I just installed a 4" stright exhaust this past weekend from the down pipe back... I used my SCT tuner and programed a simple "street" tune with
DPF deleted, EGTs ON, No new tires, and NO EGR mod.
She's idling around 950-970!
I've read above and even hooked up the rear (3rd) "secondary EGT" sensor, used the monitor function in the programmer and observed the EGT sensor display current temps. The MAIN EGT must be up on the manifold or something.
Why would this solution work since when you select "deleted DPF" I'm assuming the tuner will program the truck NOT to use any of the three "secondary DPF" sensors?
Short of ordering a custom tune I don't know what to do. The truck ran fine with the different tunes before the exhaust mod. I have no CELs and she runs fine... just idles too high!!