ECU not Logging STFT/LTFT Anymore

[Lil John]

I have a 98 GSX. The problem is that a battery charger was hooked up backwards and turned on 250amps for starting. Ya, messed up, i know.

Anyways, now the ecu won't log my fuel trims which it did before the incident. Both are zero and don't move. And also I get a P0300 random misfire constantly. As soon as you clear it, it comes right back. It didn't have this before either. I have another ecu on the way.

I reset my idle and my timing which are now perfect. I car seems idle ok. I just cant do any tuning since i have no fuel trim info. My guess is something in the ecu. Any other ideas, thanks.

 

[twdorris]

Post a log and let's see what you've got.

This page lists some of the conditions that are required for fuel trims to update. I'm sure one or more of these are simply not being satisfied. The question would be why, but maybe a log will answer that better.

fueltrimupdatepoints [ECMTuning - wiki]

Thomas Dorris

 

[jeffo]

Have you tried simply unplugging the ECU to reset it? You may have corrupted the memory, and it just needs a fresh reboot.