I need a little help with a P1211 fault code

[Mark Mi]

I need a little help with a P1211 fault code in a 2002 7.3 Powerstroke engine.
I drive down the road, and the check engine light comes on. The engine loses power then the smoke pours out. I pull off to the side of the road and shut the engine down and wait about two minutes. Then I restart the engine, the fault code disappears for about ten minutes or when I go above two thousand rpms. When I came back to the shop where I work I put the scan tool on it. The fault code came across with a P1211.After checking the ICP I found oil coming through the center to the plug connector. I replaced the ICP sensor and cleared the code. I took it for another road test and nothing had changed. I limped it back to shop and this time put the scanner on it with the data stream. At an idle the ICP, IPR, % of duty cycle and the ICP voltage were all normal readings. I then took it out on the road. While on the road with the half open throttle I noticed the % duty cycle was going up and fast. At 53% the code popped on my scanner and on the dashboard. At 63% cycle duty I froze the frame on the scanner and have these results: Injector control duty cycle 63.1%
Injector control voltage 2.77 v
Injector control pressure 1979.59
I only have seen 2750 psi at the most on control pressure. Now my questions: What causes the injector duty cycle to peak so high and past the limit? I noticed when the check engine light came on noticed that the engine would miss for about 5 to 8 minutes, then smooth out. The Injector Control pressure at that time was at 490 psi. I’m ready to change the IPR control but I am wondering if there is a way to test this. Can a P1211 fault code come on if there is a loss of oil pressure down stream say in the injector area from a bad oring? There are no leaks outside from the lines or anything exterior that I can see. I don’t like to play guessing games so if anybody out there has any info on diagnosing this please let me know.
Mark

[jesilvas]

P1211 sets if ICP is 410 psi above or 280 psi below the desired pressure for 7.5 seconds.
It's setting off because it's getting an undesirable reading.
The IPRs can have the little connector on the back of them come loose and hopefully that's it.

[Mark Mi]

Thanks for the reply I checked that and also clean it .the spring lock was still latched.Is there a fitting in the head where I can test the pressure past the injectors to check leakage?

[jesilvas]

There are oil plugs at the ends of the HPO rails but other than that, idk how else to test that.

[Mark Mi]

If there was a leak in an injector oring I can see why the control pressure would be low.If the pressure would be high I would believe it would be a problem with the IPR. In reading up on this there is no set control pressure.Isn't the control pressure set by the ICP>PCM>ICR?How would I test this to find out if the pressure is to High or low.From what I know is what the Idle perameters are.

[jesilvas]

Yea. ICP reads pressure, PCM uses that and other things to determine the IPR.

[Mark Mi]

OK, so here is my question.How would you test the IPR?I have a feeling I'll be tearing the valve covers off by the weekend to check for injector orings

[jesilvas]

Don't know. I know it's at the bottom of the HPOP in the valley.

[Mark Mi]

I ordered the IPR.It wont be in till tuesday.Pulling the old one out wasnt that bad.I hope this is it. I dont like to guess but I rather replace the IPR then the injector orings.I'll let you know.
Thanks
Mark

[GulfcoastSD]

Im dealing with a similar problem so keep us posted. I already changed my cps and dont want to keep throwing parts at it