Noise while slowing to a stop - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

whatsinaname · 07-01-2014, 11:45 AM

I have been hearing this faint sound every time I slow to a halt. Sounds like some pump/fan spooling up and then stopping. Lasts for a few seconds. Any idea what it could be?

I will try to capture it on video/audio sometime today evening.

(2013 BRZ Limited)

Ernie L · 07-01-2014, 11:54 AM

Quote:

Originally Posted by whatsinaname

I have been hearing this faint sound every time I slow to a halt. Sounds like some pump/fan spooling up and then stopping. Lasts for a few seconds. Any idea what it could be?

I will try to capture it on video/audio sometime today evening.

(2013 BRZ Limited)

maybe
http://www.ft86club.com/forums/showthread.php?t=68912

wheelhaus · 07-01-2014, 12:35 PM

Are you putting it into first as you're slowing down with the clutch in? If so, what you're probably hearing is the faint whine of the gears as the synchros force the transmission input shaft up to a higher speed. (In 1st, the input shaft is at a shorter ratio to the output shaft, thus engaging 1st at a given speed requires a higher rpm).

Or in other words, it's normal, nothing to be concerned about.

whatsinaname · 07-02-2014, 11:31 AM

Quote:

Originally Posted by Ernie L

maybe
http://www.ft86club.com/forums/showthread.php?t=68912

Doesn't really sound like a fluttering sound.

Quote:

Originally Posted by wheelhaus

Are you putting it into first as you're slowing down with the clutch in? If so, what you're probably hearing is the faint whine of the gears as the synchros force the transmission input shaft up to a higher speed. (In 1st, the input shaft is at a shorter ratio to the output shaft, thus engaging 1st at a given speed requires a higher rpm).

Or in other words, it's normal, nothing to be concerned about.

I don't think it's that because it started fairly recently. Most times I don't even hear it because I have the radio going.

Maybe it is the A/C compressor running for a really short time? I wasn't running the A/C this morning and I heard nothing.

hobojoker · 07-02-2014, 11:41 AM

Does it sound like a chuttering/puffing sound sort of?

I've noticed when I have the AC on that when I come to a stop sometimes my revs drop to 500ish rpm, then flare up to 850ish before settling back down to a normal idle.

With the windows down and no radio on, it sounds strange.

strat61caster · 07-02-2014, 01:35 PM

Do you have a manual transmission? If so I'd guess flywheel/clutch rattle.

http://www.ft86club.com/forums/showp...0&postcount=20

ScionFR-S · 07-02-2014, 02:10 PM

Air condition fan turning on? Could be you hear it bc your slowing down. It goes on and off

Kuros · 07-02-2014, 02:47 PM

If manual - flywheel

If auto - an automatic transmission being an automatic

whatsinaname · 07-03-2014, 06:24 PM

Quote:

Originally Posted by ScionFR-S

Air condition fan turning on? Could be you hear it bc your slowing down. It goes on and off

I did some more testing and this is it. I think I didn't hear it before because I got the car in fall of last year and the last couple of weeks are the first time I have extensively used the A/C.

07-01-2014, 11:45 AM	#1
whatsinaname Member Join Date: Aug 2013 Drives: 1998 Ford ZX2 Location: Ann Arbor Posts: 67 Thanks: 0 Thanked 26 Times in 12 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Noise while slowing to a stop I have been hearing this faint sound every time I slow to a halt. Sounds like some pump/fan spooling up and then stopping. Lasts for a few seconds. Any idea what it could be? I will try to capture it on video/audio sometime today evening. (2013 BRZ Limited)

07-02-2014, 02:10 PM	#7
ScionFR-S Senior Member Join Date: Jul 2012 Drives: Raven Scion FR-S Location: Queens, NY Posts: 665 Thanks: 32 Thanked 79 Times in 55 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Air condition fan turning on? Could be you hear it bc your slowing down. It goes on and off __________________ "To make it in America you need three things, a smile, a gun, and a plan. If you need to give up one thing, give up the smile. If you need to give something else up, lose the gun. But never, ever, give up your plan."

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07-01-2014, 12:35 PM	#3
wheelhaus Join Date: Jul 2012 Drives: 2013 BRZ, 2020 KTM Super Duke 1290R Location: Denver Posts: 1,788 Thanks: 714 Thanked 1,141 Times in 624 Posts Mentioned: 49 Post(s) Tagged: 1 Thread(s)	Are you putting it into first as you're slowing down with the clutch in? If so, what you're probably hearing is the faint whine of the gears as the synchros force the transmission input shaft up to a higher speed. (In 1st, the input shaft is at a shorter ratio to the output shaft, thus engaging 1st at a given speed requires a higher rpm). Or in other words, it's normal, nothing to be concerned about.

07-02-2014, 11:41 AM	#5
hobojoker Senior Member Join Date: Feb 2013 Drives: SWP BRZ Limited Location: Ann Arbor, MI Posts: 138 Thanks: 39 Thanked 45 Times in 25 Posts Mentioned: 0 Post(s) Tagged: 1 Thread(s)	Does it sound like a chuttering/puffing sound sort of? I've noticed when I have the AC on that when I come to a stop sometimes my revs drop to 500ish rpm, then flare up to 850ish before settling back down to a normal idle. With the windows down and no radio on, it sounds strange.

07-02-2014, 02:47 PM	#8
Kuros Senior Member Join Date: May 2014 Drives: 2014 FRS Raven. 2011 sti red (gone) Location: United States Posts: 156 Thanks: 18 Thanked 40 Times in 28 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	If manual - flywheel If auto - an automatic transmission being an automatic

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