Knock? FIXED - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

ort895 · 10-29-2016, 08:36 PM

I know our engines sound like tractors, so i've tried not to let little things get under my skin. But the other day i am sitting in the driveway with my car running and my dad stops, stares at my car and asks if my engine is knocking, so now i am paranoid. What do you guys think?

[ame="https://www.youtube.com/watch?v=YCc7Xoo4Dzc"]Knock? - YouTube[/ame]

Alright boys and girls, its time for an update. The part finally came in and i had it installed by Parkway Subaru in Wilmington NC. They actually put it in for free for me because when i originally had the car being looked at i was just outside of warranty range, so i just want to give a big shoutout to them as they have always looked out for me.
So the actual part that they replaced was the Secondary air pump, creates a vacuum at idle and all that jazz.
Did it actually work? Well yes, the noise has completely gone away and now i can breathe again knowing its not a valve train issue or anything like that.

Ultramaroon · 10-29-2016, 08:38 PM

Is it an automatic?

edit: nvm. I see. I think it's that cam-driven pump on the right side.

Teseo · 10-29-2016, 08:40 PM

Sounds stock (normal)

Ultramaroon · 10-29-2016, 09:24 PM

Quote:

Originally Posted by Teseo

Sounds stock (normal)

Dude, that is NOT normal.

jerbull · 10-29-2016, 09:36 PM

Definitely not normal. Rev it and see if the sound follows the rpm.

chaoskaze · 10-29-2016, 09:50 PM

Get someone to stand out side to record the video while you rev it.

Sent from my iPhone using Tapatalk

Ultramaroon · 10-29-2016, 09:52 PM

That vacuum pump is at the back right corner of the engine.

Teseo · 10-29-2016, 10:13 PM

Quote:

Originally Posted by Ultramaroon

Dude, that is NOT normal.

Sorry, but i just got used to mechanical fuel pump on carburator engine. Also my car is flashed with oft and valvetrain are now loud

ort895 · 10-29-2016, 11:29 PM

I'll try and get an updated video tomorrow morning

Ultramaroon · 10-29-2016, 11:52 PM

Quote:

Originally Posted by Teseo

Sorry, but i just got used to mechanical fuel pump on carburator engine. Also my car is flashed with oft and valvetrain are now loud

Someone else here made an excellent recording of the failed vacuum pump then, I think, replaced the pump himself.

ShadowReaper · 10-30-2016, 11:17 AM

Most of those sounds are normal... but I hear a knocking sound at a random pace. That right there is not normal.

ort895 · 10-30-2016, 12:43 PM

Doesn't seem to carry with revving.

N1rve · 10-30-2016, 01:46 PM

I had that same noise...

https://www.dropbox.com/s/2ppc5iw92r...83517.mp4?dl=0

It was a deformed rocker arm.

Here's my thread.

http://www.ft86club.com/forums/showthread.php?t=81496

Ultramaroon · 10-30-2016, 05:21 PM

Quote:

Originally Posted by ort895

Doesn't seem to carry with revving.

That also fits with the vacuum pump failure.

Following that first case, my running theory (conclusion?) is that something in the pump causes it to lose clocking. Parts collide when there is no load on the pump and they bounce around.

It seems to run normally under load/higher speed.

edit: Nah. I'm full of shit. Thank god @N1rve posted. Here's the thread/sound I was thinking of.

10-29-2016, 08:36 PM	#1
ort895 Senior Member Join Date: Aug 2014 Drives: 2013 BRZ Location: North Carolina Posts: 695 Thanks: 195 Thanked 139 Times in 113 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Knock? FIXED I know our engines sound like tractors, so i've tried not to let little things get under my skin. But the other day i am sitting in the driveway with my car running and my dad stops, stares at my car and asks if my engine is knocking, so now i am paranoid. What do you guys think? [ame="https://www.youtube.com/watch?v=YCc7Xoo4Dzc"]Knock? - YouTube[/ame] Alright boys and girls, its time for an update. The part finally came in and i had it installed by Parkway Subaru in Wilmington NC. They actually put it in for free for me because when i originally had the car being looked at i was just outside of warranty range, so i just want to give a big shoutout to them as they have always looked out for me. So the actual part that they replaced was the Secondary air pump, creates a vacuum at idle and all that jazz. Did it actually work? Well yes, the noise has completely gone away and now i can breathe again knowing its not a valve train issue or anything like that. __________________ Yeah its an auto, deal with it. Last edited by ort895; 03-14-2017 at 10:29 AM.

10-29-2016, 08:38 PM	#2
Ultramaroon chicken tonight Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 31,944 Thanks: 52,290 Thanked 36,615 Times in 18,979 Posts Mentioned: 1109 Post(s) Tagged: 9 Thread(s)	Is it an automatic? edit: nvm. I see. I think it's that cam-driven pump on the right side. __________________ service manuals

10-29-2016, 09:52 PM	#7
Ultramaroon chicken tonight Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 31,944 Thanks: 52,290 Thanked 36,615 Times in 18,979 Posts Mentioned: 1109 Post(s) Tagged: 9 Thread(s)	That vacuum pump is at the back right corner of the engine. __________________ service manuals

10-29-2016, 11:29 PM	#9
ort895 Senior Member Join Date: Aug 2014 Drives: 2013 BRZ Location: North Carolina Posts: 695 Thanks: 195 Thanked 139 Times in 113 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	I'll try and get an updated video tomorrow morning __________________ Yeah its an auto, deal with it.

10-30-2016, 11:17 AM	#11
ShadowReaper Indulgent Tormenter Join Date: Dec 2015 Drives: 15' LTD Subaru BRZ DGM Location: FL Posts: 486 Thanks: 316 Thanked 128 Times in 87 Posts Mentioned: 4 Post(s) Tagged: 2 Thread(s)	Most of those sounds are normal... but I hear a knocking sound at a random pace. That right there is not normal. __________________ Instagram: 86_Maul

10-29-2016, 08:40 PM	#3
Teseo Senior Member Join Date: Jun 2014 Drives: frs Location: Gunsai Posts: 4,880 Thanks: 7,185 Thanked 2,922 Times in 1,769 Posts Mentioned: 23 Post(s) Tagged: 2 Thread(s)	Sounds stock (normal)

10-29-2016, 09:36 PM	#5
jerbull Member Join Date: Mar 2016 Drives: 2013 FRS Asphalt Location: Albany Ga Posts: 12 Thanks: 0 Thanked 5 Times in 2 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Definitely not normal. Rev it and see if the sound follows the rpm.

10-29-2016, 09:50 PM	#6
chaoskaze The Fail Boat Join Date: Aug 2011 Drives: CWP S.B. Location: LasVegas Posts: 3,028 Thanks: 4,718 Thanked 1,293 Times in 873 Posts Mentioned: 19 Post(s) Tagged: 0 Thread(s)	Get someone to stand out side to record the video while you rev it. Sent from my iPhone using Tapatalk

10-30-2016, 12:43 PM	#12
ort895 Senior Member Join Date: Aug 2014 Drives: 2013 BRZ Location: North Carolina Posts: 695 Thanks: 195 Thanked 139 Times in 113 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Doesn't seem to carry with revving. __________________ Yeah its an auto, deal with it.

10-30-2016, 01:46 PM	#13
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)	I had that same noise... https://www.dropbox.com/s/2ppc5iw92r...83517.mp4?dl=0 It was a deformed rocker arm. Here's my thread. http://www.ft86club.com/forums/showthread.php?t=81496 __________________ 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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