7.3 NO OIL PRESSURE--fixed?? - Page 2 - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 12-10-2005, 11:06 PM   #16 (permalink)
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Re: 7.3 NO OIL PRESSURE

Gentlemen
I think that I have found the problem. The long way around but what can ya do.

I have changed out the IPR and the truck is now running. I will know better tomorrow after I can run it for a while but as of right know I think that was the problem.

Back to the beginning:
The truck was running on the highway when it lost power after dropping down into first gear it started. This is the reason that the IPR was initially over looked. I thought that when they failed they failed for good.

--I started buy checking for oil in the HP reservoir and it did look low. (Having found the problem I think this is due to the fact that the IPR was not letting oil flow up to the reservoir but the HPOP was still trying to pump out what was in the reservoir.)

--The next move was to get the truck into the garage and pull the LPOP. It looked like it was ok.

--I checked to see that the pick up was not broken by taping off the feed slot to the LPOP (the one connected to the pickup) (lower slot) with some clear plastic tape, pocked a hole in it, and then used a small vacuum bleeding hand pump to pull a vacuum. Once I saw that the oil had come up onto the tape I new it was not the pick up. If it was cracked or broken I would not have been able to pull the air out fast enough to draw up the oil.

After looking at some parts from another 7.3 I am almost positive that the newer 7.3 do not have a check valve to keep the oil in the hp reservoir. It looks like there is a feed tube in the reservoir that runs almost al the way to the top, so once a small amount of oil drains back and the level is below this tube it can not drain any farther. I could be wrong but that is the way it looks in the spare housing.

I hope that this will hope someone out in the future.

I will place another post tomorrow and give one final update.

Once again I would like to thank everyone that has tried to help.

Daniel [img]/ubbthreads/images/graemlins/shrug.gif[/img]
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Old 12-10-2005, 11:19 PM   #17 (permalink)
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Re: 7.3 NO OIL PRESSURE

I am sorry I did not see this post earlier, you were given wrong information above... If you fill the reservior with oil and it still will not start, it is definatly a HPOP/IPR problem. The pressure guage is on top of the reservior, obviously your IPR o-rings were broken and all the oil was dumping back to the pan.
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Old 12-11-2005, 01:59 AM   #18 (permalink)
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Re: 7.3 NO OIL PRESSURE

[ QUOTE ]
I am sorry I did not see this post earlier, you were given wrong information above... If you fill the reservior with oil and it still will not start, it is definatly a HPOP/IPR problem. The pressure guage is on top of the reservior, obviously your IPR o-rings were broken and all the oil was dumping back to the pan.

[/ QUOTE ]

Or a Stuck open Injector
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Old 12-11-2005, 04:06 AM   #19 (permalink)
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Re: 7.3 NO OIL PRESSURE

I have delt with a couple trucks that had stuck open injectors, both of them were able to run and start...
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Old 12-11-2005, 09:42 AM   #20 (permalink)
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Re: 7.3 NO OIL PRESSURE

[ QUOTE ]
After looking at some parts from another 7.3 I am almost positive that the newer 7.3 do not have a check valve to keep the oil in the hp reservoir. It looks like there is a feed tube in the reservoir that runs almost al the way to the top, so once a small amount of oil drains back and the level is below this tube it can not drain any farther. I could be wrong but that is the way it looks in the spare housing.



[/ QUOTE ] This is the correct operation of the high pressure oil reservoir. The newer 7.3s, not sure on what year this happen, check valve does nothing except to give you unfiltered oil to the reservoir on start up and closes off the unfiltered oil when the oil pressure comes up on the filtered side from the main oil galleys. This is to give the reservoir the amount of oil it needs on cold starts as quick as possible. I have never seen a oil check valve drain a reservoir on the later 7.3s. The stand pipe in the reservoir keeps the oil from draining back to the sump. A leaking IPR could cause your problems but I think the low pressure oil pump would give you enough pressure to make the gauge move. They also changed the low pressure oil pump and pickup location slightly to prevent oil drain down.
This is one of the first posts I have seen that describes the proper operation of the oil check valve and reservoir.
If the IPR replacement took care of your problem this would not be the first time I have seen a issue like this.
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Old 12-11-2005, 10:25 AM   #21 (permalink)
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Re: 7.3 NO OIL PRESSURE

[ QUOTE ]
I have delt with a couple trucks that had stuck open injectors, both of them were able to run and start...

[/ QUOTE ]I have had more than a few with Stuck Poppets dumping Out Oil and Neither would Build enough HP Oil pressure to fire the Inj. [img]/ubbthreads/images/graemlins/shrug.gif[/img]
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Old 12-11-2005, 02:02 PM   #22 (permalink)
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Re: 7.3 NO OIL PRESSURE

[ QUOTE ]
[ QUOTE ]
I have delt with a couple trucks that had stuck open injectors, both of them were able to run and start...

[/ QUOTE ]I have had more than a few with Stuck Poppets dumping Out Oil and Neither would Build enough HP Oil pressure to fire the Inj. [img]/ubbthreads/images/graemlins/shrug.gif[/img]

[/ QUOTE ]

Could be that I had the ICP sensor unhooked when that worked for me, the truck will start with less oil pressure when that sensor is disconnected. [img]/ubbthreads/images/graemlins/shrug.gif[/img]
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Old 01-13-2011, 10:06 PM   #23 (permalink)
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my truck is haveing a similar problem my truck wont start. after i replaced all the injector orings . now the truck wont start and the oil preshure gauge isnt even moveing
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Old 01-14-2011, 12:25 AM   #24 (permalink)
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my truck is haveing a similar problem my truck wont start. after i replaced all the injector orings . now the truck wont start and the oil preshure gauge isnt even moveing
Why don't you delete this post and start a new one, this thread is 5 years old. You will get better answers.
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Last edited by Bill1013; 01-15-2011 at 03:56 PM.
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Old 01-14-2011, 09:04 PM   #25 (permalink)
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Why don't you delete this post and start a new one, this thread is 5 years old. You will get better answers.



im a new member and i dont know how to do it ? can u help guide me ?
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Old 01-14-2011, 10:13 PM   #26 (permalink)
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im a new member and i dont know how to do it ? can u help guide me ?
Sure, go back to the main forum listing for the 7.3 and click on the button that looks like this It's at the top left hand side of the screen just above where the threads are listed. If you can't find it, click here
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Old 01-15-2011, 03:58 PM   #27 (permalink)
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im a new member and i dont know how to do it ? can u help guide me ?
To delete that post, click on the Edit button there, then you will see a Delete button at the bottom.
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