I have an LB7 im tuning and while at an idle in gear I have a lope. I
didnt change any fuel pressure at idle or any pulse width. (So I
thought) I did some logging to find that at idle im demanding 4900psi
but was fluctuating from 52-4700psi. So, I went into my pulse width
chart and started lowering the values from the 5 mm3's all the way up
to 0 over to 40MPa. And I still had a lopey idle. So, I looked at the
scan tool, and moved the line around on the graph and noticed that it
was commanding 190MPa. Why is that? Is the CP3 getting weak and the
valve is opening all the way to keep pressure? So, I lowered those
values and it still lopes. But, load up the stock tune and all is
good. I have a tune in my truck that has way more fuel in the same
areas, and it idles smoothly. Im learning a lot but there is so much
more to go. Thanks in advance for any help