Midland Oilfield Posted September 16, 2021 Share Posted September 16, 2021 I'm working on a 2014 GU713 that went into derate. During the course of trouble shooting I found that the EGR cooler was leaking. Even though the truck was in derate it was running normally. After I changed the EGR cooler, I fired the truck up and the truck started over fueling. A lot of raw fuel is getting into the new EGR cooler and is going through the turbo to the exhaust. What few minutes I had the truck running it showed to still be in derate but did not show any codes other than an oil pressure switch being out, there are no derate codes. If anybody could point me in the right direction it would be very helpful. I had this happen once before and the local Mack dealership said it was because the turbo lost calibration, but I dont know how to confirm that possibility now without towing this truck to them. Any in sight yall might have would be great. Quote Link to comment https://www.bigmacktrucks.com/topic/68164-2014-gu713-help/ Share on other sites More sharing options...
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