Originally Posted by
Philalbar1
1Project2Many, you were spot-on with your EGR suggestions. I fixed those two (which were both wrong) and the surging/jerking stopped right away, which left me with the same ol' issue. I bought myself a little power inverter today, so I could plug in my laptop in the truck, and set off early this afternoon logging data with the computer connected. It dodn't take me too long to notice something that didn't make sense to me. I noticed that the spark advance was staying up around 28-35* even when I let my foot off the accelerator, and didn't settle down until I came almost completely to a stop.
I opened up the search in TunerPro, and searced "speed", "idle", and "spark" just to have a look around. Long story short, I found that the spark advance table was releasing the spark advance back to 12* anywhere below 1200 or 1600 RPM while the truck was running, so I set the entire closed throttle table to 12. This made a good bit of difference! I also set the maximum speed for idle from 3 to 60 MPH, and changed some of the percentages of TPS to spark advance. PRESTO!!! I can shift with much quicker decel time between shifts, and she's even gurgling on engine braking like I was wanting. I've finally got her drivable again!!!
I think I can tune and tweak settings from here, but I wanted to let you know that between the EGR settings, and the timing map on closed throttle, I made some GREAT headway today! Thanks to everyone for all the help, and a special thanks to 1Project2Many for the patience and willingness to nudge me in the right direction throughout these issues. I can't tell you enough how appreciative I am. Truly a gentleman and a scholar! Thank you!
~Phil
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