Knocking underneath the Hood !! - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

swaavor · 10-31-2016, 01:10 PM

I checked out some of the other people with the same sound and problem= Bent Rocker Arm. But i can't get it to make the knocking again no matter what i do it wont. They want me to bring it in but what if they can't mimmic the knock then im out of a car for 3 days..

swaavor · 10-31-2016, 01:11 PM

@N1rve i read the whole thread on your problem but i can't make it knock. maybe you know somehow too.

N1rve · 10-31-2016, 02:41 PM

Quote:

Originally Posted by swaavor

@N1rve i read the whole thread on your problem but i can't make it knock. maybe you know somehow too.

For me I just let the car idle. I think it was when the car was hot it was more prevalent, not when the car was cold.

i heart ricers · 10-31-2016, 03:13 PM

whos there?

swaavor · 10-31-2016, 03:20 PM

Quote:

Originally Posted by N1rve

For me I just let the car idle. I think it was when the car was hot it was more prevalent, not when the car was cold.

Im putting a video up of it and the only way to get it to knock is letting it drop almost below 500rpms and tapping the pedal.

Da Brz · 10-31-2016, 03:52 PM

It sounds like an FRS/BRZ to me. Mine rattles, clanks, shakes, dips and chirps all the time. It's just how they are AFAIK.

NyC Zn6 · 11-03-2016, 02:57 PM

Yea mines has been making that knocking sound for 3 years.

go_a_way1 · 11-03-2016, 03:26 PM

Mine has been knocking for 3 years as well. I am running 10PSI of boost on it now too and so far nothing has broken at roughly 280-300WHP

Icecreamtruk · 11-03-2016, 04:02 PM

So the solution to this problem seems to be to slap on a turbo, got it.

go_a_way1 · 11-03-2016, 04:08 PM

Quote:

Originally Posted by Icecreamtruk

So the solution to this problem seems to be to slap on a turbo, got it.

lamo no I only mention that to help the OP sleep better at night knowing its not a big deal and his motor wont crater

Tcoat · 11-03-2016, 04:15 PM

Quote:

Originally Posted by go_a_way1

Mine has been knocking for 3 years as well. I am running 10PSI of boost on it now too and so far nothing has broken at roughly 280-300WHP

LOL We all know you have a turbo now. Very creative way to shoehorn it into the thread though.

go_a_way1 · 11-03-2016, 04:22 PM

Quote:

Originally Posted by Tcoat

LOL We all know you have a turbo now. Very creative way to shoehorn it into the thread though.

No one is ever gonna read my build thread

Ultramaroon · 11-03-2016, 06:59 PM

Quote:

Originally Posted by swaavor

Im putting a video up of it and the only way to get it to knock is letting it drop almost below 500rpms and tapping the pedal.

Humor me. Take another clip doing exactly the same thing except this time, keep the clutch pedal mashed to the floor.

Also, while it's idling, release the clutch pedal and press it a couple times. I predict all will come clear and you will be relieved.

What we all hear are the disengaged gears being knocked around with each firing pulse of the engine. Given the high compression ratio, the flywheel is already about as light as reasonable for a street vehicle.

Take note, people. That is how you actually help alleviate OP's concern; by explaining it. *leans back in chair smugly*

Lantana frs · 11-03-2016, 07:16 PM

Idler or tension pulley? Doesn't sound bad to me.

10-31-2016, 01:10 PM	#1
swaavor Member Join Date: Oct 2016 Drives: frs Location: wv Posts: 14 Thanks: 3 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Knocking underneath the Hood !! I checked out some of the other people with the same sound and problem= Bent Rocker Arm. But i can't get it to make the knocking again no matter what i do it wont. They want me to bring it in but what if they can't mimmic the knock then im out of a car for 3 days..

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10-31-2016, 01:11 PM	#2
swaavor Member Join Date: Oct 2016 Drives: frs Location: wv Posts: 14 Thanks: 3 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	@N1rve i read the whole thread on your problem but i can't make it knock. maybe you know somehow too.

10-31-2016, 03:13 PM	#4
i heart ricers Senior Member Join Date: Mar 2015 Drives: g37 - 370z Location: pistolvania Posts: 163 Thanks: 1 Thanked 34 Times in 22 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	whos there?

10-31-2016, 03:52 PM	#6
Da Brz Senior Member Join Date: Jun 2016 Drives: 2016 Subaru BRZ Location: Arkansas Posts: 208 Thanks: 24 Thanked 70 Times in 51 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	It sounds like an FRS/BRZ to me. Mine rattles, clanks, shakes, dips and chirps all the time. It's just how they are AFAIK.

11-03-2016, 02:57 PM	#7
NyC Zn6 Senior Member Join Date: Apr 2013 Drives: 10 Series #974 6m/t Location: NYC Posts: 1,956 Thanks: 1,358 Thanked 1,141 Times in 669 Posts Mentioned: 6 Post(s) Tagged: 2 Thread(s)	Yea mines has been making that knocking sound for 3 years.

11-03-2016, 04:02 PM	#9
Icecreamtruk Senior Member Join Date: Dec 2015 Drives: Track preped NA FRS Location: Montreal, Canada Posts: 987 Thanks: 1,056 Thanked 681 Times in 405 Posts Mentioned: 12 Post(s) Tagged: 0 Thread(s)	So the solution to this problem seems to be to slap on a turbo, got it.

11-03-2016, 07:16 PM	#14
Lantana frs Senior Member Join Date: Jun 2016 Drives: 13 frs red Location: Lantana fl Posts: 448 Thanks: 51 Thanked 198 Times in 115 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Idler or tension pulley? Doesn't sound bad to me.

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