exhaust adaptor/flapper drone noise - stop !

[Chillywilly]

2020 5.3L with 40K. 1100 to 1400 RPM and the drone won't shut up....Service Mgr at dealership say 'live with it', I say live without my business. Rant over...how do I fix this simply and effectively. Really want counsel from folks who have fixed it successfully.  Thanks in advance

[Bikerjon]

6 hours ago, Chillywilly said:

2020 5.3L with 40K. 1100 to 1400 RPM and the drone won't shut up....Service Mgr at dealership say 'live with it', I say live without my business. Rant over...how do I fix this simply and effectively. Really want counsel from folks who have fixed it successfully.  Thanks in advance

Are you running a stock exhaust/muffler?

[gemarsh]

15 hours ago, Chillywilly said:

2020 5.3L with 40K. 1100 to 1400 RPM and the drone won't shut up....Service Mgr at dealership say 'live with it', I say live without my business. Rant over...how do I fix this simply and effectively. Really want counsel from folks who have fixed it successfully.  Thanks in advance

Twist it open and tighten a hose clamp around it. Did that on a '15 GMC yukon after the first month.

 

Still on there today.

[Chillywilly]

Exhaust system is stock OEM. Tried to twist it both ways by hand, doesn’t budge. Putting a tool on it...mmm 

[Jackson Lanich]

If it was rusted or stuck shut, that's probably why you got the drone.

[Silverado4x4]

It probably stuck open I would spray it down with WD40 and try to spin it after It’s free you should be able to turn it with your fingers but it's defintely stuck.

[Hunter11]

I had it removed on my wifes GMC. You would be surprised how much of a restriction it is in the pipe. 

[Chillywilly]

k, hear u on the rusted’ or stuck’ perspective and applying WD40. Clearly spraying on the outside of the valve when the exhaust system is cold is the way...concerned the  residue of the WD40 on a hot exhaust system. 

[Silverado4x4]

4 hours ago, Chillywilly said:

k, hear u on the rusted’ or stuck’ perspective and applying WD40. Clearly spraying on the outside of the valve when the exhaust system is cold is the way...concerned the  residue of the WD40 on a hot exhaust system. 

OK did you get it free and able to spin it? Yeah don't take a chance spraying it on a hot exhaust.