Fk8 AFR hunting / oscillation

FK2 Civic Type R 2015-2017, FK8 Civic Type R 2017-2021, FL5 Civic Type R 2023+ and Integra Type S 2024+
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Hondata
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Re: Fk8 AFR hunting / oscillation

Post by Hondata »

If you post the datalogs from those screenshots I can analyze in the same way. What I am looking for is the AFM range to inj range to lambda range. Above they are all 4%. If you get something like 2% range on the AFM and 10% on the injector, then something is affecting the fueling. If AFM and INJ are the same then it is the AFM. If AFM and INJ are much less than the lambda then it is the o2 sensor, exhaust leak etc.
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Re: Fk8 AFR hunting / oscillation

Post by SpicyRat »

Hondata wrote: Tue Feb 15, 2022 7:58 pm If you post the datalogs from those screenshots I can analyze in the same way. What I am looking for is the AFM range to inj range to lambda range. Above they are all 4%. If you get something like 2% range on the AFM and 10% on the injector, then something is affecting the fueling. If AFM and INJ are the same then it is the AFM. If AFM and INJ are much less than the lambda then it is the o2 sensor, exhaust leak etc.
This is stock cal rescaled for PRLHVI with Race Maf.
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stock map hvirace maf 6th.fpdl
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Re: Fk8 AFR hunting / oscillation

Post by Hondata »

Only thing I see from the datalog is you are 5-7% rich and your vehicle is under more load than mine @ 80 mph.

My FK8 @ 80 mph : MAP 40-50 kPa, AFM 20 g/s

Yours @ 78 mph: MAP 70-90 kPa, AFM 40 g/s
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Re: Fk8 AFR hunting / oscillation

Post by SpicyRat »

Hondata wrote: Wed Feb 16, 2022 9:35 am Only thing I see from the datalog is you are 5-7% rich and your vehicle is under more load than mine @ 80 mph.

My FK8 @ 80 mph : MAP 40-50 kPa, AFM 20 g/s

Yours @ 78 mph: MAP 70-90 kPa, AFM 40 g/s
But does your AFR show as irratic as the datalog I uploaded? Keep in mind, thats a stock fk8 tune with racemaf scaling.
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Re: Fk8 AFR hunting / oscillation

Post by SpicyRat »

Hondata wrote: Wed Feb 16, 2022 9:35 am Only thing I see from the datalog is you are 5-7% rich and your vehicle is under more load than mine @ 80 mph.

My FK8 @ 80 mph : MAP 40-50 kPa, AFM 20 g/s

Yours @ 78 mph: MAP 70-90 kPa, AFM 40 g/s
These are from today: hondata 93 downpipe basemap with HVIRACEMAF cal. Closer to yours. I'd imagine more vac a few mph higher.
what do you think?
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Hondata_93oct_basemap 2-16-22.fpcal
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hondata basemap cruise part 2 HVI 2-16-22.jpg
hondata basemap cruise part 2 HVI 2-16-22.jpg (263.36 KiB) Viewed 1339 times
hondata basemap cruise HVI 2-16-22.jpg
hondata basemap cruise HVI 2-16-22.jpg (246.64 KiB) Viewed 1339 times
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Re: Fk8 AFR hunting / oscillation

Post by SpicyRat »

Hondata wrote: Wed Feb 16, 2022 9:35 am Only thing I see from the datalog is you are 5-7% rich and your vehicle is under more load than mine @ 80 mph.

My FK8 @ 80 mph : MAP 40-50 kPa, AFM 20 g/s

Yours @ 78 mph: MAP 70-90 kPa, AFM 40 g/s
🙋‍♂️
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Re: Fk8 AFR hunting / oscillation

Post by SpicyRat »

Hondata wrote: Wed Feb 16, 2022 9:35 am Only thing I see from the datalog is you are 5-7% rich and your vehicle is under more load than mine @ 80 mph.

