Flutter noise?

[Steebo]

My 2018 Raptor is making a flutter noise (sounds like 2 pieces of metal tapping fast) when I fully let off on the accelerator on cold starts. Noise goes away when everything comes up to temp. No warning lights but I havent checked to see if any codes were thrown, I'll do that when I get home from work. Still drives perfect. Anyone got any ideas?

 

[isis]

Wastegate rattle.

 

[Steebo]

Wastegate rattle.

Aw man... thanks for the input. I'm agreeing with you. I've seen a repair video for it and was hoping I wasnt in the same boat. I'll need to research it again but if I remember correctly, this is just a comfort issue. Just sucks driving down the road and the truck sounds like its breaking lol

 

[isis]

It’s not something that needs to be fixed unless it really bothers you. Mine goes away after 30 seconds or so.

 

[mattyz99]

I second the waste gate rattle, I would also recommend not to get on it until it comes up to temp,

 

[Steebo]

I second the waste gate rattle, I would also recommend not to get on it until it comes up to temp,

Agreed. I never run my rig hard unless temps are at least 165+ or a 10-15 minute drive.
Ah well at least it's nothing major like a timing chain or timing related issue so I can live with it. Like I said it only happens during cold starts when I completely let off the throttle even if the rpms are only at 2k. The noise only lasts a second when I do and only lasts for 2 or 3 decels (assuming truck is warming up fast enough to make the issue go away). Sounds like new turbos needs to be added on my list of mods

 

[Steebo]

So I still havent fixed the issue yet or havnt had it diagnosed since it seems to only be sound and nothing major. However I did notice that the noise doesnt appear when the truck is in neutral and slightly revving while cold. Only happens when the truck is in drive and I let off the accelerator. Doesnt happen during shifts either which boggles my mind. Still a wastegate flutter?

 

[isis]

Do you hear it at idle? That’s the only time I hear mine. Cold start idle from outside the truck. It’s not loud enough to hear much inside the ‘quiet cab’ unless a window is down.

 

[moonjim]

TSB 20-2016 fixes it had it done on mine took about an hr.

 

[FordTechOne]

TSB 20-2016 fixes it had it done on mine took about an hr.

That TSB only applies to 2017 models. To service a 2018+ the linkage would need to be replaced if it’s loose.