follow ft86club on our blog, twitter or facebook.
FT86CLUB
Ft86Club
Speed By Design
Register Garage Members List Calendar Search Today's Posts Mark Forums Read

Go Back   Toyota GR86, 86, FR-S and Subaru BRZ Forum - FT86CLUB > Technical Topics > Issues | Warranty | Recalls / TSB

Issues | Warranty | Recalls / TSB Problems, issues, recalls, TSBs


User Tag List

Reply
 
Thread Tools Search this Thread
Old 03-24-2020, 06:41 PM   #1
Acanaceous
Junior Member
 
Join Date: Mar 2020
Drives: 2016 BRZ
Location: East Coast
Posts: 4
Thanks: 0
Thanked 6 Times in 4 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Strange Knocking Noise From Transmission?

As title says, there is a strange knocking or rattling noise coming from my transmission.

Background: Shifting into second in my 2016 BRZ makes a strange whirring noise when shifting under higher rpms (~4k+ RPM). This strange noise continued for a while as I figured it was just some wear noise despite the vehicle only having about 16k miles at first notice of the noise. I showed this noise to a more advanced friend and he stated it sounds like a faulty synchro.

Just last week as I was travelling down a 55 MPH highway, this noise became very evident. Strangely enough, the noise was only present when in 2nd, 4th, or 6th gear. 1st, 3rd, and 5th made no noise. I drove the vehicle the other day and attempted to replicate the noise with no success. The vehicle drove in a standard manner.

Below I have linked a google Drive file that is a 50 second clip of the noise. Alongside the noise, there is a rattling can; however, I am sure you all will be able to tell the difference as it is quite apparent. Any suggestions as to what this could be would be very appreciated. I am taking the vehicle tomorrow to the dealership for examination.

https://drive.google.com/open?id=1NB...uDWfWCjEK02Gld
Acanaceous is offline   Reply With Quote
The Following User Says Thank You to Acanaceous For This Useful Post:
humfrz (03-24-2020)
Old 03-24-2020, 09:17 PM   #2
humfrz
Senior Member
 
Join Date: May 2013
Drives: 2013 FR-S, white, MT
Location: Puyallup, WA
Posts: 25,362
Thanks: 20,377
Thanked 23,623 Times in 12,941 Posts
Mentioned: 575 Post(s)
Tagged: 2 Thread(s)
Welcome to our forum, Acanaceous , -

Do you have any power mods?

Have you slammed the transmission lately?

I have no idea of what may be ailing your transmission.

However, I will ring up our MT expert @Ultramaroon for you, to see if he has any ideas.

I think it's a good plan to have the shop take a look at it, check the fluid level and maybe even change the transmission oil.


humfrz
humfrz is offline   Reply With Quote
Old 03-24-2020, 09:40 PM   #3
beltax90
Senior Member
 
Join Date: Jan 2019
Drives: 2010 corolla
Location: california
Posts: 305
Thanks: 171
Thanked 258 Times in 133 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
It;s the next gen coming to say hello
beltax90 is offline   Reply With Quote
Old 03-24-2020, 09:52 PM   #4
Ultramaroon
tractions durs
 
Ultramaroon's Avatar
 
Join Date: Sep 2014
Drives: a 13 e8h frs
Location: vantucky, wa
Posts: 24,770
Thanks: 37,116
Thanked 24,895 Times in 13,598 Posts
Mentioned: 917 Post(s)
Tagged: 9 Thread(s)
Do you feel it in the gearshift lever? Does it correspond to engine braking? Coasting? Good recording.

__________________
Ultramaroon is offline   Reply With Quote
Old 03-24-2020, 11:43 PM   #5
Acanaceous
Junior Member
 
Join Date: Mar 2020
Drives: 2016 BRZ
Location: East Coast
Posts: 4
Thanks: 0
Thanked 6 Times in 4 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
@humfrz I've got a Jackson Racing supercharger on but otherwise bolt-ons such as a UEL header and catback. The noise discussed in the background information and not the posted video was around far before the supercharger was attached. I haven't banged on it no but your suggestion sounds about right.

@Ultramaroon Yeah sorry, it was a spur of the moment recording since I had already developed a suspicion regarding the transmission's integrity and had to have it recorded. The video posted exhibits a funky noise as a result of me depressing my clutch as I am coasting off of a first gear acceleration at a point where one would ordinarily shift into second. Here, I drop the shifter into 2nd, 4th, and 6th while never releasing the clutch. While in position of 2nd, 4th, and 6th gear, the noise emits. At a stop light, I check all of the positions in neutral using the same method described and nothing seems to happen.

Thank you all for the replies.
Acanaceous is offline   Reply With Quote
The Following User Says Thank You to Acanaceous For This Useful Post:
humfrz (03-25-2020)
Old 03-25-2020, 01:07 AM   #6
Ultramaroon
tractions durs
 
Ultramaroon's Avatar
 
Join Date: Sep 2014
Drives: a 13 e8h frs
Location: vantucky, wa
Posts: 24,770
Thanks: 37,116
Thanked 24,895 Times in 13,598 Posts
Mentioned: 917 Post(s)
Tagged: 9 Thread(s)
No, I mean that it's a good recording. Clear.


