I recently had the CEL come on so I took mine to the dealer with an explananation of my issues, including the the noise. The tech found a TSB that said to replace a heater hose of all things. I still don't understand the realationship but it did seem to help. It still makes a noise when...
I have the same noise on my 08 6.4 but it doesn't happen on every shutdown. I usually hear it when I come home which is all uphill. I can also detect it when letting off the throttle after climbing a long grade. I had my son turn off the ignition while I had my head under the hood. Noise is from...