since your first injector slope setting is still in the tune, and now your ltft's are off and it's telling you that you need to go -5% on your slope, then that is in addition to the current setting...

so, for example, if your slope setting is already to -3%, and now you need to go another -5 ...

I had my LTFTs on my LS2 Corvette set at 1 before I installed a ported FAST 92 intake. I took a new log and now the LTFTs are about 5% off. This sound about right? It seems right to me, the LTFTs went up about 4% requiring a trim down of 5%, or pump more fuel into the injectors due to the improved ...

I am trying to adjust my tune based on the LTFT logs (2005 Corvete U7191). The LTFT Bank 1 reading is around 3.9% and the LTFT Bank 2 reading is 1.5 %.

I happen to have a narrow band AFR meter tapped into the drivers side O2 sensor. Some say that the resistance of the AFR affects the O2 sensor ...

no Neon.. our 7191's will show "original backup" under the last tune written screen when it's unlocked/restored...

to restore the original backup, you went to OPTIONS > TROUBLESHOOTING > RESTORE ORIGINAL BACKUP correct??

also, that error message for "Unable to read p/n of first calibration file ...

I can't remember where it says it exactly. I thought it was supposed to say that under the last tune written area.

Did you uninstall the tuner, or just install the original tune back to the vehicle?

I did not know you can "uninstall". I thought putting the original tune back in was the uninstall ...

The tuner should have said No Tune Installed/Tool Unlocked before updating the tool.

Where would such a message display? The message "Original Backup" I am getting is displayed under "Show Last Tune Written" under the "Options" menu.

Was I somehow supposed to clear that to arrive at the "No Tune ...

Quite sure I uninstalled the diablotune first. The tuner shows last tune written as Original Backup.

I also notice this is the message that displays when I turn on the tuner without hooking up to the obdII port

I am getting a similar mesage with my U7191 for my 2005 C6.

"Unable to read p/n of first calibration file". This is after I restored the factory tune onto the programmer, did the update CROM 9r02, and then tried to reload the Diablotune.

What was the final outcome for this problem?

Thanks got my car started. WHeewww - a close call!

But the Predator still cannot read the calibration file or my VIN.

I was upgrading to the new CROM v.9r02 and restored the factory tune in my 2005 Corvette - and now I cannot start the car.

Predator U7191

I am quite sure I reloaded the factory tune as the Predator said the restore was complete.

I tried to load the updated Diablotune and get "Unable to read p/n ...