Scratchy Noise and Peddle vibration - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Sovereign · 07-15-2022, 08:40 PM

Solved: Dented passenger side sway bar bracket

Background:
Hey guys, so I just recently hit a pretty decent sized rock and it sounded bad. I checked to see if anything fell off or broke but I did not see anything wrong in the engine bay and nothing hanging underneath the car.

Issue:
Now when I step on the throttle from standstill I hear a weird scratchy/sandy noise like something is dragging and a weird vibration on the gas peddle for a second or 2 then no vibration and sound. This was not there until I hit the rock. When I do a gentle start nothing vibrates or makes noise only when I do a harder start I hear and feel it. If I WOT while already moving the issue is not there and nothing while revving in neutral either. Any thoughts?

Specs:
2014 frs Mods: full exhaust, aftermarket wheels

JohnH · 07-15-2022, 09:48 PM

sounds to me like you damaged either the driveshaft or one of the axles. Also it could be that you damaged a brake backing plate and its touching the rotor, but being that you say it happens when you get on the gas, I would be looking at the driveshaft or one of the rear axles. Just a guess, but its based in logic

Sovereign · 07-15-2022, 10:58 PM

Quote:

Originally Posted by JohnH

sounds to me like you damaged either the driveshaft or one of the axles. Also it could be that you damaged a brake backing plate and its touching the rotor, but being that you say it happens when you get on the gas, I would be looking at the driveshaft or one of the rear axles. Just a guess, but its based in logic

It also sounded like glass breaking (might be hearing things) too but no visible glass is broken and nothing leaking either. But what you say makes sense might have to go to a shop. I went under my car today to look if any heat shielding might be rattling but nothing. Thank you

humfrz · 07-16-2022, 05:41 PM

I'd guess that something (like a heat shield or under panel) came lose or got bent by the rock. Maybe it only "hits" when the engine is torquing over.

I'd suggest you get your car up on a rack and look for something that may be hitting when the engine moves in the torquing position.

Bubba says to take a crowbar and bend away anything that looks like it might be touching something else -

Ultramaroon · 07-16-2022, 06:19 PM

pedal

Sovereign · 07-18-2022, 03:38 PM

@humfrz and @JohnH so it turns out I dented the passenger side sway bar bracket. Thanks for the responses for possible issues.

Decep · 07-19-2022, 05:31 PM

Quote:

Originally Posted by Ultramaroon

pedal

Begone. Peddle your spelling corrections elsewhere!

JohnH · 07-19-2022, 05:36 PM

Quote:

Originally Posted by Sovereign

@humfrz and @JohnH so it turns out I dented the passenger side sway bar bracket. Thanks for the responses for possible issues.

front or rear? and what was it touching?

07-15-2022, 08:40 PM	#1
Sovereign Legend Join Date: Jun 2014 Drives: Whiteout FR-S Location: SoCal Posts: 82 Thanks: 7 Thanked 9 Times in 5 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Scratchy Noise and Peddle vibration Solved: Dented passenger side sway bar bracket Background: Hey guys, so I just recently hit a pretty decent sized rock and it sounded bad. I checked to see if anything fell off or broke but I did not see anything wrong in the engine bay and nothing hanging underneath the car. Issue: Now when I step on the throttle from standstill I hear a weird scratchy/sandy noise like something is dragging and a weird vibration on the gas peddle for a second or 2 then no vibration and sound. This was not there until I hit the rock. When I do a gentle start nothing vibrates or makes noise only when I do a harder start I hear and feel it. If I WOT while already moving the issue is not there and nothing while revving in neutral either. Any thoughts? Specs: 2014 frs Mods: full exhaust, aftermarket wheels Last edited by Sovereign; 07-18-2022 at 03:38 PM. Reason: Solution

07-15-2022, 09:48 PM	#2
JohnH Professional wrench Join Date: Jun 2020 Drives: 2020 BRZ ST RS Location: BC Canada Posts: 114 Thanks: 57 Thanked 37 Times in 28 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	sounds to me like you damaged either the driveshaft or one of the axles. Also it could be that you damaged a brake backing plate and its touching the rotor, but being that you say it happens when you get on the gas, I would be looking at the driveshaft or one of the rear axles. Just a guess, but its based in logic __________________ 2020 BRZ Sport Tech RS World Rally Blue '18 TS Suspension, camber bolts, custom align Perrin intake pipe, custom airbox/cold air Gruppe-S UEL header/overpipe Wayne Rom Stg 2 tune

07-16-2022, 06:19 PM	#5
Ultramaroon 義理チョコ Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 31,865 Thanks: 52,120 Thanked 36,513 Times in 18,917 Posts Mentioned: 1106 Post(s) Tagged: 9 Thread(s)	pedal __________________ service manuals

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07-16-2022, 05:41 PM	#4
humfrz Senior Member Join Date: May 2013 Drives: 2013 FR-S, white, MT Location: Puyallup, WA Posts: 29,866 Thanks: 28,787 Thanked 31,813 Times in 16,424 Posts Mentioned: 708 Post(s) Tagged: 2 Thread(s)	I'd guess that something (like a heat shield or under panel) came lose or got bent by the rock. Maybe it only "hits" when the engine is torquing over. I'd suggest you get your car up on a rack and look for something that may be hitting when the engine moves in the torquing position. Bubba says to take a crowbar and bend away anything that looks like it might be touching something else -

07-18-2022, 03:38 PM	#6
Sovereign Legend Join Date: Jun 2014 Drives: Whiteout FR-S Location: SoCal Posts: 82 Thanks: 7 Thanked 9 Times in 5 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	@humfrz and @JohnH so it turns out I dented the passenger side sway bar bracket. Thanks for the responses for possible issues.

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