Rear Knock Developed @ 7,000mi - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

cpnslow · 04-17-2014, 04:08 PM

I've been hearing a pretty noticeable knock/pop/crack sound from my passenger-side rear corner for a month or so now.

It started around 7,000mi, so I brought the car in to Capitol Subaru service, they did a quick inspection and test drive, and found nothing. (I got back in the car and the radio was on, were they listening for the noise or just cruising in my car?)

A few weeks later, I brought the car to Stevens Creek service (wayyy better service here, as I'll soon discover) for my 7,500mi appointment. I had them do another check and they discovered the sway bar link nut was loose by about 3 full turns.

Well... turns out that wasn't the problem. I let two weeks go by, and now the knock happens over any uneven road surface at any speed. (video link below) I brought the car back to Stevens Creek this morning and the service manager took the car for a spin, he heard it immediately. They said the car isn't safe to drive and gave me a 2015 Forester loaner. I'll keep you all updated!

[ame="https://www.youtube.com/watch?v=QAujlh1eNWg"]BRZ Knocking Sound - YouTube[/ame]

humfrz · 04-17-2014, 05:39 PM

Yes, please do.

Did they say what they suspected was making that sound .. ??

humfrz

mashal · 04-17-2014, 05:50 PM

that definitely doesnt sound good

cpnslow · 04-17-2014, 11:21 PM

Quote:

Originally Posted by humfrz

Did they say what they suspected was making that sound .. ??

They said it sounds like part of the structure in the strut tower may have failed, possibly a weld. My car is totally stock.

humfrz · 04-18-2014, 12:27 AM

Quote:

Originally Posted by cpnslow

They said it sounds like part of the structure in the strut tower may have failed, possibly a weld. My car is totally stock.

Well, then .... that ought to fix up so it's good as new ....

humfrz

6speed_Sam · 04-18-2014, 12:47 AM

That sucks. Mine had a knock on the passenger-side rear for a while when I would cruise at 70+mph. Turned out to be my oem spoiler was flapping around. The double-sided tape had let go.

N1rve · 04-18-2014, 04:34 AM

That sounds like the frame is falling apart. :O

It doesn't sound good at all... interested to know what it is.

wheelhaus · 04-18-2014, 09:29 AM

Technically the rear shocks aren't struts, it's just a shock so it takes no lateral loads.

I'm having a hard time deciphering what noise you're talking about in the video, is it the higher pitch pop/click (heard from 5-9sec and again at 20sec) or the lower pitch thunk/groan sound heard from 9-12sec?

The noise could be from the shock assembly itself, or any of the suspension components, or it could be the rear deck pop/noise many members had a while back.
http://www.ft86club.com/forums/showt...r+deck+popping

Ghost 86 · 04-18-2014, 05:36 PM

My frs drivers side shock went bad around 5k miles replaced under warranty. I had that same noise drove me nuts

cpnslow · 04-18-2014, 10:48 PM

Just got my car back. The service team said they had found popping coming from several sources and "adjusted several weld areas and lubricated". Driving home, I heard nothing. I'll let you all know if it comes back.

cpnslow · 04-18-2014, 10:55 PM

Quote:

Originally Posted by wheelhaus

I'm having a hard time deciphering what noise you're talking about in the video, is it the higher pitch pop/click (heard from 5-9sec and again at 20sec) or the lower pitch thunk/groan sound heard from 9-12sec?

You can hear it twice pretty clearly at 10 and 11 seconds, its a high pitch pop.

gramicci101 · 04-18-2014, 11:06 PM

Quote:

Originally Posted by cpnslow

"adjusted several weld areas and lubricated".

What does "adjusted several weld areas" mean? They rewelded something?

wheelhaus · 04-18-2014, 11:28 PM

probably bent, er, I mean "tweaked" something...

humfrz · 04-19-2014, 03:52 AM

Quote:

Originally Posted by wheelhaus

probably bent, er, I mean "tweaked" something...

.....

....... most likely with a big hammer, then squirted some WD-40 around the area .....

humfrz

04-18-2014, 12:47 AM	#6
6speed_Sam Thumper Join Date: Dec 2012 Drives: 2013 FRS Location: Huntsville, AL Posts: 250 Thanks: 97 Thanked 59 Times in 42 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	That sucks. Mine had a knock on the passenger-side rear for a while when I would cruise at 70+mph. Turned out to be my oem spoiler was flapping around. The double-sided tape had let go. __________________ Car is gone - parts for sale

04-18-2014, 04:34 AM	#7
N1rve Senior Member Join Date: Oct 2013 Drives: 2019 BMW ///M4 Location: Los Angeles, CA Posts: 2,332 Thanks: 102 Thanked 1,167 Times in 714 Posts Mentioned: 28 Post(s) Tagged: 0 Thread(s)	That sounds like the frame is falling apart. :O It doesn't sound good at all... interested to know what it is. __________________ N1rve 2019 BMW ///M4 - Alpine White \| Sakhir Orange/Black Leather \| M-DCT \| Executive Package \| 19" Black 437M Wheels \| Carbon Fiber Trim \| Sunroof \| Active Blind Spot \| Heated Steering Wheel \| Adaptive M Suspension

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04-17-2014, 05:39 PM	#2
humfrz Senior Member Join Date: May 2013 Drives: 2013 FR-S, white, MT Location: Puyallup, WA Posts: 29,937 Thanks: 28,899 Thanked 31,954 Times in 16,478 Posts Mentioned: 709 Post(s) Tagged: 2 Thread(s)	Yes, please do. Did they say what they suspected was making that sound .. ?? humfrz

04-17-2014, 05:50 PM	#3
mashal DADA Join Date: Jun 2012 Drives: 2013 Location: Kanada Posts: 1,500 Thanks: 47 Thanked 388 Times in 249 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	that definitely doesnt sound good

04-18-2014, 09:29 AM	#8
wheelhaus Join Date: Jul 2012 Drives: 2013 BRZ, 2020 KTM Super Duke 1290R Location: Denver Posts: 1,788 Thanks: 714 Thanked 1,141 Times in 624 Posts Mentioned: 49 Post(s) Tagged: 1 Thread(s)	Technically the rear shocks aren't struts, it's just a shock so it takes no lateral loads. I'm having a hard time deciphering what noise you're talking about in the video, is it the higher pitch pop/click (heard from 5-9sec and again at 20sec) or the lower pitch thunk/groan sound heard from 9-12sec? The noise could be from the shock assembly itself, or any of the suspension components, or it could be the rear deck pop/noise many members had a while back. http://www.ft86club.com/forums/showt...r+deck+popping

04-18-2014, 05:36 PM	#9
Ghost 86 Senior Member Join Date: May 2013 Drives: 2013 Whiteout FR-S Location: Maineville OH (Landen) Posts: 104 Thanks: 12 Thanked 40 Times in 22 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	My frs drivers side shock went bad around 5k miles replaced under warranty. I had that same noise drove me nuts

04-18-2014, 11:28 PM	#13
wheelhaus Join Date: Jul 2012 Drives: 2013 BRZ, 2020 KTM Super Duke 1290R Location: Denver Posts: 1,788 Thanks: 714 Thanked 1,141 Times in 624 Posts Mentioned: 49 Post(s) Tagged: 1 Thread(s)	probably bent, er, I mean "tweaked" something...

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