2017

On October 24, 2017 at 9:05 PM, lylknutsak said:

Not really sure why it helps, but I know it works. I'm sure there's a thread on here about it. Fixed my oil burning issues.

Maybe it has something to do with a lack of pressure in the cylinders that are disabled allowing oil to pass through the piston rings?

Read some horror stories of excessive carbon build up in the combustion chamber caused by the AFM.

Took your advise and found this link. Seems to provide pretty good info. Apparently GM has acknowledged that there can be a problem with some vehicles.

https://parts.olathetoyota.com/blog/4920/gmc-chevy-afm-oil-consumption

just a side note; my driver prior to my current 2015 Silverado 6.2 was a 2008 Silverado 5.3. It had AFM and at 140,000 miles when I traded it in engine was still tight, maybe down a half quart at 5,000 mile oil change time, especially if I had been doing some long distance towing. Btw, my current driver, 2015 Silverdo 6.2 is tight as a drum, zero oil consumption. Just another input from my search; appears the recommended 0 / 20 weight oil having lower viscosity than previous recommended weights can cause oil consumption if engine tolerances aren't tight enough.

EFLine · October 26, 2017

I found the above link too and have not disabled AFM yet, however I burn 1.5 to 2 qrts every 3,000 or so miles, depends how i drive it. And to bring this back to the topic, I too have the shakes, very noticeable around 76-80mph for me, and with speed limit 70 around me, I'm either the slowest (under 74mph) or fastest guy (above 82mph) out there so we dont get sick in the car by vibrating.

Dmf10e · October 26, 2017

5 hours ago, EFLine said:

I found the above link too and have not disabled AFM yet, however I burn 1.5 to 2 qrts every 3,000 or so miles, depends how i drive it. And to bring this back to the topic, I too have the shakes, very noticeable around 76-80mph for me, and with speed limit 70 around me, I'm either the slowest (under 74mph) or fastest guy (above 82mph) out there so we dont get sick in the car by vibrating.

This bad at 76-80?

IMG_0511.MOV

EFLine · October 27, 2017

18 hours ago, Dmf10e said:

This bad at 76-80?

IMG_0511.MOV

So its just a thought and I only say this out of curiosity. So with you having a bench seat in the middle, I wonder if that "shows" more effect of the shake then say mine with the captains chairs in front because my cup holders/arm rests are also not on a pivot and cant rattle to the extreme that yours can? I only say this because I have had about 10 loaner trucks from GM, some shake and i see the effects in the arm rest more so on the bench seats than i do on mine, HOWEVER, it feels the same in the chair in both cars but the effects are not shown as extreme on mine.

if you youtube "Chevy Shake" it appears that most of the videos are of people with the bench seat, just my observation.

Ha, I am no engineer so maybe that has absolutely nothing to do with it.

Dmf10e · October 27, 2017

5 hours ago, EFLine said:

So its just a thought and I only say this out of curiosity. So with you having a bench seat in the middle, I wonder if that "shows" more effect of the shake then say mine with the captains chairs in front because my cup holders/arm rests are also not on a pivot and cant rattle to the extreme that yours can? I only say this because I have had about 10 loaner trucks from GM, some shake and i see the effects in the arm rest more so on the bench seats than i do on mine, HOWEVER, it feels the same in the chair in both cars but the effects are not shown as extreme on mine.

if you youtube "Chevy Shake" it appears that most of the videos are of people with the bench seat, just my observation.

Ha, I am no engineer so maybe that has absolutely nothing to do with it.

Yeah I thought about that. Just seems hit or miss on here. Some people don't have the issues, and/or shake, other have it. When I first bought the truck and maybe up to about 5k miles I didn't notice it. But now its very noticeable. And its not just the center, you can feel the vibration all over. I can hear the zippers on my bag rattle in the backseat too. It's just these $45k trucks shouldn't have these "normal" issues.

Buckem · October 28, 2017

On ‎10‎/‎18‎/‎2017 at 6:31 AM, JK29 said:

Hey Buckem,

Mine has the RPM "flutter" as well every time the truck shudders. It swings about 150-200 RPM each shutter. My truck is 100% stock. It also goes away on deceleration.

Took truck back in for vibration and they listened to me this time. Test drove again and felt vibration. Doing a tranny flush and possibly replacing torque converter per GM recommendation. Also got shim kit installed for drive seat movement, tranny TCM update, airbag/seatbelt recall taken care of and front end alignment.

EFLine · October 30, 2017

On 10/27/2017 at 5:10 PM, Dmf10e said:

Yeah I thought about that. Just seems hit or miss on here. Some people don't have the issues, and/or shake, other have it. When I first bought the truck and maybe up to about 5k miles I didn't notice it. But now its very noticeable. And its not just the center, you can feel the vibration all over. I can hear the zippers on my bag rattle in the backseat too. It's just these $45k trucks shouldn't have these "normal" issues.

Thats what I have too, and it drives me nuts. all the zippers from my gym bag, laptop bag, any tools in the back, sounds like a drunk 2 year old concert. not to mention if i do not have a passenger, the seat belt metal tab constantly rattles against the side pillar. Thought about putting 3m velcro (soft side) there so prohibit any additional rattles.

Dmf10e · October 30, 2017

On 10/17/2017 at 9:43 AM, Patriot78 said:

Sorry should be specified, it's a 6 speed, I have a range afm module so I can try and see if that makes a difference but I'm pretty sure when I was using it before it made no difference

I have a 6 speed and it still happens when I have my afm disabler in. Shifting is a little better too. Its a toss up for me for which i rather have an issue with over the other. haha. I'd like both to be fixed since its a $45k truck. Not normal!!

UWSkier · November 1, 2017

Been following this thread as I've had a shaker of a Denali for over a year. Replaced most of the tires to RFB them which made it better, but then on first tire rotation, problem came back. It spent all last week at the dealership. GM ended up swapping out the Goodyear Eagles that came on it with some Bridgestones and the problem seems better on first drive. Fingers crossed it stays that way, but I gotta wonder if the different tire is a different durometer or something and just masking another problem.

Edited November 1, 2017 by UWSkier

EFLine · November 2, 2017

has anyone replaced their Torque converter themselves? I am out of warranty and thinking of replacing the TC as well as the axles from Yukon and Bilstien 5100 shocks.

If you did replace your TC, what one did you use and did it end up helping? I have lots of other issues with RPM surges that im hoping this could eliminate a few issues

Edited November 2, 2017 by EFLine