car - evo3, ecu - evo8, rom used - 96530706 tephra

did some idle loggings and none of the fuel trims has changed. also pulled P0135 code (front o2 heater)

thought the cel was affecting trims and disabled front o2 heater from periphery bit.14 setting it to 0, as early evos have unheated o2. also enabled rear o2 from bit.14 and disabled from the patch, setting it to 0x0009

did some more logging. no more cel but still no changes in fuel trims, all of them are frozen at 0.1008 %

below is the log of ~20 minutes of idle

any suggestions how to fix problem ?

 

..if i remember correctly i thought the o2 feedback was suppose to be before the fuel trim

 

fit a 4 wire o2 sensor log afr map also ,did you rescale the maf yet

 

maf rescaled and thats why I wanted to log trims to check if the maf is scaled correctly

 

stunt2 what is the airflow per rev showing? thats a way to tell if its scaled ok in the maf comp

if the fuel trims are stuck, reset the battery and let it idle for 4-6minutes. if the fuel trim low doesn't move, then just drive it
around for 30min or so until the trims move.. they will move eventually. 32-33hz airflow seems about right for your idle.

 

tscompusa Airflow/Rev is named Accel.enrichment in the log, right ?
it's between 32-34 and 37-43 to the end
or do you mean Air flow HZ ?

have you checked attached log in the first post ?