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Loud rattle from engine bay 2021

Jaolered
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Jaolered Enthusiast

Jaolered

Posted
Posted

Hey all, 2021 Silverado 2.7. 70,000 miles. Lately I've started getting a pretty loud rattle from the engine bay, especially when engine is cold. Seems to subside a little once the engine is at full temp. I've attached a Google link to short video. 

 

https://photos.app.goo.gl/j4vRZwr6uFk8AmbX6

 

My first thought was it's a bolt that fell through the engine compartment and landed on the plastic tray (I put a CAI in at one point) but I've dropped the trays and retrieve the one I dropped. No idea.

Booger T Enthusiast

Booger T

Posted
Posted

Don't know what part of the country that you live in but if you have recently driven in snow/ice conditions and the weather remains cold it could be ice buildup underneath vehicle. Have had this happen on my last two trucks. A 2020 1500 and just recently on my 2022 2500 HD.

KARNUT Senior Enthusiast

KARNUT

Posted
Posted

I don’t know how big the engine covers are on new GM trucks but I’ve experience rattling with them when cold. It can sound like knocking. 

Silverado4x4 Senior Enthusiast

Silverado4x4

Posted
Posted

Sounds like a loose heat shield as once the vehicle heats up it expands and tightens itself up some. I had this same type of sound on my fathers-in-laws truck found to be a loose heat shield on the convertor did some adjustments with my hands and noise was gone. 

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