IPR valve resistance? - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 03-02-2013, 04:55 PM Thread Starter
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IPR valve resistance?

I suspect my IPR valve is stuck. can anyone tell me what that coil should be ohming out to? 12vdc coils i have had experienc w/ have 12-16 ohms resistance across the coil, mine has 5.1, seems low to me. also when i cycle power to it there isn't a click, no movement visible, nothing at all. sombody confirm my suspitions.
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post #2 of 6 Old 03-02-2013, 05:11 PM
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the solenoid internal to the IPR isn't what usually fails and when it does the PCM is pretty good about detecting that.

The IPR isn't commanded closed until there is sync from the cam and crank sensors during cranking.

-Matt

Ford Senior Master Tech

2015 F-250 XLT 6.7L

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post #3 of 6 Old 03-02-2013, 05:32 PM
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My spare (used) IPR is 5.5 ohms.

Of course your valve could still be stuck regardless of the resistance. Did you air it up and then supply voltage?

MikeB

2005 F-250 6.0L, crew cab, long bed 4x4
completed in 2011: STC update, new IPR, BPD EGR cooler, oil cooler rebuild, 6.4 banjo bolts, blue spring update, SCT X3, Insight CTS, 58V FICM, CCV Mod, DIY coolant filter (now gone), refinished turbo
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post #4 of 6 Old 03-02-2013, 05:40 PM Thread Starter
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no mike, i have the valve out. i know i have 12vdc at the valve when i turn the key on and i assumed this was a normaly closed proportional valve. i was thinking 12v was full open for starting. is that not right?
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post #5 of 6 Old 03-02-2013, 06:13 PM
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I think the IPR is always hot and the ground is switched by the PCM. I think it is a proportional controller. Although you sound like you may know this stuff better than me.

The IPR command PID is a percentage, so I assume it is a measure of the duty cycle that the valve is seeing. I.e., I think if the IPR PID is 85%, the valve is getting a 85 pulses out of a possible 100 pulses in a certain time period to close.

A high percentage IPR command means that the PCM is calling for more fuel pressure (by means of more HPOP oil pressure). When the IPR is seeing a low duty cycle (percentage) the valve is open and the excess oil from the HPOP is dumped to the crankcase.

Here is the wiring diagram for the IPR - note switched ground.

MikeBIPR valve resistance?-ipr.jpg

2005 F-250 6.0L, crew cab, long bed 4x4
completed in 2011: STC update, new IPR, BPD EGR cooler, oil cooler rebuild, 6.4 banjo bolts, blue spring update, SCT X3, Insight CTS, 58V FICM, CCV Mod, DIY coolant filter (now gone), refinished turbo
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post #6 of 6 Old 03-03-2013, 04:43 AM Thread Starter
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ground swithced

ok, that sounds like it is very likely good and correct info. thank-you for the schematic. i'll look that thing over after church today. i really think this vavle is mechanically failed but i hate to throw parts at anything without really troublshooting and testing the possibilities. thanks again for the help. ill let you know what i come up with.
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