Makes 350 PSI with the IPR unplugged - Ford Powerstroke Diesel Forum
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Old 07-05-2014, 11:28 AM
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Makes 350 PSI with the IPR unplugged

Hey guys, my truck is making 350 PSI when the IPR is unplugged and well over 3000 when is is plugged in. I have a high pressure gauge hooked up to the ICP to monitor this. When the IPR is plugged in and it makes the 3000+ PSI the truck does not start. Any ideas on what's causing this?
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Old 07-05-2014, 11:37 AM
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Can we get a little more background on this? Does it start when your IPR isn't hooked up?
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Old 07-05-2014, 01:12 PM
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The truck initially had a stall when hot. This was a problem that I could not figure out since there weren't any leaks in the HPO system. I tested it with the air test through the IPR and by doing a high pressure test by hooking up a gauge to the ICP while the truck is running. Now it won't start and pressure builds to 3000+ PSI while cranking with the IPR plugged in and builds 350 PSI with it unplugged.
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Old 07-05-2014, 02:42 PM
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Sounds like a bad ICP based only on your readings. It should show 500psi unplugged. What year is your truck?
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Old 07-05-2014, 03:04 PM
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I'm monitoring the pressure using a high pressure gauge that's in place of the ICP. So I'm getting actual readings. The gauge goes up to 3000 PSI and with IPR connected it actually goes to 4000+. Can't really tell because it's maxing out the gauge.
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Old 07-05-2014, 04:48 PM
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sounds like your hpop is making plenty of pressure and not leaking out of the high pressure oil system.
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Old 07-05-2014, 09:02 PM
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Are you makeing sync? Sounds like your oil system is ok but not shure getting your readings from the icp port with a gauge and useing the ipr that way.
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Old 07-06-2014, 10:05 AM
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Sync is for the camshaft and crankshaft sensors, it has very little to do with this situation. By unhooking the ICP it will just default the IPR to be open at 32% if I remember correctly. Still the engine should not develop 3000-4000 or more PSI while cranking, you only need 450 to start. I think a normal system will develop 900 max at crank and idle at 600.
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Old 07-06-2014, 09:57 PM
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A normal system will develop 3000 psi after the IPR is fully closed while cranking.

Check DTC's, check Sync, check fuel, run a buzz test. You seem to have plenty of ICP.
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