IPR open circuit, but still reads through ECM?

6speedsd

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Early 03 truck, bone stock other than egr ******, 260ish on the clock. No start hot on me the other day, wouldn't build past 210 psi. IPR was opening to 84% while cranking. Sat for 20 mins, and fired right up, so I figured high pressure leak somewhwre. However, cranked every single time the rest of the day, hot or cold. Hasn't been Driven since. Drove it today to monitor, all was fine, then just shuts off going down the highway. Same scenario, won't build past 210psi, IPR wide open. Reads 14ish KOEO. But this time, I get the code for IPR open circuit. Finally got my hand to the harness and moved it a little. Still nothing...except about the 3rd try at cranking, it just fired off. Sitting on 210psi, then hits and jumps to like 2500. Ran fine back yo the house, and has cranked 4 times in the past 1.5hrs without a hitch.

I said all that to say this....if it were an open in the wiring, would it still read correct rough the ecm? I'm seeing 14% key on, climbed as high as wide open when it wouldn't crank (84%), and it reads normal while driving...fluctuates up and down with load. If it was an open circuit wouldn't I get a false reading with a scan tool? I'm going to tear into it and trace wires when i get a free day, but that was confusing me as to why it still reads normal with a scanner, even when it won't crank.

Maybe since its showing wide open but not building icp that reading is biased and inaccurate?

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bismic

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The % duty cycle is not a valve opening number since the valve operation is modulated (duty cycle). In addition the % duty cycle number that you get from the PCM is a commanded number. There is no feedback from the valve.
 

Lubbockguy1979

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It could be some piece of trash that is getting caught. That was the issue with my 05. It would run fine. Then stall. The first two times it happened to me it restarted after some very long cranking. The 3rd time i could not get it to restart. I bought the truck from a guy who had the same issues i had. He took it to the ford house and was way out of town. Their diagnosis was metal in the fuel and quoted a 10k repair. It was a portion of the plastic from the ipr screen that some how broke and was lodged in the valve its self.... so keep that in mind.

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Lubbockguy1979

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Pictures of it
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Lubbockguy1979

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These are the codes i was also seeing. At the time the truck had a quadzilla module on it, the wrong oil cap but the correct filter which i was originally suspect of.
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wedge542

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RANDY,the more you crank on it without it starting the more codes will be shown,might be time to pull that ipr valve and clean or replace it,make sure you have some sort of insulation back around it when done,ck plugin while off.
 

6speedsd

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I have a spare IPR I may toss in it while I'm there. It's original to the truck as far as I know, but I've had it out before putting on new Orings and screen. I'll definitely pull and check out the screen though. He got a few of those codes as well, but I'm sure they were from the long extended crank times...cam and crank sensor codes, ICP low is obvious since it wouldn't build pressure.

P2623 is the exact IPR open circuit code he got, which he didn't get the other day when it happened.

This truck is a bit of a 6.0 myth buster. 260k miles, just had injectors replaced earlier this spring, has had a couple oil coolers, EGR got ******d years ago, did new ICP sensor and pigtail when I did the most recent cooler, and other than normal wear and tear items (alternator, starter), it's pretty much still original. Still has the original HPOP! And it hasn't really been taken care of either.


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Lubbockguy1979

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RANDY,the more you crank on it without it starting the more codes will be shown,might be time to pull that ipr valve and clean or replace it,make sure you have some sort of insulation back around it when done,ck plugin while off.
Those codes were circa 2015 maybe. Probably at least 25k ago. I am aware of the crankshaft pos sensor codes. The pictures above the show where the ipr screen was off, and the tiny piece of plastic that broke off the screen. It was my issue.

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78f100

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It is most likely the harness but I have seen several valves go open internally. Like they already said the % you are seeing is just what the pcm is telling the valve to do, doesn't mean the valve is actually doing what it's told.
 

bismic

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It is most likely the harness but I have seen several valves go open internally. Like they already said the % you are seeing is just what the pcm is telling the valve to do, doesn't mean the valve is actually doing what it's told.

Nice post .... GREAT signature!
 

6speedsd

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Thank you gentlemen. It'll Be first of next week before I get to fool with it, but ill report back what I find.

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6speedsd

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Icp/IPR harness

He let a "mechanic" do the EGR ****** and changed the ICP close to 10yrs ago. Those wires are stripped, not worn through. All I can figure is he was testing the sensors... only reason I can see for stripping wires like that. He just bundled them up and threw some tape on it. Going to change the IPR and harness and fix that wiring. Changing the ICP too... leaking oil out the guts bad.
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6speedsd

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Forgot to add this one too.

Drove it a little yesterday and it's running fine so far. Fires up quicker than before. Time will tell if that was the fix but I think it was. Needs to order a turbo seal kit....pushing a little oil out the exhaust side. Another project for another day.
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ghohouston

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Forgot to add this one too.

Drove it a little yesterday and it's running fine so far. Fires up quicker than before. Time will tell if that was the fix but I think it was. Needs to order a turbo seal kit....pushing a little oil out the exhaust side. Another project for another day.
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Vgt solenoid pigtail?
 

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