Join Date: Nov 2010
Location: South Fayette/Pittsburgh PA
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you are probably over boosting from a stuck turbo or something along those lines.
Are you still running an EGR setup? If so the valve could also be weakening internally and opening too far under high boost situations.
Ford Senior Master Tech
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2015 F-250 XLT 6.7L
2006 F-250 6.0L SOLD