What would cause this? - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 12-23-2009, 02:33 PM Thread Starter
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What would cause this?

I'm slowly learning more about my truck, and am hoping to pinpoint the issue.

I spent the money on a hydraulic hose, and analog gauge to hook up to the heads. I also have access to the Auto Enginuity software. I was able to take a ride in my truck today to get some data. While I had the AE software going, I was also monitoring the gauge (100psi-4000psi). Here's a screen shot of the AE readings.

The truck has been having P1211 code problems (doesn't run bad after code is thrown). It will happen when going up a hill, or when flooring it around 3000rpms and 50mph. I tried 4 times today to get the code to throw, and it would not. All the high-speed passes are in red on the left. What has me perplexed is the steady cruising on the right. Take note to the area highlighted in blue. The IPR duty cycle is way high (notice it steadily climbs over a short time period, and the engine speed and pressure seems to remain constant. Once it peaks out at 50% for 4 seconds, it drops to normal.

The truck has a new ICP, HPOP. It supposedly has a new IPR, but it looks like its been on there for a while. Could this be an electrical problem?

The truck does run rough for a few seconds if you shut it off, and restart it while it is hot. If I unplug the ICP, it does not do this.


1996 F350 CCLB: ZF5 with Valair clutch, Rosewood stage 1 injectors, T500 HPOP, PHP tunes, Tymar intake, 5" straight exhaust.
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post #2 of 4 Old 01-30-2010, 02:30 PM
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i think you hpop should be putin out more psi then that,ive heard it should maintain 2800 psi at wot. heres a bump though

96 F250 460-auto-ext.cab-long box-4.10-152k-10mpg all day running or not.....

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post #3 of 4 Old 01-31-2010, 08:37 PM
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Is the IPR leaking? If your running a 15* pump you pressure seems OK and consistent. Thats not to say that a 17* or better wouldn't improve it. I would agree the other issue is electrical.

Pete in San Ramon

2005 F250 6.0 4X4 Lariat CC short bed (stock)

1997 F250 7.3 4X4 XLT Reg. cab (stock)

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post #4 of 4 Old 02-01-2010, 08:06 AM
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hope this helps according to this diagnostic chart ford left in my truck heres some info

that code is an ICP pressure above/below desired. probable causes: IPR valve failed,stuck, or shortened to ground

08 Dodge 2500 QCSB, G56 Efi Live, fully deleted, AFE intake, South Bend DD 3250
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