5.0 Explorer cold start rattle. Video inside

93 saturn sl2

Forum Member
My explorer has this rattle, kinda sounds like marbles or something rattling around. It only happens when the truck has been sitting overnight or a few hours (in the extreme cold). Once the engine warms up, it goes away. Any ideas of what it could be? The engine is a 5.0, 144k miles. Runs great besides this noise.

The video might not be the best but you can hear it.

 
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