It being an 2006 6.0L, I'm kind of surprised that you needed a new HPOP as they have been known to be pretty stout. The earlier model 6.0's had weaker HPOP's that were problematic. Long crank sounds like a leak in the HPOP system to me. Maybe the dummy plugs or stand pipes need to be replaced. Also, I would hope that your mechanic installed an newer updated STC Fitting on the HPOP.it’s a 2006.
well it starts hard anywhere after sitting for a couple of hours so overnight and stuff"It only happens when it sits" For a couple of minutes? For a couple of hours? Overnight?
You're going to have to figure out how to get some real numbers - otherwise we're just throwing darts at the wall.
There is a wealth of knowledge on this forum for you to review. You should just go through similar threads and learn from those that came before you. I was new to Diesels about 7 years ago and now can do all of my own work. There are 2 dummy plugs and 2 stand pipes. Each can have o-ring failures that cause the symptoms that you have described.well i did get some dummy plugs replaced but i don’t know how many. that was my idea at first but it’s still makes a weird noise. i see there anyway i can attach a video somehow?
You are correct. The Forscan lite app for iphone monitors all of the PID's you mentions. And yes, you need a wifi odbii adapter from Amazon. the whole setup cost about $30You should download one of the monitoring apps like forscan. I think you'll need a wireless dongle to connect it to the vehicle.