Fuel trims stuck at zero!
#17
Evolved Member
iTrader: (2)
Just an observation I had today. I reflashed my ECU and pulled the fuse to reset the trims. I idled for 20 minutes, no LTFT, I drove for 20 min, no ltft stopped at lights, idled again for 20, no ltft. SHut the car off for about an hour. Fired it up, no ltft after 5 minutes, drove another 20, no ltft, shut car off again for about 30 minutes, started up, no ltft, drove for about ten, idled again for about 5, and finally there was ltft. The whole time I had STFT and LTFT MID, no low. Fluke situation, but it happened when I reflashed the ecu, it was the same rom/maps I was already running, and have flashed several times in the last month, first time LTFT low has done this. So all I am saying is try to reflash again, and idle, try it several times. If it still doesn't read, you might have an ecu issue.
#18
Evolved Member
Thread Starter
Today I'll try a different ecu, also a JDM E7 & I'll be converting to a 9055 SD rom. I'm not sure if I'll have enough time to fine tune the injectors, idling & cruising, but I'll keep an eye on both LFTF & STFT & CL AFR in general.
#19
Evolved Member
iTrader: (4)
So let me get this correct, for verification.
While idling for 20 mins, you had STFT oscillating and the LFTF Low never changed?
While idling for 20 mins, you had STFT oscillating and the LFTF Low never changed?
Strange. What MAF Hz values do you get at idle?
#20
Evolved Member
Thread Starter
I swapped the ECU with an identical one, converted from a stock rom to a v7 SD rom, & now all the trims are working perfectly fine!
I'm going to calibrate the injectors a bit & then tune the car.
I'm going to calibrate the injectors a bit & then tune the car.
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