High Afr readings. - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

ristar · 03-05-2017, 06:09 PM

Hello all, first time poster here. I'm seeing an interesting reading on my afr with oft. Stock 2013 fr-s with a drop in filter. I switched to running the oft stage 2 el e85 map about a month ago and I'm seeing the afr shoot up to 20:1 when I lift off the throttle. I don't have a data log handy, living out of a hotel and don't have the appropriate cable, I'll work on getting that if need be, but I'm wondering if a sensor might be at fault or something like, it happens in both closed and open loop fueling, and it seems to happen immediately, lift off throttle and it goes right up to 20 on the dot with no fluctuations, I don't hear or feel the engine running abnormal though. Thoughts?

elBarto · 03-05-2017, 06:17 PM

It's normal, when you lift of the throttle no fuel is being injected, only air. The sensor can only read at a maximum of 20:1

Apoc · 03-05-2017, 06:18 PM

completely normal. when you lift off the throttle, fuel cut off activates until the rpm returns to idle.

Trust86 · 03-05-2017, 06:19 PM

Check it at wot

ristar · 03-06-2017, 05:53 AM

OK that works for me, thanks all.
@Trust86 it seems ok at WOT, high 12 to very low 13. Not unreasonable I imagine

03-05-2017, 06:09 PM	#1
ristar Member Join Date: Mar 2017 Drives: 2013 FR-S Location: Atlanta GA Posts: 10 Thanks: 1 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	High Afr readings. Hello all, first time poster here. I'm seeing an interesting reading on my afr with oft. Stock 2013 fr-s with a drop in filter. I switched to running the oft stage 2 el e85 map about a month ago and I'm seeing the afr shoot up to 20:1 when I lift off the throttle. I don't have a data log handy, living out of a hotel and don't have the appropriate cable, I'll work on getting that if need be, but I'm wondering if a sensor might be at fault or something like, it happens in both closed and open loop fueling, and it seems to happen immediately, lift off throttle and it goes right up to 20 on the dot with no fluctuations, I don't hear or feel the engine running abnormal though. Thoughts?

03-05-2017, 06:18 PM	#3
Apoc Senior Member Join Date: Jul 2012 Drives: Raven FR-S 6M Location: Calgary, Canada Posts: 638 Thanks: 348 Thanked 375 Times in 232 Posts Mentioned: 3 Post(s) Tagged: 1 Thread(s)	completely normal. when you lift off the throttle, fuel cut off activates until the rpm returns to idle. __________________ “The World is Flat” [\|\|•]=(86)=[•\|\|]

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03-05-2017, 06:19 PM	#4
Trust86 Senior Member Join Date: Sep 2015 Drives: 2016 Halo FRS Location: US Posts: 414 Thanks: 290 Thanked 162 Times in 106 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	Check it at wot

03-06-2017, 05:53 AM	#5
ristar Member Join Date: Mar 2017 Drives: 2013 FR-S Location: Atlanta GA Posts: 10 Thanks: 1 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	OK that works for me, thanks all. @Trust86 it seems ok at WOT, high 12 to very low 13. Not unreasonable I imagine

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