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2014 Sierra knocking sounds while in V4 mode

GMguy27

By GMguy27
in Troubleshooting & Recalls

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GMguy27 New Member

GMguy27

Posted
Posted (edited)

See the attached link

to a YouTube video of the sound. I've read lifters are a common issue with AFM

systems but this sound isn't tinny enough in my opinion, any ideas would be helpful. Nothing under the vehicle is loose, my local mechanic could not find any obvious issues. I'm unable to replicate the sound in V8 mode.  

Edited by GMguy27

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