The above fix for sure resolved the problem and it never came back. Why did it happen a couple times?....I don’t know.I’m sorry to revive an old thread but did the check valve really solve the rattling noise guys were experiencing? I’ve experienced what sounds like the exact same noise in my 2017 F150 3.5 EB truck. I have had it looked at by Ford but they weren’t able to diagnose what was causing the noise since it was intermittent and only happens once and a while then goes away, and couldn't be replicated.
This truck only has 7,057 miles.
I also found this TSB today:
3.5L EcoBoost - Rattle Type Noise From Engine Compartment Under Various Operating Conditions - 2017 Ford F-150 » FordNHTSA ID Number: 10171858ford.oemdtc.com
And just today my check engine light just came on, was wondering if by chance they could be related.
Scheduled an appt with Ford just want to be prepared when I go in.