Turbo acting up?
I have 2003 6.0 with 95k miles. Factory turbo is installed. The other day i was driving and came to a parking lot to park my truck and get out when I just happened to here the turbo wind down right before I shut the truck off. I have the truck straight piped so I can hear everything it does. It would wind down for a few seconds and then take off again. This was at idle. Shortly after I got back out on the road and noticed at one time it winded down and didnt wind back up I had no power but then all of a sudden took off and winded back up... So confused as to what is happening. Vanes sticking? Sensors? HELP! I had a P0238 code to flash at me other day. OBDII and deleted it.