Rumble coming from rear end? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

No Quarter · 06-25-2012, 09:17 PM

So...I have an FR-S Automatic Transmission. This only happens when the car is cold, and only the first time I put it in drive.

I start the car in the morning, back out of my driveway, shift into drive. Now for the fist 10 - 20 feet of driving forward, I have what feels like a vibration possibly coming from the rear differential? It kinda feels like when you drive over a rumble strip, not nearly as violent as a rumble strip, similar, kinda like 10% of what a rumble strip is.

The car is fine after that...drives and performs flawlessly the rest of the day.

Any ideas what the hell is going on?

the_3d_man · 06-25-2012, 09:27 PM

Most likely you park outside. If so, there's a good chance that your brake rotors are rusted over from the condensation of the night and that rumbling is the rust being worn off by the brake pads.

Any other theories?

Chewie4299 · 06-25-2012, 09:28 PM

Quote:

Originally Posted by the_3d_man

Most likely you park outside. If so, there's a good chance that your brake rotors are rusted over from the condensation of the night and that rumbling is the rust being worn off by the brake pads.

Any other theories?

This is most likely.

Try hitting your brakes lightly during those first few feet. If you feel them grab extra hard extra fast that is what's happening. If you don't feel this it doesn't mean that this isn't what's happening.

My Jeep's brakes suck. So when they get that extra bite after a little moisture it's extremely noticeable.

Lil Abner · 06-25-2012, 10:13 PM

Another option I notice in cold weather is the tires. The tires sit in a position, then cool down and become harder. After driving a bit the tires "loosen" back up, and all is well. If it only does it the first 10-20 feet, don't worry about it. Chances are you'll notice it more in the winter. This is normal for cars.

Spaceywilly · 06-25-2012, 10:14 PM

Quote:

Originally Posted by Lil Abner

Another option I notice in cold weather is the tires. The tires sit in a position, then cool down and become harder. After driving a bit the tires "loosen" back up, and all is well. If it only does it the first 10-20 feet, don't worry about it. Chances are you'll notice it more in the winter. This is normal for cars.

Yeah I was going to suggest this as well. It definitely hasn't been cool lately though, but I used to have this happen on my WRX summer tires when it got cold out. It feels exactly like the OP is describing. Maybe low tire pressure could cause it?

FakeWhiteMan · 06-25-2012, 10:52 PM

Are you doing 90 degree turns? When I leave my road it's like the diff is locking completely up.

Guaruja · 06-25-2012, 11:12 PM

Quote:

Originally Posted by FakeWhiteMan

Are you doing 90 degree turns? When I leave my road it's like the diff is locking completely up.

I agree. I've heard similar sound while taking a high speed / high G corner. Heard the same rumble strip sound, and TCS light turned on. My assumption is the same - that's the diff making noise...

Razz · 06-26-2012, 01:29 AM

I think we may have found Jimmy Hoffa.

Check your trunk for a dead body.

Loose jack/nut

Silver Bullet BRZ · 06-26-2012, 02:08 AM

Personally, I'd notify Optimus Prime.

Just sayin...

ZILLA · 06-26-2012, 03:00 PM

Quote:

Originally Posted by No Quarter

It kinda feels like when you drive over a rumble strip, not nearly as violent as a rumble strip, similar, kinda like 10% of what a rumble strip is.

The car is fine after that...drives and performs flawlessly the rest of the day.

Any ideas what the hell is going on?

I am having this EXACT same issue, it happens when I turn the wheel all the way (backing out of my driveway or making a U-turn)...

I am pretty concerned about this...

I have a BRZ manual FYI

ZILLA · 06-26-2012, 03:01 PM

Quote:

Originally Posted by the_3d_man

Most likely you park outside. If so, there's a good chance that your brake rotors are rusted over from the condensation of the night and that rumbling is the rust being worn off by the brake pads.

Any other theories?

DEFINITELY NOT that. This literally feels like youre driving over a rumble strip.

ZILLA · 06-26-2012, 03:02 PM

Quote:

Originally Posted by FakeWhiteMan

Are you doing 90 degree turns? When I leave my road it's like the diff is locking completely up.

YES! AGREED! Same here

ZILLA · 06-26-2012, 03:16 PM

I started a thread on the BRZ forum to see if anyone on there is experiencing this as well...

(remove the spaces in the URL)

www . subaru brz forum . com/9-subaru-brz-general-discussion-forum/2828-issue-rumble-coming-rear-end.html

rock · 06-26-2012, 03:17 PM

I had a truck that did the same thing, I thought it wad the transmission...

