i've recently switched to another rom and have unplugged the ecu for 1 min and then reconnected
so this resets your fuel trims right?
i'm logging them but they are at 0.1008% all 3 ltft ! ?

are the fuel trims really good or something not logging right?

 

I have this same problem. I just logged mine last night for 35mins and not one fuel trim changed.

 

i forgot to add i did let it idle forever and had a long cruise too

 

Make sure you're not in full time open loop and your rear O2 is functioning properly. Also make sure your peripheries are correct.

 

our cars never had rear o2 to begin with so surely not need have the sim ?
where do i check open t closed loop settings?

 

Fuel tables...theres a few for throttle and a few for load. Sorry, didn't pay attention to the whole UK thing.

 

hows this?

 

Mine look like this...

 

unhook the battery and turn the starter over with battery unhooked to drain all juices and rehook up the battery and then take it for a 30min cruise on highway. the mid trim should move then. those are the default values before the ECU even begins to move the trims.

 

^ Hey....where have I heard that before? : )

 

Try logging trims using Mitsulogger instead of Evoscan.

 

.1008 is the default "zero"

Like others have mentioned above make sure your car is going closed-loop during idle and cruise. Let your car idle for 16 minutes (the trims cycle every 4 minutes) and see if the low trim moves at all.

 

i had the same problem when i installed bigger injectors,i tried to let the idle for 15-17 min then it worked and showed 3.5%,then i went for a cruise about 15-20 min the mid and high fuel trims never showed and gave same .1008 number,why this happens ?

 

injector scaling must be set in evoscan and you must reset the ecu and start from scratch if you want them to move the fastest. the mid trim should move after being 30min on cruise.. low trim should move in 6minutes of idling right after the battery was reset also.

 

if trim doesnt budge after 6minutes with LOW fuel trim and you have did what i said above with the battery and starter then you must go inside ecuflash and alter the CLOSED LOOP - LT FUEL TRIM CONTROL.. chances are the car is showing more HZ then what it normally does from factory so it will be stuck in open loop and low trim will never move.