DavidKR

I was gonna say this as well, port injectors can tick as well (Honda K series engines are notorious for it, my CR-V and Civic Si both did it) so with 12 injectors inder the hood of the new 3.5L there are quite a few things in there that could be making noise.

rustech

Didn't some of the 2015's have an issue where the oil filter anti-drainback or similar was missing?

Matheau Luers

Tried to take a video this morning but the truck only sat for about 3 hours last night. I'm pretty sure that it's not the GDI - it sounds just like my 92 240sx did when the tensioner started to go bad. The sound typically lasts about 3-5 seconds until (I assume) some oil pressure builds and the tensioner takes up the slack in the chain. After that it sounds great.

big_ole_truck

Mine is '16 F150 so it's the prior generation 3.5L.

I switched oil from semi-synthetic to full synthetic and there's no more loud ticking noise at start up. Engine wasn't idling rough but it's very quiet now at idle and it has a better, no loud ticking start up.

Maybe switching to a full synthetic oil is all you need.

TexasRedfish

I bet its the cam phasers .

Manbearpig

Was this ever solved? My 2017 Raptor makes the same noise for 3-5 seconds at start-up.

allicedout

Just picked up my 2017 3.5EB this week, notice that first start up after its been sitting for 6-8 hours is a little rough...... then settles a little, then after about 30 seconds goes perfectly smooth. I'm assuming its just normal start up? I'll grab a video tomorrow and post it up, rather be safe then sorry.

NASSTY

Probably waste gate rattle.

allicedout

Sounds about right^^^

Thanks!

RockyMountain

I also have a startup rattle every time no matter what the conditions are. Do you think this is just waste gate rattle? Video linked.
https://drive.google.com/open?id=1lU...9PnwQlP7rex57E