The ford let me down
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Fleet Mechanic
Joined: May 2011
Posts: 1,866
Likes: 84
From: Rainier OR
The ford let me down
Sitting on the side of the road. Engine just died. Looks like no low pressure oil pump pressure. Oil gage will not move and no hpop pressure. Ipr is at 85%. Anyone know why I would loose low pressure oil pump pressure? Oil is full and looks good. No problems till today.
Lead Driver
Joined: Dec 2006
Posts: 6,496
Likes: 94
From: So. Jersey
Are you able to pull the filter and verify it's not pumping? Use the starter wire near the passenger side firewall to crank it so it doesn't accidentally start. With the filter removed you should see the oil come up while cranking.
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Fleet Mechanic
Joined: May 2011
Posts: 1,866
Likes: 84
From: Rainier OR
Correct oil filter cap. Yes, I believe it's the lpop that is the problem. Have a tow truck comming. Will check things out when I get it home.Truck is 2003 but motor is 2005
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Fleet Mechanic
Joined: May 2011
Posts: 1,866
Likes: 84
From: Rainier OR
Lpop relief valve looked good, removed the oil filter and the housing refilled slowly when cranking. I will put a mechanical gage on in the morning to read lpop pressure. Now I am starting to think ipr or hpop leak. It has been starting fine both warm and cold. I was going up hill an accelerated slightly to go around a log truck, just shut down all at once, like turned off the key. Used the torque pro app to look at hpop pressure and ipr. Ipr at 85%, pressure under 50 psi.
Lead Driver
Joined: Dec 2006
Posts: 6,496
Likes: 94
From: So. Jersey
Lpop relief valve looked good, removed the oil filter and the housing refilled slowly when cranking. I will put a mechanical gage on in the morning to read lpop pressure. Now I am starting to think ipr or hpop leak. It has been starting fine both worm and cold. I was going up hill an accelerated slightly to go around a log truck, just shut down all at once, like turned off the key. Used the torque pro app to look at hpop pressure and ipr. Ipr at 85%, pressure under 50 psi.
STC is where I'd start if you're getting good base pressure and the IPR is clean. Air test should show it.
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Fleet Mechanic
Joined: May 2011
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From: Rainier OR
I bought it with the swapped engine, I has head studs and I was told it was fire ringed. I don't know if the sct was changed, but if the heads we here off I would think thy would have updated. I was also told that it had new stand pipe when I bought it.
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Thread Starter
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Fleet Mechanic
Joined: May 2011
Posts: 1,866
Likes: 84
From: Rainier OR
Put a gage on the LPOP and it slowly went to about 60-80PSIG when cranking. Took it all apart and it does look like a new oil pump and it does have the updated STC (non STC?). I replaced the IPR with a new Ford one. I checked the old one by connecting it to battery and I could not feel it engage every time. It did work right when I pressure tested the HPOP system with shop air though.
Seems to idle better and start quicker now. So far after two 20 min drives all is well. The no OP gage reading COULD have been from a bad oil pressure switch pigtail. I had a new one so I replaced it when I had it apart. I can not thing of anything that would have allowed for no LPOP pressure and now it be back to normal. Oil level was and is good, FOMOCO oil filter and cap. no sign of foaming. I was not running hard when it died and ambient temp was in the 60s.
Thanks for the help!!!!!!!!
Seems to idle better and start quicker now. So far after two 20 min drives all is well. The no OP gage reading COULD have been from a bad oil pressure switch pigtail. I had a new one so I replaced it when I had it apart. I can not thing of anything that would have allowed for no LPOP pressure and now it be back to normal. Oil level was and is good, FOMOCO oil filter and cap. no sign of foaming. I was not running hard when it died and ambient temp was in the 60s.
Thanks for the help!!!!!!!!
Posting Guru
Joined: Nov 2012
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You have to get enough oil from the low pressure pump before you can get enough oil pressure from the high pressure pump. The low pressure system supplys the oil to the HPOP resivor, no oil in the resivoir no HPOP output possible no matter whether the IPR works or not.
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Fleet Mechanic
Joined: May 2011
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From: Rainier OR
I did not replace the ipr because of the no responce, it also felt like it didn't move the first couple times I pushed on the stem. I ended up dameging the screen when I removed it and it would have taken a couple days to get a seal kit. It was also the only thing other than a lpop failure that could have caused the problem, and I have lpop pressure.
Posting Guru
Joined: Nov 2012
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The problem I see is you state it slowly builds pressure to 60 PSI.
You should get pressure within a few seconds like 3 or 4 unless the filter is draining dry for some reason. Like the check you have the right cap with the right filter.
You should get pressure within a few seconds like 3 or 4 unless the filter is draining dry for some reason. Like the check you have the right cap with the right filter.
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Fleet Mechanic
Joined: May 2011
Posts: 1,866
Likes: 84
From: Rainier OR
I have not disassembled an ipr valve but from the looks of it it is a small pilot valve the opens and closes and uses oil pressure to actually move the main ipr valve. That it the way almost all hydraulic valves work. The electric coil has pretty strong holding power, but very low moving power.