Off throttle resonance at ~2900rpm - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

EAGLE5 · 03-23-2019, 08:41 PM

If I go off throttle at 3000rpm and slow down, around 2900 rpm, i get a strong resonance/vibration from the engine. Happens in different gears and only off throttle. Definitely from the engine compartment. This is after the recall. It didn't do this before the recall. Ideas? The video I have doesn't really capture the sound well.

humfrz · 03-23-2019, 09:42 PM

Maybe the throttle body chattering ? -

humfrz

mswbrz · 03-24-2019, 02:10 AM

Take it back before shit blows

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RZNT4R · 03-24-2019, 10:23 AM

Quote:

Originally Posted by jsimon7777

The video I have doesn't really capture the sound well.

Then I don't know what we're supposed to guess at.

Could be a heat shield on the exhaust manifold, but since the engine was just apart for a procedure that we know is problematic, can we really play it off lightly like that?

Go back to the dealer that did it.

EAGLE5 · 03-24-2019, 10:48 PM

Quote:

Originally Posted by RZNT4R

Then I don't know what we're supposed to guess at.

Could be a heat shield on the exhaust manifold, but since the engine was just apart for a procedure that we know is problematic, can we really play it off lightly like that?

Go back to the dealer that did it.

I will go back. No heat shield as there is a header. The vibration is from in front, not underneath. I've heard exhaust rattles. This is an engine vibration.

Ultramaroon · 03-24-2019, 10:56 PM

Quote:

Originally Posted by jsimon7777

I will go back. No heat shield as there is a header. The vibration is from in front, not underneath. I've heard exhaust rattles. This is an engine vibration.

Engine mount installed upside down? Somebody here discovered that after noticing the engine was crooked.

Loose?

soundman98 · 03-24-2019, 11:40 PM

i suspect a faulty turboencabulator.

Stang70Fastback · 03-25-2019, 12:03 AM

Don't lift. Problem solved. #QuitBeingAPu$$y

BRZnut · 03-25-2019, 07:03 AM

I would guess an issue with the motor mounts. Drive it with a tech at the dealer and see what they think.

Ultramaroon · 03-28-2019, 11:07 PM

Learn how to drive it yet?

toast · 04-01-2019, 02:57 PM

I don't know how they pull the engine - do they leave the transmission attached?

What happens if you push the clutch pedal in during the resonance? If it is only when the engine is connected to the driveshaft they could have not lined up the driveshaft back to its original orientation on the diff.

EAGLE5 · 04-01-2019, 04:34 PM

Quote:

Originally Posted by toast

I don't know how they pull the engine - do they leave the transmission attached?

What happens if you push the clutch pedal in during the resonance? If it is only when the engine is connected to the driveshaft they could have not lined up the driveshaft back to its original orientation on the diff.

It's at the dealer right now. Foreman did a ride with me and heard the sound. He seemed to think it's an exhaust rattle, but they have techniques to figure it out.

Putting the clutch in would kill the sound because the revs would immediately drop. There's no way to stay at 2900 rpm with no clutch in and no gas.

EAGLE5 · 04-03-2019, 09:42 PM

Well, I went in for the odd sound off throttle at 3000rpm. They did a bunch of listening and found a crack on my aftermarket header that I'd asked them to swap out during the original work but they hadn't done. Anyway, the car is great now, with no weird noises. Purrs like a kitten. Also no oil leaks anymore thanks to their work. So I'm happy. One Toyota of Oakland. The best service adviser ever is there, Chase. Super happy to work and stick with him.

Just a little more to add. I think they may have cracked it while removing the header to do the engine work. However, I can't blame them. This EL Borla has been through a lot, including several different owners.

03-24-2019, 11:40 PM	#7
soundman98 ProCrastinationConsultant Join Date: Sep 2013 Drives: '14 Ranger, '18 Tacoma 4Dr LB Location: chicago-ish Posts: 11,330 Thanks: 35,240 Thanked 13,673 Times in 6,781 Posts Mentioned: 98 Post(s) Tagged: 0 Thread(s)	i suspect a faulty turboencabulator. __________________ "The time you enjoy wasting is not wasted time"

03-25-2019, 12:03 AM	#8
Stang70Fastback A.K.A. Starlord Join Date: Oct 2013 Drives: 2015 Series.Blue Location: Illinois Posts: 1,842 Thanks: 845 Thanked 2,099 Times in 834 Posts Mentioned: 30 Post(s) Tagged: 3 Thread(s)	Don't lift. Problem solved. #QuitBeingAPu$$y __________________ . Check out my blog, read all about my BRZ adventures, and oogle my sweet cell-phone photos! You can also find me on Instagram, and on Facebook. Last edited by Stang70Fastback; 03-25-2019 at 12:27 AM.

03-28-2019, 11:07 PM	#10
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 36,516 Times in 18,918 Posts Mentioned: 1106 Post(s) Tagged: 9 Thread(s)	Learn how to drive it yet? __________________ service manuals

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03-23-2019, 09:42 PM	#2
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)	Maybe the throttle body chattering ? - humfrz

03-24-2019, 02:10 AM	#3
mswbrz Senior Member Join Date: Aug 2014 Drives: 2013 brz limited / galaxy blue Location: Oakdale Posts: 230 Thanks: 151 Thanked 66 Times in 43 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Take it back before shit blows Sent from my iPhone using Tapatalk

03-25-2019, 07:03 AM	#9
BRZnut Senior Member Join Date: Oct 2012 Drives: BRZ DGM Limited Location: USA Posts: 1,237 Thanks: 5 Thanked 431 Times in 250 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	I would guess an issue with the motor mounts. Drive it with a tech at the dealer and see what they think.

04-01-2019, 02:57 PM	#11
toast Senior Member Join Date: Jul 2014 Drives: 14 BSP Edelbrock BRZ Location: Lon Gisland Posts: 806 Thanks: 113 Thanked 450 Times in 256 Posts Mentioned: 12 Post(s) Tagged: 0 Thread(s)	I don't know how they pull the engine - do they leave the transmission attached? What happens if you push the clutch pedal in during the resonance? If it is only when the engine is connected to the driveshaft they could have not lined up the driveshaft back to its original orientation on the diff.

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