I am working on a 2006 6.0. It's got 228,xxx on it. I put an HPOP on it with all the goodies on it about 10,000 miles ago. Customer has brought it back this week saying all the sudden it will run great, you'll go park and go in somewhere for 10-15 minutes and come back and it won't start for several hours. I've searched high and low and can't seem to find anything wrong. When it goes into it's tiff it will crank fine, ficm voltage is like 49, synced, and Desired and actual icp are at like 490-550 depending on when my genisys refreshes. It has a couple codes in it for 2-4 glow plugs circut and a egr code. Does anyone know where to start on this??
Any thoughts, comments, ect are much appreciated.
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