Idle Misfire/Stumble - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Nightbringer · 09-18-2013, 06:02 PM

Quote:

Originally Posted by lychee

Is your a/c on during cold start up? If so, turn it off.

AC is not on and I prime the pump for 5 seconds before turning it over, etc. This isn't the usual idle stumble everyone complains about. I had that previously. This is MUCH more drastic. LTFT's on stock map are now +40% across the board.

feldy · 09-18-2013, 06:32 PM

What does the short term trims look like?

Nightbringer · 09-18-2013, 07:19 PM

They max out when the LTFT's reset of course, otherwise if the LTFT's are staying at 40%, the STFT's range from -5 to +5, so normal. Trying to see if I've got injector duty cycle in these logs...

feldy · 09-18-2013, 10:42 PM

I have been seeing -14 to +14 sometimes other times -10 to +10 I need to get that looked at. Short trims my long trims are disabled currently.

Nightbringer · 09-18-2013, 11:19 PM

Honestly that doesn't sound all that bad to me. I'm a novice, so mad_sb or one of the other pros would have to give further thought, but if that's the total variance... if you had LTFT's enabled that'd be like a +10 constant LTFT, and +/- 4 for STFT. Not perfect but that seems pretty decent compared to some of the crap I've seen. LTFT's turned off to narrow in maf scaling or something?

whitefrs · 09-18-2013, 11:24 PM

boosted FRS here on e85

Short trims are -3 to 3
and
Long are 13.3

feldy · 09-19-2013, 12:27 AM

No tony has them off to keep the ltfts from stacking up and from giving the stock ecu issues when going wot and adding extra fuel. I autocross all year long and this year I was switching from 93 to e85 every few weeks.

Quote:

Originally Posted by Nightbringer

Honestly that doesn't sound all that bad to me. I'm a novice, so mad_sb or one of the other pros would have to give further thought, but if that's the total variance... if you had LTFT's enabled that'd be like a +10 constant LTFT, and +/- 4 for STFT. Not perfect but that seems pretty decent compared to some of the crap I've seen. LTFT's turned off to narrow in maf scaling or something?

09-18-2013, 06:32 PM	#16
feldy Senior Member Join Date: Aug 2011 Drives: 2013 FRS Asphalt Location: SF Bay Area Posts: 1,155 Thanks: 309 Thanked 335 Times in 212 Posts Mentioned: 21 Post(s) Tagged: 0 Thread(s)	What does the short term trims look like? __________________ 2013 Scion FR-S AT Picked up 5/30/2012

09-18-2013, 10:42 PM	#18
feldy Senior Member Join Date: Aug 2011 Drives: 2013 FRS Asphalt Location: SF Bay Area Posts: 1,155 Thanks: 309 Thanked 335 Times in 212 Posts Mentioned: 21 Post(s) Tagged: 0 Thread(s)	I have been seeing -14 to +14 sometimes other times -10 to +10 I need to get that looked at. Short trims my long trims are disabled currently. __________________ 2013 Scion FR-S AT Picked up 5/30/2012

09-18-2013, 11:24 PM	#20
whitefrs Love Boost!!!!!!!! Join Date: Jun 2012 Drives: Whiteout Scion FR-S Location: Long Island NY Posts: 3,612 Thanks: 429 Thanked 902 Times in 606 Posts Mentioned: 87 Post(s) Tagged: 3 Thread(s)	boosted FRS here on e85 Short trims are -3 to 3 and Long are 13.3 __________________ ༼ つ ◕_◕ ༽つ I LOVE BOOST ༼ つ ◕_◕ ༽つ

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09-18-2013, 07:19 PM	#17
Nightbringer Senior Member Join Date: Apr 2013 Drives: Scion FR-S Location: Nowhere Posts: 346 Thanks: 175 Thanked 211 Times in 120 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	They max out when the LTFT's reset of course, otherwise if the LTFT's are staying at 40%, the STFT's range from -5 to +5, so normal. Trying to see if I've got injector duty cycle in these logs...

09-18-2013, 11:19 PM	#19
Nightbringer Senior Member Join Date: Apr 2013 Drives: Scion FR-S Location: Nowhere Posts: 346 Thanks: 175 Thanked 211 Times in 120 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Honestly that doesn't sound all that bad to me. I'm a novice, so mad_sb or one of the other pros would have to give further thought, but if that's the total variance... if you had LTFT's enabled that'd be like a +10 constant LTFT, and +/- 4 for STFT. Not perfect but that seems pretty decent compared to some of the crap I've seen. LTFT's turned off to narrow in maf scaling or something?

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