Vibration

[Sal]

I have a 2020 Fleetwood Fortis. I have a terrible very loud buzz sound coming out from under my dashboard. It starts buzzing just after 40mph and stops when I go below 40mph. It does not fluctuate with speed, it’s the same at 65mph as it is at 50mph. The engine (Ford V-10) is running great the transmission is shifting fine. I’ve been in the engine compartment to see if I see anything loose or binding. I see nothing. I checked all my jacks to be sure one of them wasn’t loose. I spoke to Fleetwood and they have no idea. I spoke to Ford and they said to bring it to a dealer which I will but they can’t get me in until sometime in March. I’m on the road right now. Any ideas out there?

 

[Scooterfan]

I had a similar noise at acceleration...once I eliminated the engine system being the cause I started looking into the venting (air) system and sure enough, a damper was loose and vibrating at a certain speed. It's worth looking at IMHO Good luck, tracing down "sounds" can be a challenge