6.0 Dies, no LPO - Ford Powerstroke Diesel Forum
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Old 12-15-2012, 05:34 PM
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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

HPOP
LPOP and front cover
EGR DEL
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)
4" exhaust
lift...
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.
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Old 12-15-2012, 05:35 PM
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oh, and yes, I have searched and used the sticky's and everything I can come up with to run tests and check. Im at a loss.
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Old 12-15-2012, 08:10 PM
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Did they replace the pressure releif valve for the LPOP?
You might see how it acts with the a$s end of the truck up in the air to see if it continues to make pressure. That will submerge the entire pump in oil so if there is a pick up issue or front cover problem (still) or even meshing issue it wont loose it's prime.
If it still loses pressure after heating up I would think the releif may be what's going on with it.
Hopefully someone will chime in that has seen this before. I again would try submerging the oil pump from nosing down truck.

What year is your truck?
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Old 12-15-2012, 09:12 PM
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the front cover came with a new relief valve and yes we put it in, we have also considered the pickup problem. We have run it with the rear end on a lift, i would say the tires a foot or more off the ground. We have also tried over filling it by a gal to see if it had a cracked pickup tube or bad oring. Neither changes it. Whatever it is has gotten progressively worse even with new parts being put in.

The truck is an 05 with about 109K on it
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Old 12-15-2012, 09:26 PM
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Since you have covered the oil system maybe you should look at the fuel system.
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Old 12-15-2012, 09:36 PM
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Im not sure I understand. Could a fuel system problem cause a loss of low pressure oil? There is for sure a problem somewhere with oil. It looses pressure as it gets warm. Is there something in the fuel system that could cause that?
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Old 12-16-2012, 08:20 AM
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Sorry not thinking clearly

Sorry wasn't thinking clearly the situation I was thinking on actully couldn't happen. Thought maybe some injector oil valves were partially stuck open, but that cn't physicaly happen.

So assumeing they gave you the right pump and cover and your regulator valve was installed correctly there are only a few things to make it loose pressure.

If you have a 03/04 pump there is a ballbearing plug pressed into the pump body. If it comes out the hpop will loose oil faster than the lpop can supply.
The truck useually wont be able to start but sometimes does.

Damaged or missing filter houseing components drain valve, filter bypass valve, damaged filter stalk/tower.

Oil filter and cap mismatch, the filter not being able to close off the dain valve. Most common with a wix cap and a different filter. Wix filters are 1" longer/taller than any of the others and come with their own high domed cap to accomodate them. For example a wix cap and a motorcraft filter with the filter snaped into the cap the filtre won't even touch the drain valve never mind close it.

Hope this helps more.
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Old 12-16-2012, 09:06 AM
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i would have a close look at that drain back valve in the filter housing. make sure everything looks ok there. how exactly did you test the ipr? did you duty cycle it with shop air hooked up and monitor pressure? was the problem occurring when you tested the ipr?
another test you can try is to dead head the hpo system, and air it up with the oil filter cap off. if you hear any hissing out of the filter housing, the hpop is bleeding back. i know you replaced it already, but who knows, maybe bad out the box.
a loss in oil pressure on the high side is going to result in a loss on the low side if you're just monitoring through a gauge plumbed into it. the low side needs to be isolated if you want to confirm that.
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Old 12-16-2012, 09:10 AM
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how did the old lpop housing look? was it extremely scored at one side? i'm just wondering if maybe the housing was slightly off center
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Old 12-16-2012, 09:53 AM
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