Humfrz oversells me. I'm stumped. Please let us know what you find.
__________________
Ultramaroon is offline   Reply With Quote
Old 03-25-2020, 01:41 AM   #7
Mr.ac
[insert cool phrase here]
 
Mr.ac's Avatar
 
Join Date: Aug 2015
Drives: BRZ Premium
Location: Central Coast CA
Posts: 2,253
Thanks: 647
Thanked 1,420 Times in 862 Posts
Mentioned: 29 Post(s)
Tagged: 0 Thread(s)
Are you on the oem clutch or have an ACT clutch?
What kind of tranny fluid do you have in it?

Take this with a grain of salt, but the last time I heard the same crunchy notchy sounds was when one of the clutch springs was about to come out. But that's a far off chance.

As for the tranny fluid you could try out changing it for another brand, or something other than oem.
__________________
New daily driver - Subaru BRZ Premium
Weekend fun/track car - '91 MR2 Turbo Gen3
Old daily driver - '88 MR2 Supercharged
Mr.ac is offline   Reply With Quote
The Following User Says Thank You to Mr.ac For This Useful Post:
humfrz (03-25-2020)
Old 03-25-2020, 01:55 AM   #8
Spuds
The Dictater
 
Spuds's Avatar
 
Join Date: Apr 2017
Drives: '13 Red Scion FRS
Location: MD-ish, USA
Posts: 4,350
Thanks: 10,884
Thanked 4,169 Times in 2,359 Posts
Mentioned: 36 Post(s)
Tagged: 0 Thread(s)
Only thing I can think of is a problem with the shifter-gearbox alignment. Possibly some mounting point is giving up, though that would be quite a strange issue.

This seems to be affecting three different collars but only on one side of the 1-2 and 3-4 collars (6th is it's own apparently). That is leading me to believe something has caused the gearbox or shifter to be misaligned in the longitudinal axis.

There's a good YouTube video here describing the internals

Spuds is offline   Reply With Quote
Old 03-25-2020, 12:27 PM   #9
Acanaceous
Junior Member
 
Join Date: Mar 2020
Drives: 2016 BRZ
Location: East Coast
Posts: 4
Thanks: 0
Thanked 6 Times in 4 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
@Mr.ac OEM clutch, the supercharger has been on for 4k miles and I was intending on replacing the clutch with an ACT. It has the same transmission fluid from factory.

@Spuds Longitudinal alignment was discussed by a friend of mine as his "final theory" so your theory would align with his. Thanks for the video link.

Thanks for the replies everyone, I'll be bringing the vehicle by the Subaru dealership today and will update the forum accordingly.
Acanaceous is offline   Reply With Quote
The Following User Says Thank You to Acanaceous For This Useful Post:
Spuds (03-25-2020)
Old 03-25-2020, 03:06 PM   #10
Acanaceous
Junior Member
 
Join Date: Mar 2020
Drives: 2016 BRZ
Location: East Coast
Posts: 4
Thanks: 0
Thanked 6 Times in 4 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Update: So it seem Occam's razor prevails once again in that the apparent cause of the noise was a dislodged bolt in the drive shaft causing it to knock against its surroundings. I drove the vehicle hard on the way back home and couldn't get a concerning noise to emit so I think it's fine for now. The shift into second seems considerably better now so I consider the issue at hand resolved for the time being.

Thank you all for your thoughts.
Acanaceous is offline   Reply With Quote
The Following 3 Users Say Thank You to Acanaceous For This Useful Post:
bcj (03-25-2020), Griever423 (03-25-2020), Mr.ac (03-25-2020)
Old 03-25-2020, 05:39 PM   #11
Decep
Senior Member
 
Join Date: May 2017
Drives: 2013 FR-S Series 10
Location: CA
Posts: 614
Thanks: 40
Thanked 248 Times in 166 Posts
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
yikes. glad you caught that.
__________________
2013 FR-S 10 Series ~50k
RCE SS-1 Coilovers
Corsa Catback
Edelbrock Supercharger
Decep is offline   Reply With Quote
The Following User Says Thank You to Decep For This Useful Post:
Griever423 (03-25-2020)
 
Reply

Tags
knock, noise, rattle, transmission, troubleshoot

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Knocking noise ! snk828 Issues | Warranty | Recalls / TSB 23 06-22-2019 04:27 PM
GT86 - Strange Knocking Sound Emissary_of_Pain Issues | Warranty | Recalls / TSB 30 06-12-2019 04:35 AM
Strange thud noise from transmission when downshifting JBezugs Issues | Warranty | Recalls / TSB 3 04-25-2018 04:37 PM
Idle knocking noise Kostamojen Issues | Warranty | Recalls / TSB 33 04-20-2018 01:09 PM
Knocking noise from LSD after FD swap Toyota86.ir Engine, Exhaust, Transmission 15 11-08-2015 03:02 AM


All times are GMT -4. The time now is 08:12 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
User Alert System provided by Advanced User Tagging v3.3.0 (Lite) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.

Garage vBulletin Plugins by Drive Thru Online, Inc.