Well... this gets talked about a lot. Im sure the answer is some were..


Alright so, History first. Prolbems 2nd

05 f250 6.0

Bought it about a year ago.. had 160k on dash.. Ran fine from my understanding of diesel sounds VS V8 gas motors.. daily drove it for a month or more not real sure how long.. noticed Puking from the coolant box.. had some APR Head studs i was going to install in our f550 along with Head gaskets.. Also put in a new oil cooler.. So pulled it in the shop changed all that put everything together drove it from the start of summer tell about 3 weeks ago. When i was driving down the road and it shut down.. No odd sounds, gauges all looked good... Just died.. tried to start it again and it fired made it about 300 ft with it sounding very sickly like ive lost all but a few injectors.. so shut it down and towed it back home.. thinking My Diesel turned to gel because i forgot to add anti gel for winter and tank was under a quarter figured that was it... got her all warmed up... Code on dash then came up after i got it home and had it sit outside before i pulled it into the building and got a code for water in fuel... OK so must be it... drained the water added a full tank of fuel added anti gel Crank no start...

Scangauge2 readings
IPR 14.8 key on to 85% Cranking
ICP Reads 0 even after long cranks 30 secs at a time did this for about 5-10 mins..
Sync = 1
FICM 48


Now i have made some mistakes here in testing everything..

First i did take the oil cap off and looked for oil... FORGOT to crank it to see if i had any oil coming up for Base oil pressure..... But it did have oil in the housing when i pulled the filter out..

Pulled the IPR valve out to look at it make and sure the spring moved freely and wasnt plugged by anything.. looked at the screen its Clean just a little loose fitting around the base were it snaps to the IPR valve..

Replaced it with another one Not sure if its working or not but tryed it also.. still no ICP still shows 0 on the scangauge

Didnt have a fitting to check for leaks.... So moved on to the low pressure pump.. pulled the plug on the bottom front cover.. a little oil did drain out very little id say but oil did drain.. checked the inside with a magnet... i found no metal

Pulled the valve covers, pulled the turbo off. Got the fitting to check for leaks Driver side didnt hear a thing.. Passenger side is leaking or it might be the Hpop leaking... i dont see any mist coming out of the passenger side oil rails felt for air... NO AIR

Checked stand pipe still looks fine checked dummy plugs still looks fine..

When air is applied it sounds like gurgling sound coming from some were around the stand pipe Hpop area.. I have not taken off the top cover for the HPop yet to inspect it..

My Scanguage isnt pulling any codes but its only a scanguage2...



Id say my lpop went out or some other fittings or hoses failed...Because im building no Low pressure oil.. But i have no metal in the lpop side that i can tell...

I hear air and a gurgling sound some were around the back half of the motor on the passanger side... So that makes me think STC or Hpop problems

Im in no way a diesel mechanic.. I fix most of my stuff from youtube videos and or Buddies coming over to give some advice.. SO any advice would be great

 

First you need to verify LPOP with a gauge. Filling the oil filter housing is a good indication but not 100% conclusive. My best guess is a bad STC fitting on the HPOP, but you could also have other high pressure leaks, even if you don't find them leaking now I would replace dummy plugs and stand pipes before putting it back together.

 

My bet is the SCT

 

Alright took off the Hpop cover and screwed the IPR valve back in to keep air from coming out...

What i found was a bunch of air rushing out of this hole in the picture...

 

Also their was little to no oil inside the Hpop was pretty dry inside.. I did put my finger over the hole to plug the hole and herd little to no air coming out.. i Did look at the STC fitting and it seems to be fine.. no air and no bubbles coming from or around the STC fitting..

 

guess people gave up after the first 2 posts???

 

The IPR is normally open, you'll have to energize it to close it, I believe that hole is where it discharges excess pressure. This second generation style pump rarely fails. On the T shaped fitting coming off the pump, does it have a plastic section in line with the gear or is it smooth pipe like the one in the picture?

 

its like the one in the picture..


But my question still stands does the Hole in the picture mean anything? its the Red line pointing to the hole i found air rushing out... is this normal???
Im only asking to better understand the truck that i drive and work on.. Im not trying to offend

Some people say if its working right you will hear a very slight air sound.. but this is like night and day

Im sure my problem is in the lpop system... so i guess this is really above what i can do myself so i guess next step is pay someone a few grand to tell me why it isnt working

 

The low pressure oil pump is in the timing cover, behind the harmonic balancer. Not too hard to work on but you do heed a special puller to get the balancer off. What you are looking at is the high pressure pump. The IPR (mounted right on the pump) is normally open, allowing much of the pressure and volume to bleed off like you are seeing with the air. When the PCM commands more high side oil pressure like during high throttle/rpm/load situations the IPR closes (increases duty cycle) closing the valve more and allowing less oil to come out of the hole and bypass the injectors. Low side oil pressure is less than 100psi, the pressure of the pump in the picture can be as high as 4,000psi.

 

So a closed IPR
Is like if you stick a screw driver or whatever else and push the IPR spring in..
open right??
Or does that mean its closed?

Again sorry im not a diesel mechanic and im just trying to better understand the things i think i understand lol



Ether way my Hpop is totaly dry inside.. and you need Lpop to feed HPop.. and vise versa right??? it works in a loop so to speak?

 

Yup, IPR is spring loaded to open, electrically driven to closed.

It is a loop in a way, low side pump pulls oil from the pan and in addition to lubricating the crank/rods etc, it fills a reservoir cast into the engine block in the front of the "valley". High pressure pump pulls oil from that resivoir and sends it to the injectors as need and vents the rest out of the hole on the side of the pump, where it drains back into the oil pan by gravity.

 

Ok, Well i know the problem is in the Lpop side now after looking at the top of the motor and everything seems to be fine.. So now its time to take the front cover off and buy the tool to take off the balancer..

Hoping the Hpop and injectors are still ok after starving them like this..

 

Did you try unplugging the ICP sensor and starting the truck? From what I hear, if it's bad it will read 0 oil pressue and not allow truck to start.

 

You know, no i didnt try that i just pulled the plug and did the air tests... i`ll have to try that after i get the top half back together again.. I should be able to use one from a 03-04 f550 right?? same motor but mines a 05 and the F550 is 03-04



Thinking about it now when i pulled it out.. Their was oil on it... lol im going to cry if this was the only issue... I didnt even think about this when i pulled it out... SMH

 

They are probably the same. O'reilly auto parts lists the same part for f250-f450, 04-07.