Transplanted a 2018 6.4 and 8 speed into a c body mopar. Using the stock computer, have a separate computer for the transmission. Have been trying for weeks reading, deleting and zeroing out all the dtc's and sensors which aren't there anymore. Have fuel pressure and the motor cranks, no spark. There has to be a way to have the stock computer run just the engine. Anyone have any tuning ideas or tuners to talk to?
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Yep, you are close, but you are missing an important feature. You have to tune the stock computer (ECM) to no longer need a canbus start signal, which is generated by a push button and RFHub module. You also need to remove SKIM security. The most cost effective way to do this is to have your stock ECM calibrated. https://www.diyhemi.com/product-page/2015-2021-crate-ecu-conversion