Engine shaking/vibrations at 1700rpm - when in neutral/idle - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

kharn83 · 08-19-2012, 09:42 PM

Hi Guys,

Just noticed something with my 86 manual, at idle and in neutral, when I rev my engine to about 1700rpm, the engine and the car starts shaking a bit, i.e. like its timing is a bit off or something like that, almost like the engine is missing or something?

Reving thru every other part of the rev range its very smooth, but if i rev thru 1700rpm or keep it around there it shakes/stumbles kind of - Is it just me?

If not, is this a normal thing and what might it be explained by?

Cheers

whtchocla7e · 08-19-2012, 09:54 PM

Natural frequency?

kharn83 · 08-20-2012, 08:47 PM

Hmm sounds like it is a known issue - some people have it others don't - anyone else tried to see if it occurs or not?

Cheers

Sent from my GT-I9100 using Tapatalk 2

rx3 · 07-01-2013, 01:09 PM

Mine does that too.

topazsparrow · 07-01-2013, 02:45 PM

Checking in. The entire car shakes (might be a strong word) at this RPM.

coincidentally this is also where the engine is noisiest if you're loading the engine in second gear at slow speeds. It sounds quite rattly.

hanabie · 07-01-2013, 03:13 PM

oh lol.. I thought my driving skill was so mediocre that created that sort of noises.

stueck9356 · 11-07-2013, 08:10 PM

Necro posting here, but mine does the same thing. Brand new 2014, 12 days old with 300 miles on it. Probably normal. Feels like a slightly off balance washing machine load. Kinda sounds like it too. Solution? Just don't hold 1700 in neutral.

RandomHero · 11-07-2013, 08:48 PM

Quote:

Originally Posted by whtchocla7e

Natural frequency?

+1 stay out of that rpm range as much as you can. Its the natural resonant frequency of your engine more than likely.
Take for example a Garret turbine engine - has a resonant frequency at around 20% RPM which I think is around 7200-10000RPM so you have to kill the engine if it sits in that rpm range for more than 10secs

stevemp5 · 11-07-2013, 09:42 PM

Same thing here!! I think is normal..

Wo6M · 11-07-2013, 10:00 PM

Once the transmission brakes in , the low RPM rattles will almost disappear . For me me , 3000 miles or so I noticed this ... My 2cents

08-19-2012, 09:42 PM	#1
kharn83 Member Join Date: May 2012 Drives: S15 Silvia Location: Australia Posts: 65 Thanks: 20 Thanked 4 Times in 4 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Engine shaking/vibrations at 1700rpm - when in neutral/idle Hi Guys, Just noticed something with my 86 manual, at idle and in neutral, when I rev my engine to about 1700rpm, the engine and the car starts shaking a bit, i.e. like its timing is a bit off or something like that, almost like the engine is missing or something? Reving thru every other part of the rev range its very smooth, but if i rev thru 1700rpm or keep it around there it shakes/stumbles kind of - Is it just me? If not, is this a normal thing and what might it be explained by? Cheers

08-19-2012, 09:54 PM	#2
whtchocla7e Senior Member Join Date: May 2012 Drives: 2013 FR-S Hot Lava Location: CT Posts: 424 Thanks: 30 Thanked 222 Times in 81 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Natural frequency? __________________ Live to drive another day

11-07-2013, 10:00 PM	#10
Wo6M Keep Calm And Drift On~ Join Date: May 2013 Drives: Scion FR-S WhiteOut 6 Speed Manual Location: Boca Raton ,FL Posts: 268 Thanks: 202 Thanked 114 Times in 61 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	Once the transmission brakes in , the low RPM rattles will almost disappear . For me me , 3000 miles or so I noticed this ... My 2cents __________________ 2013 Scion FR-S White Out Six Speed Manual Name: Deava Mods:

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08-20-2012, 08:47 PM	#3
kharn83 Member Join Date: May 2012 Drives: S15 Silvia Location: Australia Posts: 65 Thanks: 20 Thanked 4 Times in 4 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Hmm sounds like it is a known issue - some people have it others don't - anyone else tried to see if it occurs or not? Cheers Sent from my GT-I9100 using Tapatalk 2

07-01-2013, 01:09 PM	#4
rx3 Senior Member Join Date: Mar 2013 Drives: BRZ Location: Europe Posts: 350 Thanks: 53 Thanked 114 Times in 71 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Mine does that too.

07-01-2013, 02:45 PM	#5
topazsparrow Senior Member Join Date: Jul 2012 Drives: slow Location: Canada Posts: 293 Thanks: 87 Thanked 158 Times in 61 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Checking in. The entire car shakes (might be a strong word) at this RPM. coincidentally this is also where the engine is noisiest if you're loading the engine in second gear at slow speeds. It sounds quite rattly.

07-01-2013, 03:13 PM	#6
hanabie Senior Member Join Date: Feb 2012 Drives: WRB LMTD '13 Location: Phillips Ranch Posts: 1,246 Thanks: 184 Thanked 242 Times in 158 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	oh lol.. I thought my driving skill was so mediocre that created that sort of noises.

11-07-2013, 08:10 PM	#7
stueck9356 Member Join Date: Oct 2013 Drives: 2015 VW GTI SE Location: Charlotte, NC Posts: 71 Thanks: 6 Thanked 11 Times in 9 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Necro posting here, but mine does the same thing. Brand new 2014, 12 days old with 300 miles on it. Probably normal. Feels like a slightly off balance washing machine load. Kinda sounds like it too. Solution? Just don't hold 1700 in neutral.

11-07-2013, 09:42 PM	#9
stevemp5 Senior Member Join Date: Jan 2013 Drives: scion fr-s Location: montreal Posts: 217 Thanks: 89 Thanked 148 Times in 77 Posts Mentioned: 4 Post(s) Tagged: 1 Thread(s)	Same thing here!! I think is normal..

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