'Fluttering'/soft rattle at speed - Page 3 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Nepenthe · 07-04-2012, 03:20 PM

I've had a bit of a rattle inside and my passengers have been NO help in tracking it down. I have only taken my FR-S on the highway one time for about two miles, have not had it above about 62 mph indicated (has only around 600ish miles now). The rattle happens at various speeds.

I'm pretty sure I'll just have to live with it. With all the road destruction going on these days around here, finding smooth pavement is rare.

One thing I did find early on was that the rear low mounted lighting assembly seemed fairly loose and rattly to the touch underneath the car, so I wedged in some adhesive damping pads. Not sure if that helped at all.

ultra · 07-09-2012, 09:35 AM

Quote:

Originally Posted by Citified

I've heard a similar sound at speed. My first thought was that the sound was coming from the dash vents. It seemed to me that the intake for the cabin circulation system must be pointed forward and that air pressure at high speeds was causing the fans or diffusers to get overwhelmed and make noises in protest. I only hear the noise at 65-70+ mph, so it's definitely speed related.

Quote:

Originally Posted by YukiHachiRoku

just noticed this today, but it seems to happen more when I'm at WoT.... my buddy was in the car, we thought the sound was also coming from the top of the dash or in the vents as well.

We had the windows rolled up since I just washed the car and didn't want water to get all over the windows.... It was intriguing. It felt like vibration with air intake baffle thingy, idk it's weird thouoh...

could it be crankshaft or cams rattling?

no check engine light or anything though.

Same boat. Rattling sound *apparently* coming from the dash under WOT or heavy acceleration.

Doesn't seem to happen under mild acceleration or when revving with the clutch out.

Any clue what it is yet guys?

KHANrad_SIN · 12-21-2016, 07:28 PM

It's a pretty old thread but I thought I'd chime in. I had that flapping noise too. It only appeared at highway speeds at around 70mph cruising. It sounded like it was coming from the passenger side rear (perhaps near the wheel well). Turns out it was. It was the rear plastic covering for the wheel well. If you tap it you can hear it hitting the metal behind it. I just lifted it up a bit and put some double sided foam tape and the sound has gone away for now.......

DocWalt · 12-21-2016, 08:15 PM

Quote:

Originally Posted by KHANrad_SIN

It's a pretty old thread but I thought I'd chime in. I had that flapping noise too. It only appeared at highway speeds at around 70mph cruising. It sounded like it was coming from the passenger side rear (perhaps near the wheel well). Turns out it was. It was the rear plastic covering for the wheel well. If you tap it you can hear it hitting the metal behind it. I just lifted it up a bit and put some double sided foam tape and the sound has gone away for now.......

I had the exact same issue, with the same fix.

Ganthrithor · 12-21-2016, 11:31 PM

Quote:

Originally Posted by Symbiont

I've been noticing a slight sound coming from the right rear when I am traveling about 75-85 mph. It sounds like something is fluttering or a hard plastic rattling. I have looked all over the area and can't find anything loose. I may take the car in for the dealer to look at, but I'd love to hear if anyone has any ideas what may be causing it.

Take literally everything out of the car (all your personal things). Then try again. Rule out things in your coin tray / glove box / wherever first.

JD001 · 12-22-2016, 06:18 AM

Say no more... are you sure no one has left an intentional "gap" in the exhaust....

Tcoat · 12-22-2016, 06:42 AM

Between my exhaust, radio and tire noise I don't think I would know if I had a soft rattle if there was one.

carbonBLUE · 12-22-2016, 01:23 PM

Quote:

Originally Posted by Tcoat

Between my exhaust, radio and tire noise I don't think I would know if I had a soft rattle if there was one.

I think people have forgotten that the underbody panels flap a little . There's a spot where two panels are secured by 1 fastener over seas. In the US there is only 1 panel there and it creates a small gap due to the absence of the second panel that small space flaps up and down at speed. Stick a washer in it and you are good to go no rattle

12-22-2016, 06:18 AM	#34
JD001 Senior Member Join Date: Apr 2015 Drives: Subaru BRZ Location: UK Posts: 6,030 Thanks: 7,654 Thanked 6,188 Times in 3,475 Posts Mentioned: 25 Post(s) Tagged: 2 Thread(s)	Say no more... are you sure no one has left an intentional "gap" in the exhaust.... Attached Images Last edited by JD001; 12-22-2016 at 07:19 AM.

12-22-2016, 06:42 AM	#35
Tcoat Senior Member Join Date: Jul 2014 Drives: 2020 Hakone Location: London, Ont Posts: 69,845 Thanks: 61,656 Thanked 108,285 Times in 46,456 Posts Mentioned: 2495 Post(s) Tagged: 50 Thread(s)	Between my exhaust, radio and tire noise I don't think I would know if I had a soft rattle if there was one. __________________ Racecar spelled backwards is Racecar, because Racecar.

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07-04-2012, 03:20 PM	#29
Nepenthe Member Join Date: Jun 2012 Drives: 2013 Argento Silver Automatic FR-S Location: Keller, TX Posts: 87 Thanks: 35 Thanked 34 Times in 12 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I've had a bit of a rattle inside and my passengers have been NO help in tracking it down. I have only taken my FR-S on the highway one time for about two miles, have not had it above about 62 mph indicated (has only around 600ish miles now). The rattle happens at various speeds. I'm pretty sure I'll just have to live with it. With all the road destruction going on these days around here, finding smooth pavement is rare. One thing I did find early on was that the rear low mounted lighting assembly seemed fairly loose and rattly to the touch underneath the car, so I wedged in some adhesive damping pads. Not sure if that helped at all.

12-21-2016, 07:28 PM	#31
KHANrad_SIN Member Join Date: Oct 2014 Drives: Whiteout Location: Las Vegas Posts: 11 Thanks: 0 Thanked 3 Times in 2 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	It's a pretty old thread but I thought I'd chime in. I had that flapping noise too. It only appeared at highway speeds at around 70mph cruising. It sounded like it was coming from the passenger side rear (perhaps near the wheel well). Turns out it was. It was the rear plastic covering for the wheel well. If you tap it you can hear it hitting the metal behind it. I just lifted it up a bit and put some double sided foam tape and the sound has gone away for now.......

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