Rattle when moving on cold startup

[zillah]

My 2016 GT PP has a weird rattle while the car is moving on a cold startup. If the car stands in place and I rev the engine, there is no rattle. Only when the car is moving, even in neutral. This disappears when the car is warmed up. Any idea as to what that issue might be? Perhaps someone had a similar issue and had it fixed. I did a quick inspection of my wheels, brakes and suspension and everything looked ok. I hear it on the driver side and can only hear it with the driver window down.

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[bigriver]

Since no one has responded I'll chime in. Sounds like you have normal piston slap. There is a predetermined amount of clearance in between the cylinder bore and piston. The metal expands as the engine warms up which is why slap goes away.