Hondata

IF you are turning on auto tune it will make changes to the maps while enabled.


is there a toggle button for auto tune? in settings i can only see conditions it needs to activate;

''min throttle 5%, min lambda 11, max lambda 18. percentage change per cycle 55%, max change from base 10 ...

If it is in open loop, it will not alter the fuel automatically or make adjustments on its own.


is there anything you can see in my map that would cause this? i followed the instructions to wiring the aem gauge to the ecu via d10, ground at thermostat housing, resister cut...

ive also check ...

ive been getting an issue with the gauge since wiring it into the s300, when i try to adjust the fueling in openloop the aem gauge starts to sweep from rich 11.3 to the value i changed it too ie 11.3 -14 afr and it keeps sweeping until it settles back down to 11.3 afr again. once it does this its ...

Ok thats great thank you for your help.

Does the reading match without a voltage offset?


ok so after some googling and reading to the hondata help files...

the gauge is getting power from radio plug(turns on/off with key), as it was before i decided to connect to my hondata s300 v3.

ground is connected to the thermostat house, but ...

ok thanks ill go for the d10 pin

at the moment the wideband is conencted to the radio power with 10A fuse (so turns off when keys out) and ground is to the chassie/dashframe where the other dash wiring is gorund.

can i leave these as they are and connect the white output wire to d10 and be done ...

Spunkster wrote: Mon Oct 12, 2026 9:00 am Are you planning to run closed loop from the wideband input?

yes i want to run closed loop for targeting AFR when cruising around and idle for better fuel economy.

hi i need some help answering some questions about wiring my aem wideband 4.9 lsu to my s300 v3 ecu. The best way possible without making loads of changes to the boards components.

i know theres a few ways to do it -
d10, d12, d14, B6.

ideally id like the keep the function of the ELD, as my ek9 is ...

i got a reply back from rywire giving me instructions to install the cables into the ecu just as hondata instructed.
they didnt seem to give me an in depth explanation to why the a16 was missing, i asked if the altc fuction is not present on my wiring...
they just replied back with ''thats correct ...

having issues with the wiring going into the ecu,

instructions show the purple cable connecting to A16, my ecu plug does not have anything plugged here which makes me question where the ALTC cable is? do i have to remove this cable where ever it is before plugging in the purple cable to a16?

im ...

after monitoring the car withe the BKR8EIX, the car seems to run how it did before no issues. took it around the block and the power seems to be there no issues. im guessing the car did not like the BKR7EIX-11 for what ever reason???

i have taken a data log of the car starting up and idling with ...

the ones im currently running in the car are BKR7EIX-11 iridium i drove the car with these for a about 1 hour..

the following weekend the car developed the problems.

previously i was running BKR8EIX iridium and the 8's is what the car is tuned on.

would this be the issue? not sure if these are ...

ive been running the car on my new tune since july had a few track days all went perfect with the car... driving on the week ends spot on with no issues

recently the car started to miss fire around the low rpms and running very lean, around 2000rpm and up, af ratio was showing around 1.20/17.5 on ...

this issue has been resolved car is now running for the past 2-3 weeks,

issue was with the ignition coil in the distributor.

thanks for your support.

ok so i thought id keep this post updated in case anyone else runs into the same issue.

injectors tested and apparent didnt skip a beat with varied tests, here is a video of them being tested.

https://www.youtube.com/watch?v=0ld-xxVwkCM

seems the issue is on cylinder number 3 so i guess next ...