Originally Posted by dieselkane
Commanded EGR % is the one you want to watch.
That's the one!
My valve hasn't been functional in over a year, so I couldn't remember what the parameter was.
Originally Posted by sjl2725
OK. Thanks guys... Not sure why I never used that one... So "commanded" will mean "setpoint" or what the computer is asking the valve to open to, correct? So that makes me wonder what the valve is actually opening closing to. If the control says "go to 45% open", can I see the feedback saying "ok, I'm at 45%"?
I should just block the dang thing off and be done with it, eh?
The Commanded EGR parameter is going to show you exactly what the valve is doing using a 0% to 100% basis, with 0% being closed and 100% being fully open. You won't, and shouldn't see the valve cycle with the 250 tune unless the truck is idling. The 210 tune is the same way. The 175 and lower tunes will cycle it all the time. The 275, 310 (and 300), and the 350 tunes will never cycle the valve, even at idle you won't see it cycle.