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Old 12-20-2019, 08:52 AM   #6 (permalink)
paoutdoorsman
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Join Date: Nov 2006
Location: South Central PA
Posts: 1,000

Got this figured out last night. The EGR valve was stuck open at 55%. My Actron scan tool showed the actual vs commanded EGR position and while the truck was being stupid, I could see the ECM was commanding 0% open, but the valve was actually stuck around 55%. A few key cycles later, and a few light hammer taps on the EGR valve, it free'd up and starting moving to commanded position. Instantly the truck runs flawlessly again. New EGR valve ordered.
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