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After reading most of the threads on cleaning it seems to be a toss up about disconnecting the batteries before unplugging the EGR. I rather not disconnect & have to relearn. What's the OH shi.... side of not disconnecting the batteries?
Just pulled and cleaned mine this past weekend. I didn't disconnect the batteries. Everything is running good, no codes or anything. I can't recall reading anywhere that the batteries need to be disconnected to clean the EGR valve?
I've never heard of disconnecting the batteries either, and I've cleaned mine 4 or 5 times. Heck, I don't even disconnect both batteries at the same time when changing them. Here is a good link to cleaning the egr valve though... 6.0L EGR Valve Cleaning - DTS Articles - Articles - Articles - DTS