Join Date: Nov 2009
Location: Sacramento, CA
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Mine was doing similar, only as EGT's exceeded a certain point while lugging the engine (usually in OD at 50-55 mph, I got no codes or CEL though). I was advised to try unplugging the EGR valve once it is closed (engine off), and see if that resolves the issue. In my case, it did, so I need a new EGR valve.
I should probably mention, before I had my head studs/gaskets done, the head gaskets were leaking, and the engine exhibited very similar symptoms.
2005 F350 SD Crew Long Bed FX4 Dually Lariat, 6.0L PSD. 4" catback, 3.5" dp & cat delete, Sinister Diesel coolant filter; Bulletproof EGR cooler, ARP studs. 380k+