Clownshoes

iTrader: (1)

So, I am wondering if anyone else here has experienced this and if so, what have you done about it.

When driving at 50 mph with the windows up and the sun roof open, I get a loud harmonic vibration that renders the rear view mirror completely useless. I duplicated the problem several times. At an indicated 50 mph, the vibration will come on slowly and crescendo into a loud consistent hum. I can relieve the vibration by rolling down a window, which slowly dissipates the issue, or by manually compressing the little air deflector on the leading edge of the sun roof opening.

I am not an aerodynamicist, but I am wondering if a rear window diffuser would fix this issue. Could be a great excuse to get one. I really only like to put mods on my car that actually do something. It’s a personal tick and only applies to me and my car. I’d rather not put one of those dome looking thingies that go on front of the sun roof to alleviate this issue. If I can find a safe place to do so, I may try to take a video of the issue, but for now this written explanation will have to suffice, has anyone else had this happen?

daedalus

iTrader: (2)

Weird... i've found the ISF to be the only car i've ever owned I can have the windows up and the sunroof open and not have any harmonic vibration in the car...

I would think though that you'd need to deflect more air before the sunroof, not after so I don't know how a rear window diffuser would play into fixing the problem?

Clownshoes

iTrader: (1)

That is what I am thinking too, but I have seen in some aerodynamic studies that altering the area behind a certain area can have an effect on what happens ahead of it. Like a rock in a river, the water "stacks" up and has to find a way around it.

Just thinking out loud

Evil Teo

iTrader: (13)

from what I know there was a TSB for the rearview mirror when you are opening the sunroof it vibrates...but this is totally different since your moving but check the dealer if your still within warranty and see if that fixes the problem. I don't use the sun roof too much and if I do I use it the other way by having it push up instead of opening it all the way.

Clownshoes

iTrader: (1)

Will do, thanks!

Sello

If my sunroof is open my rear view mirror takes views of the floor

haydog

I can have ALL windows down and sunroof open my rear view mirror vibrates like crazy. All windows up and sunroof open. No vibrations.

Lets Drive

iTrader: (3)

Minus the rear windows (since I rarely touch them), this has been my experience. Vibration is mainly affected by lowering other windows, in tandem with the roof.

Clownshoes

iTrader: (1)

Are you guys getting an audible sound along with the vibration? I am, and it is pretty loud.

Murph145

i had this experience with all windows up and sunroof open on freeway it vibrated so loud i thought a window was going to blow out! damn scary actually i should take it to the dealer and show them

Clownshoes

iTrader: (1)

This is what I am talking about. I thought my car was having an aneurism…

I think some video may be necessary. Will be interesting to figure it out and fix it.

Usually, I would be miffed about something like this, but with the ISF, I am just stoked to have one. Finally.

farpetrad

Hmm never had that happen with the sun roof but if I open the back windows wih the front up and sunroof closed I get that nasty harmonic.

Lets Drive

iTrader: (3)

Nothing that I feel is abnormal. It can be altered by playing with the moonroof wind deflector, but never extreme noise.

2008ISF

iTrader: (1)

Try reading through this...

https://www.clublexus.com/forums/is-...f-problem.html

I have had the same problem. Reduced quite a bit by changing out some rubber stoppers that sit on the wind deflector. The TSB is L-SB-0061-11.

Hope that helps.

Clownshoes

iTrader: (1)

Very helpful. Thanks! I'll check with the local dealer to see if that TSB has been applied to my car.