Originally Posted by
totalengine
I have a 2016 Scat Pack Charger here that we just installed a 426 in, and im having issues with the desired idle not commanding what the idle rpm is actually set to in the tune. In the tune (see attached) i have the idle set to 704 RPM in park and drive, which the car idles at perfectly, EXCEPT immediately after coming to a stop. In the attached log, you will see that as soon as i come to a stop, the desired idle goes to 550 RPM for a second or two, and then jumps back up to what its supposed to be, 704 RPM. As you can imagine, the car stumbles and almost dies during those couple seconds, but once the desired idle goes back up to 704 the car will idle perfectly. I cannot see anywhere in the tune where its telling the car to idle at 550 RPM at any time, Is there something i am missing? Does anyone have any ideas why it would desire an idle Rpm that is less than what is commanded in the tune for those couple seconds after coming to a stop?
What is even weirder is that it does not do it every time. If i come to a stop extremely slowly, the desired idle wont dip down to 550, and will stay at 704, but if i come to a stop at a normal rate to a fast rate, the desired idle will drop down to the 550 rpm for a couple seconds.