Engine Acceleration Noise - Page 4 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

C4RBON · 04-28-2017, 08:40 PM

I was planning on chiming in here again, as I've made some discoveries regarding my issue in the last 6 months. It turns out, I have two noises that are similar, and sometimes happen independently, sometimes concurrently. There is also intake inductance resonance around 4000 rpm which makes the sources harder to identify.

One of the noises is in fact the clutch spring. The other noise is in the reverse lockout collar mechanism.

The clutch spring noise is louder, more metallic, and definitely sounds like it is in front of you. This goes away with a light press of the clutch pedal.

The reverse lockout noise isn't as loud and persistent. It sounds like it is coming from behind the center console, but after you identify it, it is definitely coming from the shifter area. Pulling up on the reverse lockout collar on the shifter changes the pitch to be much higher.

My car has been tracked twice now since I posted last, and nothing blew up. My oil analyses don't indicate any serious problems. I have stopped worrying about this (finally).

Ultramaroon · 04-28-2017, 09:33 PM

The reverse lockout noise is the cable rattling inside the shifter lever, which is hollow. I've considered stuffing some spongy shit in there. But meh.

MotoGrapher · 04-30-2017, 08:22 PM

Quote:

Originally Posted by Ultramaroon

You'll just check it the next time it happens. Don't hold your breath though. I think I'm out to lunch here.

I confirmed that it was the cold air intake. I have an Injen cold air intake but somehow it started to rattle at certain RPM...

Ultramaroon · 04-30-2017, 09:13 PM

Quote:

Originally Posted by MotoGrapher

I confirmed that it was the cold air intake. I have an Injen cold air intake but somehow it started to rattle at certain RPM...

Nice. So many potential sources for rattle...

At the end of driving all day yesterday after 9 months of silence my old friend the clutch spring decided to get chatty. Quick tap and it shut up.

mjfulk · 09-13-2017, 11:21 AM

Sorry to leave a comment on such an old thread but this is the exact problem/noise I've been experiencing for the last several months and the reason I joined this forum. rburrow87 did you, or anyone else for that matter, find out what the cause was? Mine has been getting progressively worse but not consistent enough to have a shop diagnose yet. I have a gut feeling it's related to the fuel system. When I flashed to the OFT e 85 tune for a few tanks the noise was present more often. I'm getting really frustrated and hoping to find out the cause, and if neccisary, a fix. I'd appreciate any input people might have.

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strat61caster · 09-13-2017, 01:18 PM

Quote:

Originally Posted by mjfulk

When I flashed to the OFT e 85 tune for a few tanks the noise was present more often. I'm getting really frustrated and hoping to find out the cause, and if neccisary, a fix. I'd appreciate any input people might have.

Many aftermarket tunes including OFT create a noise that may be what you're experiencing.

http://www.ft86club.com/forums/showthread.php?t=59475

Ultramaroon · 09-13-2017, 01:30 PM

Quote:

Originally Posted by mjfulk

Sorry to leave a comment on such an old thread but this is the exact problem/noise I've been experiencing for the last several months and the reason I joined this forum.

Welcome, and no worries. You're doing it right.

Can you post up a decent clip of the sound? It can be a real challenge.

mjfulk · 09-14-2017, 10:14 AM

Quote:

Originally Posted by Ultramaroon

Welcome, and no worries. You're doing it right.

Can you post up a decent clip of the sound? It can be a real challenge.

Thanks for the reply's. The sound is actually getting to the point I was able to replicate it while reving in neutral this morning. Here is a video. Not the best quality but the sound does come through on it

https://www.google.com/url?sa=t&sour...jtvfnGP_UlkifA

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mjfulk · 09-14-2017, 10:19 AM

One more time on the video link

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Ultramaroon · 09-14-2017, 06:11 PM

Quote:

Originally Posted by mjfulk

One more time on the video link

Sent from my HTC6545LVW using Tapatalk

I'm going to guess it's the engine bottom cover. Try laying down and tapping on it from underneath. If not that, then pesky clutch spring.

04-28-2017, 09:33 PM	#44
Ultramaroon 義理チョコ Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 31,867 Thanks: 52,128 Thanked 36,519 Times in 18,920 Posts Mentioned: 1106 Post(s) Tagged: 9 Thread(s)	The reverse lockout noise is the cable rattling inside the shifter lever, which is hollow. I've considered stuffing some spongy shit in there. But meh. __________________ service manuals

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04-28-2017, 08:40 PM	#43
C4RBON Senior Member Join Date: Mar 2011 Drives: '15 BRZ, '19 GTI Location: USA/Iowa Posts: 204 Thanks: 77 Thanked 163 Times in 79 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	I was planning on chiming in here again, as I've made some discoveries regarding my issue in the last 6 months. It turns out, I have two noises that are similar, and sometimes happen independently, sometimes concurrently. There is also intake inductance resonance around 4000 rpm which makes the sources harder to identify. One of the noises is in fact the clutch spring. The other noise is in the reverse lockout collar mechanism. The clutch spring noise is louder, more metallic, and definitely sounds like it is in front of you. This goes away with a light press of the clutch pedal. The reverse lockout noise isn't as loud and persistent. It sounds like it is coming from behind the center console, but after you identify it, it is definitely coming from the shifter area. Pulling up on the reverse lockout collar on the shifter changes the pitch to be much higher. My car has been tracked twice now since I posted last, and nothing blew up. My oil analyses don't indicate any serious problems. I have stopped worrying about this (finally).

09-13-2017, 11:21 AM	#47
mjfulk Member Join Date: Aug 2017 Drives: 2014 FR-S Location: Cheyenne Wy Posts: 13 Thanks: 0 Thanked 4 Times in 3 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Sorry to leave a comment on such an old thread but this is the exact problem/noise I've been experiencing for the last several months and the reason I joined this forum. rburrow87 did you, or anyone else for that matter, find out what the cause was? Mine has been getting progressively worse but not consistent enough to have a shop diagnose yet. I have a gut feeling it's related to the fuel system. When I flashed to the OFT e 85 tune for a few tanks the noise was present more often. I'm getting really frustrated and hoping to find out the cause, and if neccisary, a fix. I'd appreciate any input people might have. Sent from my HTC6545LVW using Tapatalk

09-14-2017, 10:19 AM	#51
mjfulk Member Join Date: Aug 2017 Drives: 2014 FR-S Location: Cheyenne Wy Posts: 13 Thanks: 0 Thanked 4 Times in 3 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	One more time on the video link Sent from my HTC6545LVW using Tapatalk

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