Vibration

[Mikef]

I have a 2015i Yukon XL Denali. It now has about 5k miles. When I go above 25mph and let of the gas to maintain my speed or slightly slow I get a weird vibration. Passenger can feel it too. It seems to be worse at 40 to 50 mph. Anyone else have this? Any thoughts?

 

[Mikef]

Forgot to mention that it's 4wd.

 

[Lyon]

Are you running premium fuel?

 

[OR VietVet]

If this has AFM is that what is kicking in? The higher speeds is when I have heard about this but the lower speed vibes confuses me. Have you had any tune work or mods done?

 

[Mikef]

Yes. 91 Octane only.

Nope. No mods. All stock.

 

[Lyon]

Is the engine running 4 or 8 cylinders when you feel the vibrations?

 

[OR VietVet]

Yea, that would be the AFM process.

 

[Rush]

I want to disable the AFM so badly! Hate it...

 

[Mikef]

Is the engine running 4 or 8 cylinders when you feel the vibrations?

Good question. I will watch the next few days. But I think it both but not sure.

 

[Cmicasa the Great XvX]

I tuned the AFM out with my Intune.. and made a lot more improvements over stock as well, particularly the E-Throttle