Icp sensor question - Ford Powerstroke Diesel Forum

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post #1 of 20 Old 04-17-2013, 10:15 AM Thread Starter
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Icp sensor question

Bear with me, on the drivers side valve cover...the icp sensor, I'm fairly sure that's the acronym..if its running and I disconnect it, it should die? Correct or no? It's all full of oil, and when I disconnect it while the rig is running there is no change in the idle at all? What's this tell a person?


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post #2 of 20 Old 04-17-2013, 10:25 AM
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The ICP is tapped into the HPO rail.
Oil in the connector is a sign of the sensor taking a dump.
When you unplug the sensor the truck Shouldn't die. The PCM gives the IPR a default setting

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post #3 of 20 Old 04-17-2013, 11:56 AM
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As stated, the ICP sensor is in the drivers side oil rail towards the front of the engine. If there is oil in the connector, replace the sensor. If you unplug the ICP sensor while the truck is running, and nothing changes at all, then your sensor is bad. If the sensor was good and functioning, you should hear a change in the idle because the PCM will bump up ICP.

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post #4 of 20 Old 04-17-2013, 04:21 PM
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I saw this post and have to piggy back on it, sorry. I was checking my icp a couple weeks ago and with the truck running I unplugged the sensor. Well, the engine shut down. So, you're saying this shouldn't happen? Is my icp going bad? Thanks for any advice and apologies to the op!


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post #5 of 20 Old 04-17-2013, 06:09 PM
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Because im bored im going to write this bad boy up.

The icp sensor reads the amount of pressure the HP pump is sending to the heads and he ICP relays the message to the ECM which in return controls the IPR valve ground side circuit with a pulse width modulated signal. depending on the signal the IPR will adjust the amount of oil that is dumped from the pumps output pressure.

If your truck will not start always try to unplug the ICP first just in case the sensor is sending a biased signal. If the truck RLS and you unplug the sensor and idle quality does not change the sensor is bad at that point the ECM is using default settings to run the engine. And as stated above by Justin if you unplug it when its a good sensor it will start to RLS
If you have oil in the connector replace the sensor, the diaphragm in the sensor has failed.

What ford does may differ just a smidge on some things but this is what I was taught by International on all of their engines and systems

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post #6 of 20 Old 04-18-2013, 06:11 AM
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Quote:
Originally Posted by Va7.3L View Post
I saw this post and have to piggy back on it, sorry. I was checking my icp a couple weeks ago and with the truck running I unplugged the sensor. Well, the engine shut down. So, you're saying this shouldn't happen? Is my icp going bad? Thanks for any advice and apologies to the op!
Are you sure you're unplugging the right sensor? The ICP should not do that, but the IPR will...
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post #7 of 20 Old 04-18-2013, 06:18 AM
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What are the symptoms of the ICP going bad, besides oil in it?



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post #8 of 20 Old 04-18-2013, 06:22 AM
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rough idle and/or bad mpg's if it went and the pcm is imputting default value. or no start

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post #9 of 20 Old 04-18-2013, 06:24 AM Thread Starter
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Yeah, that's all confirming what I thought. I noticed it had oil all over it, decided to fire it up and see if idle changed. No change at all...just the CEL, what can I expect to notice with the new sensor? Or is it just to do with startup?


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post #10 of 20 Old 04-18-2013, 07:23 AM
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Quote:
Originally Posted by NoRalPh View Post
Are you sure you're unplugging the right sensor? The ICP should not do that, but the IPR will...
Yes, I'm sure its the right one. Tried it again this morning and the engine stumbled like it was gonna shut off then just kept running like it was with the sensor plugged in.


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