Symptoms of bad IPR and ICP sensor - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 02-12-2009, 12:09 AM   #1 (permalink)
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Symptoms of bad IPR and ICP sensor

can anyone tell me the symptoms of each and how to trouble shoot? I have the location of the IPR and will be cleaning it tomorrow and is there anyway to tell if the ICP is bad. BTW, my truck sputters about 3 miles after driving it and eventually stalls. might start up and run like crap. barely make it home stalling in the driveway.
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Old 02-12-2009, 04:18 AM   #2 (permalink)
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I know if you pull the ICP plug and it is covered in oil then it is bad or going bad.
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Old 02-12-2009, 10:43 AM   #3 (permalink)
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really need to location of the ICP sensor so i can fix it so if you have a picture/diagram that would be helpful PLEASE chime in
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Old 02-12-2009, 11:12 AM   #4 (permalink)
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Quote:
Originally Posted by edub32 View Post
really need to location of the ICP sensor so i can fix it so if you have a picture/diagram that would be helpful PLEASE chime in
Its on the L head ,,next to the lifting ring ,,three wire plug....
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Old 02-12-2009, 11:20 AM   #5 (permalink)
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You need to monitor your ICP and IPR Duty Cycle.

450-500 PSI of ICP to start, 550-750 to idle, and should ramp up into the 2,000's when getting on it.

IPR DC should be around 11 or 12% at idle and ramp up as well into the 20's or 30's as you get on it.
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Old 02-13-2009, 09:49 AM   #6 (permalink)
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hey when i replaced the icp sensor due to a code sayin it was bad i still experienced rough idle symptoms and when i unplug the icp sensor while its still running it will idle fine??

what could this indicate as being bad ?

there was also one more sensor down in the front of the hpop infront of the cooling fan that when itook it out it was filled with sludge dirt like stuff i cleaned it out but there was soo much of it? what do you think this could mean?
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Old 02-13-2009, 09:57 AM   #7 (permalink)
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That sounds like you Exhaust Backpressure Sensor. It can get plugged and sometimes the tube from the ex. manifold to the sensor gets plugged also.

I replaced my ICP also and my truck runs better when its unplugged. Looking forward to an answer.
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Old 02-13-2009, 10:00 AM   #8 (permalink)
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so is there a way to clean it or replace it and the tube the sensor seems like it went in the front of the hpop i looked at this a few weeks ago...

we just replaced a valve cover harness the other night the cleared up the power issues (one of the plugs was undone) but it still has the rough idle... so even though i unplug the icp sensor you still think that the back pressure sensor is plugged?
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Old 02-13-2009, 10:04 AM   #9 (permalink)
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Maybe we are on different things. EBP sensor is on front of engine between fan and front of block. Is this what you are talking about.
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Old 02-13-2009, 10:05 AM   #10 (permalink)
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There is a link around here with a pic and labels.
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Old 02-13-2009, 10:14 AM   #11 (permalink)
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yeah i just found it sounds like it could be an issue bec we replaced the icp on the driver side head bec it said it was bad if u unplug the icp it idles smooth how ever we did remove the ebp and looked at it it was completly clogged i just called my freind and i am gunna have him unplug it and let me know if it runs good again it sounds like it could be based on the symptoms i am seeing?

anything else u think might be wrong

thank you very much
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Old 02-26-2009, 09:16 PM   #12 (permalink)
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I'm having the same problem. Once the engine warms up I have a rough idle but it smooths out when I disconnect the ICP. I hooked up my programmer and it showed the injector pressure was low at idle once the truck had warmed up. I'm going to replace the IPR this weekend to see if that fixes the problem. If that doesn't work I may try replacing the injector o-rings. Somethings causing the idle pressure to be low - I figure it's either a sticking IPR or o-rings leaking.
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Old 02-28-2009, 01:57 PM   #13 (permalink)
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I replaced the IPR. Runs great now.
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Old 03-01-2009, 05:18 PM   #14 (permalink)
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My truck has the same symtoms, idles rough and when unplugging the ICP it smoothes out. I'm waiting on my ICP from ebay but sounds like this may not be the fix. How much $$ is the IPR and where is the best place to purchase?
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Old 03-01-2009, 09:08 PM   #15 (permalink)
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I picked up one on ebay (brand new/in box) for about $100.
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