Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
I think that's probably the longer duration rattle; the one that goes for about 20-30 seconds after startup. I've had 3 different dealers tell me that longer rattle is an exhaust issue that is normal and always goes away after 20-30 seconds. It is much softer than the very harsh 2-3 second rattle that needs service.So, my friend just got his f150 back and the noise he has now that he thought was the cam phaser again they say is an exhaust rattle and that it is pretty common. I haven't heard it so I can't make any comments on that. So, it sounds like there is a good chance a similar sound rattle at cold startup is exhaust noise. Not sure if it is a loose heat shield or what it is.
I think that's probably the longer duration rattle; the one that goes for about 20-30 seconds after startup. I've had 3 different dealers tell me that longer rattle is an exhaust issue that is normal and always goes away after 20-30 seconds. It is much softer than the very harsh 2-3 second rattle that needs service.
Finally. Here is a video explaining the root cause of the rattle. A plastic pin!