My FK8 @ 80 mph : MAP 40-50 kPa, AFM 20 g/s

Yours @ 78 mph: MAP 70-90 kPa, AFM 40 g/s
Replaced OEM factory MAF with a new unit, zero change.
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Re: Fk8 AFR hunting / oscillation

Post by SpicyRat »

Update, driving with the factory o2 unplugged 100% gets rid of the hesitation while cruising, the mileage indicator on the dash display stays still at cruise, and the idle was smoother and more stable than its ever been (no cough or slight difference in air flow at idle). stayed out of boost obviously, but the overall "basic drive" was 100% improved by unplugging the brand new factory o2 sensor.

So, it would appear there is a setting in the hondata, an electrical issue in the car itself, or an issue with my actual ECU (which was manually jailbroken by KTUNER before switching to hondata this year). Car is basically stock, no stereo upgrades, no wiring things added of any kind, so I doubt that my car is the 1 out of hundreds of thousands with an 02 wiring issue.

Any input from Hondata would be great...........
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Re: Fk8 AFR hunting / oscillation

Post by Hondata »

I do not believe it is a software related problem.
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Re: Fk8 AFR hunting / oscillation

Post by SpicyRat »

Here is the data log from today. all of the issues of before were cured by unplugging the primary o2 (which is brand new from honda). This is still on the Hondata basemap with HVIRACEMAF cal.

By taking out a critical part of the car's operation and performance (primary o2) in the closed loop/tuning side, the issues around cruising hesitation, air and fuel fluctuation to the point where it causes lagging or stuttering, small putts and puffs with wandering Idle, the factory mileage indicator constantly going up and down while holding a steady throttle, etc. were all resolved entirely. How is that not a software or ecu hardware issue?

Unplugging the O2 didn't solve a vac leak, restore poor compression, or fix a faulty injector, but it did make all the issues in closed loop feedback disappear. Which leads o 1. is the Hardware in the ECU damaged? 2. Is there a problem with the flashpro or cal? 3. there is a 1 of a kind wiring anomaly in this 1 '18 Type-R.
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Re: Fk8 AFR hunting / oscillation

Post by Hondata »

By unplugging the o2 you are forcing the ECU into open loop, which masks any other problem. It's like cutting off you leg and saying your toe no longer hurts.

The ECU and FlashPro and FlashProManager are all deterministic from a software point of view. You can take any ECU and any FlashPro and if you upload the same calibration you will get exactly the same behavior from the ECU. So I am sure it is not a software issue.
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Re: Fk8 AFR hunting / oscillation

Post by SpicyRat »

I can see that point, but if the issue was mechanical and didn't care about open or closed loop (bad injector, AFM broken, etc.) Running in open loop would have had zero effect. But it had all the effect.

Further, the secondary O2 was reading stable voltage today for the first time ever. It always fluctuated with the primary to a degree.

So again, closed loop or not, why would that and all symptoms stabilize if it wasn't wiring or ECU/hondata based?
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Re: Fk8 AFR hunting / oscillation

Post by SpicyRat »

Checked for wiring issue by checking for continuity between LAF plug and ECU Pin.

ECU Pin 59 = LAF #5 Brown
ECU Pin 5 = LAF #3 Brown
ECU Pin 83 = LAF #1 Green
ECU Pin 60 = LAF #6 Blue
ECU Pin 96 = LAF #4 Light Blue (32ohms of resistance)
ECU Pin 84 = LAF #2 Grey

All pins from the LAF vehicle side of the connector to the pin in the ECU all check out except for a weird 32ohm 96/#4 wire that wouldn't beep-out, but showed resistance.
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Re: Fk8 AFR hunting / oscillation

Post by SpicyRat »

No wires from the LAF or from the corresponding Pins on the ECU ground out either.
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Re: Fk8 AFR hunting / oscillation

Post by SpicyRat »

All wires except for the one noted show .4 ohms from the wideband connector to the ecu pin.
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