06-25-2012, 09:17 PM	#1
No Quarter Member Join Date: Jun 2012 Drives: 2013 Scion FR-S AT Hot Lava Location: New Hampshire Posts: 24 Thanks: 2 Thanked 19 Times in 7 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Rumble coming from rear end? So...I have an FR-S Automatic Transmission. This only happens when the car is cold, and only the first time I put it in drive. I start the car in the morning, back out of my driveway, shift into drive. Now for the fist 10 - 20 feet of driving forward, I have what feels like a vibration possibly coming from the rear differential? It kinda feels like when you drive over a rumble strip, not nearly as violent as a rumble strip, similar, kinda like 10% of what a rumble strip is. The car is fine after that...drives and performs flawlessly the rest of the day. Any ideas what the hell is going on?

06-26-2012, 02:08 AM	#9
Silver Bullet BRZ Member Join Date: Jun 2012 Drives: 2013 Subaru BRZ Limited Location: Sarasota, Florida Posts: 16 Thanks: 3 Thanked 2 Times in 2 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Personally, I'd notify Optimus Prime. Just sayin... __________________ "The Silver Bullet" / 2013 Subaru BRZ Limited / Sterling Silver Metallic

06-26-2012, 03:16 PM	#13
ZILLA BRZ #575 Join Date: Jun 2012 Drives: 2013 BRZ #575 Location: United States Posts: 46 Thanks: 1 Thanked 44 Times in 8 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I started a thread on the BRZ forum to see if anyone on there is experiencing this as well... (remove the spaces in the URL) www . subaru brz forum . com/9-subaru-brz-general-discussion-forum/2828-issue-rumble-coming-rear-end.html __________________ ZILLA BRZ #575 SWP Limited 18x8" Drag DR-31 +48 \| 235/40/18 \| 6000K HID Low/High \| Wrapped All Red Tail Lights \| Rear Fog + Brake Light Combo Mod [Video]

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
How to get that boxer rumble?	ryude	Engine, Exhaust, Transmission	45	03-20-2014 03:30 PM
Those who coming from the TC??	csaba	Scion FR-S / Toyota 86 GT86 General Forum	15	06-09-2012 01:18 AM
NJ- BRZ LIMITED COMING IN!!!!	Jalmeida830	BRZ First-Gen (2012+) — General Topics	48	06-02-2012 12:31 PM
When is the next shipment coming to LA?	Liquidsnake	Southern California	18	05-24-2012 02:03 PM
June 1st is coming up soon!	rcm47	Scion FR-S / Toyota 86 GT86 General Forum	11	05-22-2012 08:20 AM

06-25-2012, 09:27 PM	#2
the_3d_man Member Join Date: Mar 2012 Drives: 2007 Legacy GT Location: Houston/Indiana Posts: 63 Thanks: 2 Thanked 7 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Most likely you park outside. If so, there's a good chance that your brake rotors are rusted over from the condensation of the night and that rumbling is the rust being worn off by the brake pads. Any other theories?

06-25-2012, 10:13 PM	#4
Lil Abner Senior Member Join Date: Jun 2012 Drives: 2013 FR-S, 6MT, Ultramarine Location: Dublin, OH Posts: 161 Thanks: 6 Thanked 124 Times in 22 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Another option I notice in cold weather is the tires. The tires sit in a position, then cool down and become harder. After driving a bit the tires "loosen" back up, and all is well. If it only does it the first 10-20 feet, don't worry about it. Chances are you'll notice it more in the winter. This is normal for cars.

06-25-2012, 10:52 PM	#6
FakeWhiteMan Back From The Dead Join Date: May 2012 Drives: Hot Lava FR-S Location: CalCo MD Posts: 144 Thanks: 24 Thanked 21 Times in 16 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Are you doing 90 degree turns? When I leave my road it's like the diff is locking completely up.

06-26-2012, 01:29 AM	#8
Razz Senior Member Join Date: Jun 2012 Drives: Fast Location: United States Posts: 480 Thanks: 64 Thanked 101 Times in 71 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	I think we may have found Jimmy Hoffa. Check your trunk for a dead body. Loose jack/nut

06-26-2012, 03:17 PM	#14
rock Member Join Date: Apr 2012 Drives: FR-S Raven Location: tn Posts: 80 Thanks: 0 Thanked 9 Times in 9 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	I had a truck that did the same thing, I thought it wad the transmission...

User Name		Remember Me?
Password