Value assesment
Lead Driver
Joined: Mar 2010
Posts: 5,505
Likes: 256
From: Woodbridge, Ontario, CA
Has the high pressure oil pump ever been replaced? If I recall correctly, the '04 model year aluminum bodied high pressure oil pumps have known to have the "BB" blow out the side of the pump body, causing oil to leak out enough at idle speed to cause low pressure oil pressure to drop. All this is, is a gallery plug that is pressed into the side of the high pressure oil pump body. Fellow members here will be better able to explain the part I'm talking about, and maybe even post pictures of said part, in order to give you a better understanding. The low pressure oil pump is what feeds the high pressure oil pump by the way, if you're wondering. And the high pressure oil pump is what supplies high pressure oil to the injectors, in order to control fuel pressure injected into the combustion chambers under varying conditions.
Hotshot
Joined: Apr 2010
Posts: 19,071
Likes: 240
From: Saratoga Springs,UT
What He said^^^
I will Add it would be a Good Idea to pull the Oil Filter and give it a crank You want the oil filter housing to fill fairly Fast
You may need to hold the drain in the bottom of the filter housing down during the crank test
Or screw a Manual Pressure gauge into the Oil Press sensor spot and crank you are looking for around 20psi LPO IIRC
This will verify the Low Pressure side of the System then you can Move on to the High pressure side
So this will help separate LPO vs HPO Problems since High Press problem can Lead to Low (psi) LPO
I will Add it would be a Good Idea to pull the Oil Filter and give it a crank You want the oil filter housing to fill fairly Fast
You may need to hold the drain in the bottom of the filter housing down during the crank test
Or screw a Manual Pressure gauge into the Oil Press sensor spot and crank you are looking for around 20psi LPO IIRC
This will verify the Low Pressure side of the System then you can Move on to the High pressure side
So this will help separate LPO vs HPO Problems since High Press problem can Lead to Low (psi) LPO
Posting Guru
Joined: Oct 2006
Posts: 1,693
Likes: 7
From: Francestown, NH
If the HPOP is deemed to be the problem, do your research on replacing the pump with an aftermarket one versus a Ford one.
There are a few threads on here with users who report the 2003 - 2004 Ford ones being problematic, some failing again relatively soon after replacement.
The aftermarket one is made by Dieselsite. http://www.dieselsite.com/2003-20046...lpumphpop.aspx
I needed to replace mine and all the reading I did pointed towards avoiding the Ford pump. Your conclusions way be different but at least do the homework.
There are a few threads on here with users who report the 2003 - 2004 Ford ones being problematic, some failing again relatively soon after replacement.
The aftermarket one is made by Dieselsite. http://www.dieselsite.com/2003-20046...lpumphpop.aspx
I needed to replace mine and all the reading I did pointed towards avoiding the Ford pump. Your conclusions way be different but at least do the homework.
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