X15 2450 low power high fuel consumption

[Will144]

(11-20-2023 )windowrattler Wrote:  You could check for boost leaks, egr differential pressure sensor tubes and exhaust pressure sensor tube. We had a school bus recently that a boost leak and egr diff press sensor tubes was messing with readings. The ecm would slowly keep on opening the egr till it would get to 100%. Fixing the boost leak made it slower to climb to 100% but the mostly clogged egr dps tube cleared out the issue all the way.

For egr from what I know the ecm is after a certain amount of egr flow. It calculates how much flow is happening and if less than it wants it opens the egr valve more. It will open it until it gets to it's commanded flow rate.

Yes, I have cleaned the dps tube and replaced the sensor. Also replaced exhaust pressure sensor and cleaned housing and tube. Soaped the cac and pressurized it. I know I'm overlooking or missing something just need to figure out what. That's what brings me back to thinking, fuel not burning efficiently maybe? It just seems weird that it showed up after the cooler failure. Stealer said egr cooler is rare, so I'm kind of wondering what caused it. Could ithe cooler have over heated from to much egr flow to begin with?

The dealer said I could bring it by for a drive. He said they could log and send it to the manufacturer. I really don't want to fall down that rabbit hole.