Rattle/humming/vibrating

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MaxinRelaxin

Member
Joined
Feb 11, 2021
Posts
12
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1
Location
California
Hello everyone, please help me diagnose this problem with my 2012 4x4 Expedition

when I accelerate from when I take my foot off the peddle in 1st gear I guess, there is a rattle vibrating humm.

I’m guessing something to do with the Pulleys and Serpantine belt?
 
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