Air flow escaping at EGR Cooler connection to ex. Manifold

[wrench buster]

(08-19-2025 )tree98 Wrote:  The ECM commands all kinds of different pressure through the EGR circuit to the intake. You have no way of knowing how much is to much at any given time. I think your chasing your tale and following a rabbit hole with no end.

You said you have a code for high DPF differential pressure so start there. When is the last time the DPF was baked? What does aftertreatment history look like when connected with insite?

Thanks for your input Tree, come to find out the DOC was Not cleaned, and there are signs of excessive soot entering it. I believe I'm getting close to the root problem. Excessive fuel and or inadequate air entering the engine.