Open Loop Injector Pulse Width calculation help

[mowton]

Working an engine swap 2009 Silverado project and have a general question as to the pcm inputs utilized to develop injector pulse widths in open loop Maf tune. Question is related to almost a 3ms difference (22 vs. 19ms) between Bank 1 and 2 injector pulse widths. Looking for a Bank related input sensor that cold drive the PCM to develop different pulse widths like above.

Thanks

Ed M

[DSteck]

Have you confirmed that there isn't an existing trim?

[mowton]

Have you confirmed that there isn't an existing trim?

No, I've always wondered if on a re-flash do the trims remain even from previous flashes? I have re-flashed several times in Open Loop with trims disabled. But a good place to look, thanks Dave.

That could only add to the fueling in PE correct?

Ed M

[mowton]

So after a weekend of googling and posting on other tuning site, I have found nothing other than Dave's suggestion on a lingering trim value and some vague statement about knock sensors. Will also recheck fuel pressure/volume and go back over my notes...... Will check these out this am and continue the struggle. Will try SD once again I guess just to have a plan going forward because right no I am stymied.

Ed M