My 2013 FRS has a knocking sound but only in low speed - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

ClevelandFRS · 02-24-2020, 04:59 AM

My 2013 FRS in automatic (71k miles) has a knocking sound that only appears when the gas pedal is pressed and only under maybe 30mph or so. A gentle press on the pedal will start the sound after about 1-2 seconds and it will stay there until I either let off, or press down more.

I am of course going to have it looked at as soon as I can. But, was curious what the community might think off the top of their head and with experience in this model on what that could probably be.

This sound stops as soon as I let off the pedal or exceed roughly 30mph. Some advice is appreciated if you happened to have any idea of what this is. Could is likely be the Vacuum Pump that needs to be replaced?

tomm.brz · 02-24-2020, 05:11 AM

probably clutch/bearing, it always goes bad and makes crunchy sound
but you should do a video and try to catch it

ClevelandFRS · 02-24-2020, 05:27 AM

Quote:

Originally Posted by tomm.brz

probably clutch/bearing, it always goes bad and makes crunchy sound
but you should do a video and try to catch it

Here is a link to a short video I just made that showcases the sound problem. I caught a P0441 error code and failed the echeck, service center said to replace the gas cap first and drive it a bit. If that doesnt make the checkengine go away, then I need to replace another part for that.

I got the FRS back, heard this issue which I never had before coming from it, the knocking sound.

[ame]https://www.youtube.com/watch?v=VDENqxcqTPM[/ame]

tomm.brz · 02-24-2020, 06:07 AM

ok, not clutch, haven't expected that sound actually... no idea sorry

Tcoat · 02-24-2020, 08:34 AM

Brake booster pump on the AT cars. It is not an uncommon issue really.
You can wade through the wild guesses in this thread but the pump will most likely be it.

http://www.ft86club.com/forums/showthread.php?p=2447589

ClevelandFRS · 02-24-2020, 02:59 PM

Quote:

Originally Posted by Tcoat

Brake booster pump on the AT cars. It is not an uncommon issue really.
You can wade through the wild guesses in this thread but the pump will most likely be it.

http://www.ft86club.com/forums/showthread.php?p=2447589

Vacuum pump was my guess. Well, at least it wont be super expensive if that is the issue. Sigh...

norcalpb · 02-24-2020, 06:13 PM

Is it that Jetsons space ship noise?

ClevelandFRS · 02-25-2020, 10:37 AM

Quote:

Originally Posted by norcalpb

Is it that Jetsons space ship noise?

Not helpful.

Tcoat · 02-25-2020, 10:43 AM

Quote:

Originally Posted by norcalpb

Is it that Jetsons space ship noise?

Quote:

Originally Posted by ClevelandFRS

Not helpful.

I think he is referring to the "crickets" which although a perfectly reasonable question is a whole different noise than the booster pump.

norcalpb · 02-25-2020, 03:23 PM

Quote:

Originally Posted by ClevelandFRS

Not helpful.

I was actually just inquiring into your problem but it sounds like you got it all figured out.

Maybe when you have a problem that happens at “low speeds only”, take a video that’s not you idling in park?

ClevelandFRS · 02-25-2020, 04:29 PM

Quote:

Originally Posted by norcalpb

I was actually just inquiring into your problem but it sounds like you got it all figured out.

Maybe when you have a problem that happens at “low speeds only”, take a video that’s not you idling in park?

No need. The problem was the vacuum hose. It was completely disconnected. The sound is the same idling and also driving, it wouldn't have made a difference.

Anyway, the problem was corrected and its gone now. Lets hope it stays gone.

jflogerzi · 02-25-2020, 11:14 PM

Thanks for posting the solution as others will appreciate it when searching

Sent from my GM1915 using Tapatalk

02-24-2020, 04:59 AM	#1
ClevelandFRS Member Join Date: Feb 2020 Drives: Scion FRS 2013 Location: Cleveland Posts: 22 Thanks: 0 Thanked 4 Times in 3 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	My 2013 FRS has a knocking sound but only in low speed My 2013 FRS in automatic (71k miles) has a knocking sound that only appears when the gas pedal is pressed and only under maybe 30mph or so. A gentle press on the pedal will start the sound after about 1-2 seconds and it will stay there until I either let off, or press down more. I am of course going to have it looked at as soon as I can. But, was curious what the community might think off the top of their head and with experience in this model on what that could probably be. This sound stops as soon as I let off the pedal or exceed roughly 30mph. Some advice is appreciated if you happened to have any idea of what this is. Could is likely be the Vacuum Pump that needs to be replaced?

02-24-2020, 08:34 AM	#5
Tcoat Senior Member Join Date: Jul 2014 Drives: 2020 Hakone Location: London, Ont Posts: 69,845 Thanks: 61,656 Thanked 108,283 Times in 46,456 Posts Mentioned: 2495 Post(s) Tagged: 50 Thread(s)	Brake booster pump on the AT cars. It is not an uncommon issue really. You can wade through the wild guesses in this thread but the pump will most likely be it. http://www.ft86club.com/forums/showthread.php?p=2447589 __________________ Racecar spelled backwards is Racecar, because Racecar.

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02-24-2020, 05:11 AM	#2
tomm.brz Senior Member Join Date: Jan 2017 Drives: brz 2017 hksv2 Location: italy Posts: 2,196 Thanks: 500 Thanked 1,067 Times in 775 Posts Mentioned: 65 Post(s) Tagged: 0 Thread(s)	probably clutch/bearing, it always goes bad and makes crunchy sound but you should do a video and try to catch it

02-24-2020, 06:07 AM	#4
tomm.brz Senior Member Join Date: Jan 2017 Drives: brz 2017 hksv2 Location: italy Posts: 2,196 Thanks: 500 Thanked 1,067 Times in 775 Posts Mentioned: 65 Post(s) Tagged: 0 Thread(s)	ok, not clutch, haven't expected that sound actually... no idea sorry

02-24-2020, 06:13 PM	#7
norcalpb Senior Member Join Date: Oct 2013 Drives: 2013 BRZ, 2023 Model 3 Location: SF Bay Area Posts: 2,296 Thanks: 1,212 Thanked 861 Times in 570 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	Is it that Jetsons space ship noise?

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