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6.0 Dies, no LPO
Ok, this is going to be LONG, but i want to cover everything if I can.
The truck has in the last 6 mos and 1000 miles all new
LPOP and front cover
injector o-rings (i cant verify that but was told by previous owner a shop did it for him AND they said they did it again when we took it there) I will leave the shop name out for now.
Factory oil cap and filter, just to be sure.
It has been to 3, yes count them again, 3 shops. No one can figure it out. 2 of them are very well respected diesel shops in this area.
When cold, I mean cold, 25-40 it starts with 75-80 psi on the low pressure side. Readings with a mechanical gauge.
Within 20 min of idling, as it gets warm 180ish, it gradually drops to 0 on the LP side. again with a mechanical gauge. IPR is being commanded to 85% but there just isnt any oil there.
It starts and runs great, when cold. Maybe what feels like a small miss at idle but clears up immediately if its raised off idle.
Other things I know done to the truck
RCD 90 horse injectors.
Tuner (currently programmed back to stock)
Cheap gauges, ex temp, boost, trans temp
OK, on to the story
My father in law bought this this truck from a guy, took it on a drive of about 30 miles round trip. Drove fine. Next day long crank but started. Another 15-20 miles drive and it died. I towed it home and did as many tests as I could find on the net. Basically decided it needed a new HPOP. or the STC fitting. I didnt want to do in the driveway so we took it to a shop. Both were replaced. No start. They said we give up, you dont owe us for labor take it out of here. So it got towed home. More testing and we replaced the LPOP, and front cover. Started and ran fine. Drove about 400-500 miles, died near home.
Had it towed to one of the mentioned local shops. They said recall on the o rings on the injectors. Said they put them in. Went to pick up the truck, made it 5 miles, died..........
Was hell to restart but eventually pressure on the dash came up and I got it to the house.
Got it to another local independent shop, so far lots of testing. Air test on the HPO system shows absolutely no leaks. Hooking the IPR up to jumpers and commanding open doesnt change the low oil pressure. We have done and checked every forum and test I can find and nothing. I have tried everything and so has the guy in the shop. He is a cummins guy really but he has 20+ years on diesels, knows the 7.3 really well. Still, no one is sure about anything.
Where do I go from here? The truck will start cold perfect, sometimes long crank and sometimes not. I can watch the gauge drop the warmer it gets. What else can cause this in the LPO side? Im basically convinced its a LPO problem. After LPO goes away completely the truck will continue to run, for a few minutes, I assume until the resi for the HPO runs dry.