High DC, Low ICP
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Elder User
Joined: Feb 2006
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From: Eastern Ohio
High DC, Low ICP
2000 PSD 35x,xxx on her. No external HPO leaks, nothing around the injectors all flowed about the same. Starts fine, runs fine, low on power and losing fuel milage. Some times has a miss from a sticking injector when cold that goes away in about a minute. Holding 55 psi of fuel pressure.
Stock-WOT runs 1100-1200 ICP, 65% DC. Idle 450-500 ICP 7%DC
Superchips (junk) on Performance- 700-900 ICP, 98%DC. Idle 450-500 7%DC
ICP will spike 3200-3600 psi for a few seconds after let off it.
So what do you all think? Time for a T-500 or just a bad IPR? Any other idea's?
Thanks, John.
Stock-WOT runs 1100-1200 ICP, 65% DC. Idle 450-500 ICP 7%DC
Superchips (junk) on Performance- 700-900 ICP, 98%DC. Idle 450-500 7%DC
ICP will spike 3200-3600 psi for a few seconds after let off it.
So what do you all think? Time for a T-500 or just a bad IPR? Any other idea's?
Thanks, John.
Posting Guru
Joined: Jan 2007
Posts: 2,364
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From: Gilbert Az.
I change out LPOP around 200k as I have found that's where most have lost enough volume to have a hard time keeping the HPOP sufficiently fed, I'm with Matt get a new LPOP in it and be surprised.
Jim & fat Monty
Jim & fat Monty
Cargo Master
Joined: Jun 2010
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From: Louisiana
As much as I'd like to know if that would work I'm not sure it will help. Tell ya what do us all a favor and change the lpop and let's see if it helps! If it does great, now put the T500 on and see what she does. With that many miles it wouldn't hurt changing the lpop anyhow. Have you ever changed the lpop? Clay sells em!
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From: AL, Reform
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Joined: Feb 2006
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From: Eastern Ohio
I've only had this truck 5 or 6 months, so I don't know to much of it's history, just what have found to have been replaced and no real clue on when any of that was done.
I will try to get the LPO gauge hooked up tomorrow and get some before and after readings on the LPOP. I would like to replace it with the miles on her anyway, this just gives me reason.
I will try to get the LPO gauge hooked up tomorrow and get some before and after readings on the LPOP. I would like to replace it with the miles on her anyway, this just gives me reason.
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From: Damon (South East Texas)
I recently changed out my stock LPOP at 188k miles and didn't see any increase in ICP at WOT under a load. I do have great pressure to begin with and didn't change it for that benefit.
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From: Eastern Ohio
I had to order some things from dieselorings.com (Great guy to deal with, made 2 orders over the weekend they where combined and shipping refunded with out me even asking) to get my gauge hooked up, finally got to it today.
Here's the findings, Fuel pressure 55psi, will drop a pound or two when first floored but recovers in a second or two. Low pressure oil is holding 40 psi in the HPO reservoir at WOT so I think the LPOP can be ruled out. I changed the IPR with another one I had around, cleaned and checked to move free, tried both solenoids, no real change. I also found a reman sticker on HPOP and it appears fairly new as do the HPO lines.
I'm now thinking that either an injector o-ring started leaking in the couple thousand miles since I had the VC's off, an injector came loose or an oil galley plug under the valve cover fell out.
Sound like I'm heading in the right direction?
Here's the findings, Fuel pressure 55psi, will drop a pound or two when first floored but recovers in a second or two. Low pressure oil is holding 40 psi in the HPO reservoir at WOT so I think the LPOP can be ruled out. I changed the IPR with another one I had around, cleaned and checked to move free, tried both solenoids, no real change. I also found a reman sticker on HPOP and it appears fairly new as do the HPO lines.
I'm now thinking that either an injector o-ring started leaking in the couple thousand miles since I had the VC's off, an injector came loose or an oil galley plug under the valve cover fell out.
Sound like I'm heading in the right direction?
still plays with trucks
Joined: Mar 2004
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From: Twin Falls Idaho
To me the pressure and low DC at idle rules out much of a leak. if it was leaking at a plug or o-ring it would show up with a high DC at idle as well as WOT. what is your fuel pressure at WOT? if the injectors aren't full, there is nothing for the HPOP to compress. so the oil just blows through causing high DC and low pressure.
Barney
Barney
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From: Eastern Ohio
I think your right. Especially after reading this post. https://www.ford-trucks.com/forums/1...l#post10487083 It fits my truck pretty close. DC and ICP are almost exact. I'm wondering if there may be a problem with these reman pumps?
I'm going to get the hose made up this week to test the heads, just to be sure and because I know I have one injector that is not so great. I have old porta-power that rarely gets used that I may fill with 15-40 and dedicate to purpose, I don't really want to fill the HPO system with hydraulic fluid.
Any other thoughts?
I'm going to get the hose made up this week to test the heads, just to be sure and because I know I have one injector that is not so great. I have old porta-power that rarely gets used that I may fill with 15-40 and dedicate to purpose, I don't really want to fill the HPO system with hydraulic fluid.
Any other thoughts?
Post Fiend
Joined: Mar 2007
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From: Texas
I've read several threads over the last few months about weak HPOP's that had a reman sticker on them. If you get a chance, post up a picture of the reman sticker showing what it looks like and where it's mounted.
All of those threads were fixed when a new HPOP was installed, of course no one posts a thread talking about how well their reman HPOP is working so that's not exactly surprising the ones we read about are failures.
All of those threads were fixed when a new HPOP was installed, of course no one posts a thread talking about how well their reman HPOP is working so that's not exactly surprising the ones we read about are failures.