Join Date: Oct 2014
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Here is the TSB.
For this sort of problem, making a video so that we can hear the knock may be your best plan of action. Given your post count, your best bet is probably uploading it to YouTube and then posting a link that is slightly disguised.
Ex: w w w . you tube . com/ XuiR5E8 (remove the spaces).
2004 F550 CC Lariat
BPD oil cooler relocation and upgraded EGR cooler (spooled), BPD oil bypass filtration, aFe Magnum Force CAI, Mishi radiator, 7.3L fan clutch, EC1 ELC, XDP coolant bypass filtration, '08 trans pan/filter, PTP direct clutch solenoid, blue spring, 6.4 starter, MBRP y-pipe, BD boots/clamps, '05 intake elbow, ccv reroute, Torque Pro + OBDLinkô LX, Autometer EGT