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

Pil · 05-04-2020, 02:45 AM

*

Tcoat · 05-04-2020, 07:50 AM

What year car? Are there any CELs or codes?

Lantanafrs2 · 05-04-2020, 08:01 AM

Both valves leaking quite a bit. Head has to come off. I would suspect valve springs as well given the circumstances of the failure

Pil · 05-04-2020, 08:13 AM

Quote:

Originally Posted by Tcoat

What year car? Are there any CELs or codes?

Late 2013, just right outside the recall range.

CEL was blinking intermittently when it happened.

P0304 showed up (for me), not sure if any other codes popped up at the workshop.

Tcoat · 05-04-2020, 08:16 AM

Quote:

Originally Posted by Pil

Late 2013, just right outside the recall range.

CEL was blinking intermittently when it happened.

P0304 showed up (for me), not sure if any other codes popped up at the workshop.

No audible rattles or other strange noises? A broken or week valve spring could indeed cause a misfire.

Pil · 05-04-2020, 08:20 AM

Quote:

Originally Posted by Tcoat

No audible rattles or other strange noises?

None out of the ordinary.

Car started spluttering in stop-go traffic with no warning beforehand.

Tcoat · 05-04-2020, 08:31 AM

Quote:

Originally Posted by Pil

None out of the ordinary.

Car started spluttering in stop-go traffic with no warning beforehand.

Sorry for all the questions! Stock? no mods?
Could be a weak spring but it would be very unusual when outside the recall window.

Pil · 05-04-2020, 08:40 AM

Quote:

Originally Posted by Tcoat

Sorry for all the questions! Stock? no mods?
Could be a weak spring but it would be very unusual when outside the recall window.

No need for apologies! Happy to supply answers.

Cooling mods like radiator & oil cooler, suspensions, brake, fluids. Nothing to increase stock engine output.

Tcoat · 05-04-2020, 08:47 AM

Quote:

Originally Posted by Pil

No need for apologies! Happy to supply answers.

Cooling mods like radiator & oil cooler, suspensions, brake, fluids. Nothing to increase stock engine output.

The only thing that has me really questioning valve spring issues is that they usually show up at higher RPMs but you said it is mostly at lower.

Pil · 05-04-2020, 08:48 AM

Quote:

Originally Posted by Tcoat

it would be very unusual when outside the recall window.

Yeah, that's what they told me too. That's why they didn't believe it would be the springs at the beginning.

Pil · 05-04-2020, 08:52 AM

Quote:

Originally Posted by Tcoat

The only thing that has me really questioning valve spring issues is that they usually show up at higher RPMs but you said it is mostly at lower.

When you say it shows up at higher RPM, does that mean that the misfiring should have started only at high RPMs? or just the symptoms (strange noises as you mentioned)

Lantanafrs2 · 05-04-2020, 09:08 AM

Valve springs generally fail at high rpm when they're under stress but a flawed or overworked spring can fail anytime regardless of rpm.

Pil · 05-04-2020, 09:12 AM

Quote:

Originally Posted by Lantanafrs2

Valve springs generally fail at high rpm when they're under stress but a flawed or overworked spring can fail anytime regardless of rpm.

Ah! Thanks for the clarification. Would make sense since the car has been tracked regularly for the past 5 years.

Opie · 05-04-2020, 09:42 AM

How many miles on the car? Any chance of carbon buildup causing valves to not seat?

05-04-2020, 02:45 AM	#1
Pil Member Join Date: May 2020 Drives: 86 Location: NSFW Posts: 14 Thanks: 1 Thanked 2 Times in 2 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	? * Last edited by Pil; 03-02-2021 at 02:02 AM.

05-04-2020, 07:50 AM	#2
Tcoat Senior Member Join Date: Jul 2014 Drives: 2020 Hakone Location: London, Ont Posts: 69,845 Thanks: 61,656 Thanked 108,286 Times in 46,456 Posts Mentioned: 2495 Post(s) Tagged: 50 Thread(s)	What year car? Are there any CELs or codes? __________________ Racecar spelled backwards is Racecar, because Racecar.

05-04-2020, 08:01 AM	#3
Lantanafrs2 Senior Member Join Date: Jan 2018 Drives: 2013 frs red Location: South Florida Posts: 3,517 Thanks: 2,520 Thanked 3,089 Times in 1,654 Posts Mentioned: 6 Post(s) Tagged: 1 Thread(s)	Both valves leaking quite a bit. Head has to come off. I would suspect valve springs as well given the circumstances of the failure Last edited by Lantanafrs2; 05-04-2020 at 08:12 AM.

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05-04-2020, 09:08 AM	#12
Lantanafrs2 Senior Member Join Date: Jan 2018 Drives: 2013 frs red Location: South Florida Posts: 3,517 Thanks: 2,520 Thanked 3,089 Times in 1,654 Posts Mentioned: 6 Post(s) Tagged: 1 Thread(s)	Valve springs generally fail at high rpm when they're under stress but a flawed or overworked spring can fail anytime regardless of rpm.

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