2014 weird RPM behavior when braking (Automatic) - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

kev0 · 07-13-2019, 03:16 AM

https://streamable.com/qg8a8

Does anyone else's AT behave like this? Mine never did this when on OFT OTS tune. Only started acting like this when tuned with Ecutek and SC install.

When coming to a stop, my RPM's will dip to ~490 then instantly shoot back up to ~730 a second later. When it dips, my car will shake a bit until it shoots back up. It even gets to the point where my oil light will flicker. I've checked my oil every time I come home and it's at the correct amount;even went to get it changed to 5w-30 yesterday and it still happens.

In the last second of the video, you can see what I'm talking about. Is this something that a tuner can smooth out or is it not possible? I've talked to my tuner about it and he keeps adjusting the tune but it's still persistent. It ONLY happens when I'm braking. RPM is normal and doesn't fluctuate when in park.

ftpwny · 07-13-2019, 04:15 PM

This happens to me as well with my 2013 6AT on OFT stage 2 catted tune and the Wayno tunes.

It only happens under hard braking and i can reproduce it pretty easily. There have been 2-3 times I actually had to brake hard and have actually had the engine stall completely. Super annoying.

Sent from my Pixel 3 XL using Tapatalk

86TOYO2k17 · 07-13-2019, 06:21 PM

Not Normal. Did you get all your leaks sorted out and your LTFT and STFT sorted? They should not be a combined value of more then +\- 10% otherwise either MAF needs scaling, or most likely you still have leaks. Which would correlate to RPM drop

Lantanafrs2 · 07-13-2019, 08:33 PM

Vacuum issue?

steve99 · 07-14-2019, 06:32 AM

Alter the overun fuel resume table to resume fuling a a slighly higher rpm.

Adc 50 rpm to base ilde tables as well

ftpwny · 11-01-2019, 01:21 PM

closing the loop on this. I cleaned my throttle body with CRC throttle body cleaner and that resolved my issues. Might be worth trying if you're still running into this.

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Leonardo · 11-01-2019, 01:22 PM

I have a bone stock 2013 AT, I have had this happen too.

x808drifter · 11-01-2019, 02:17 PM

My car did it stock and after tune. I know mine does this when the AC compressor kicks on.

Is that what's happening to yours?

07-13-2019, 03:16 AM	#1
kev0 Senior Member Join Date: Feb 2018 Drives: '14 Location: Midwest Posts: 485 Thanks: 246 Thanked 99 Times in 76 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	2014 weird RPM behavior when braking (Automatic) https://streamable.com/qg8a8 Does anyone else's AT behave like this? Mine never did this when on OFT OTS tune. Only started acting like this when tuned with Ecutek and SC install. When coming to a stop, my RPM's will dip to ~490 then instantly shoot back up to ~730 a second later. When it dips, my car will shake a bit until it shoots back up. It even gets to the point where my oil light will flicker. I've checked my oil every time I come home and it's at the correct amount;even went to get it changed to 5w-30 yesterday and it still happens. In the last second of the video, you can see what I'm talking about. Is this something that a tuner can smooth out or is it not possible? I've talked to my tuner about it and he keeps adjusting the tune but it's still persistent. It ONLY happens when I'm braking. RPM is normal and doesn't fluctuate when in park.

11-01-2019, 01:22 PM	#7
Leonardo Country Boy 4 Life Join Date: Jul 2012 Drives: 19' & 06' Ridgelines, 13' FR-S Location: EUGENE Posts: 5,228 Thanks: 6,719 Thanked 5,291 Times in 2,720 Posts Mentioned: 47 Post(s) Tagged: 1 Thread(s)	I have a bone stock 2013 AT, I have had this happen too. __________________ I LIKE TIRES!

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07-13-2019, 04:15 PM	#2
ftpwny Member Join Date: Aug 2018 Drives: 2013 Subaru BRZ Location: Portland, OR Posts: 13 Thanks: 0 Thanked 3 Times in 3 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	This happens to me as well with my 2013 6AT on OFT stage 2 catted tune and the Wayno tunes. It only happens under hard braking and i can reproduce it pretty easily. There have been 2-3 times I actually had to brake hard and have actually had the engine stall completely. Super annoying. Sent from my Pixel 3 XL using Tapatalk

07-13-2019, 06:21 PM	#3
86TOYO2k17 Senior Member Join Date: Jan 2018 Drives: 2017 toyota 86 Location: PNW Posts: 2,131 Thanks: 336 Thanked 1,188 Times in 781 Posts Mentioned: 16 Post(s) Tagged: 0 Thread(s)	Not Normal. Did you get all your leaks sorted out and your LTFT and STFT sorted? They should not be a combined value of more then +\- 10% otherwise either MAF needs scaling, or most likely you still have leaks. Which would correlate to RPM drop

07-13-2019, 08:33 PM	#4
Lantanafrs2 Senior Member Join Date: Jan 2018 Drives: 2013 frs red Location: South Florida Posts: 3,517 Thanks: 2,520 Thanked 3,088 Times in 1,654 Posts Mentioned: 6 Post(s) Tagged: 1 Thread(s)	Vacuum issue?

07-14-2019, 06:32 AM	#5
steve99 Banned Join Date: Dec 2013 Drives: FT86 Location: Australia Posts: 7,998 Thanks: 1,035 Thanked 4,987 Times in 2,981 Posts Mentioned: 598 Post(s) Tagged: 2 Thread(s)	Alter the overun fuel resume table to resume fuling a a slighly higher rpm. Adc 50 rpm to base ilde tables as well

11-01-2019, 01:21 PM	#6
ftpwny Member Join Date: Aug 2018 Drives: 2013 Subaru BRZ Location: Portland, OR Posts: 13 Thanks: 0 Thanked 3 Times in 3 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	closing the loop on this. I cleaned my throttle body with CRC throttle body cleaner and that resolved my issues. Might be worth trying if you're still running into this. Sent from my Pixel 3 XL using Tapatalk

11-01-2019, 02:17 PM	#8
x808drifter LMGTFY Join Date: Mar 2016 Drives: 13 FRS, 91 Miata Location: Lava Town, HI Posts: 2,776 Thanks: 5,561 Thanked 3,646 Times in 1,625 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	My car did it stock and after tune. I know mine does this when the AC compressor kicks on. Is that what's happening to yours?

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