dfco not working? rpm drop at stops (intermittent)
Greetings
I've had my Go Street 400 for about a year and a half. I installed it when I rebuilt my engine. One of the issues I've always had is a low rpm drop or stumble when coming to a stop usually after a long coast, especially down hill. I've tried to tackle this issue on and off with no luck.
From what I can tell my AFR goes rich (12 sometimes lower) during a long coast which causes the system to take out too much fuel resulting in a lean condition that nearly stalls the engine when coming to a stop. But, I could be wrong...
I recently wondered if my issue is with the DFCO. It seems to me this feature should be preventing the issue I just described... "reduce fueling to prevent popping and an over-rich condition" . However, the only time I recall seeing dfco be triggered is when decelerating from high way speeds, which I rarely do. Looking at the "AFR" and "Fuel PW" PID on the handle afr would go to 20 and fuel pw would go 0. This never happens at in-town speeds.
I found another post that suggest dfco won't be triggered if engine RPMs don't exceed 2300. If that's true... is there anyway to change it?
I've messed with dfco settings in the past but, they never seemed to make a difference. So, I left them alone after reloading the default cal file.
Vehicle information
3/4 ton pickup 4x4
small block Chrysler V8 5.9L LA (other than a towing cam and intake pretty much stock)
dual plane intake manifold (Weiand 8022WND)
3 speed automatic transmission, full time transfer case
fine drive ratio = 4.10:1