View Poll Results: Miles at time of ICP failure, and were you running a stock HPOP at the time?
> 400,000 miles
0
0%
Reman, Upgraded, or Twin HPOPs at time of failure
0
0%
Multiple Choice Poll. Voters: 40. You may not vote on this poll
POLL: ICP Sensor Failures
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 27
From: Mesa AZ
No. One is a regulator and the other is a sensor. In other words....one does work and the other measures it.
Here is a good write up that explains how the oil system works.
Here is a good write up that explains how the oil system works.
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 27
From: Mesa AZ
Effectively this is correct. However, technically speaking the ICP sensor measures the high pressure oil and reports that info to the PCM. The PCM controls the IPR via duty cycle voltage. If the ICP sensor fails, the PCM can still adjust the IPR to keep the engine running as long as other systems are functioning properly. It uses inferred values for ICP based off a preloaded table.
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Hotshot
Joined: Nov 2006
Posts: 11,288
Likes: 269
From: North of Greenville
Evidently, when Benjamin ran his oil too low, which was coincidental with his ICP failing, he must have ingested some air into the system due to low oil flow from the low pressure oil pump. He has run the truck a bit, and everything is now running smoothly.
Posting Guru
Joined: Aug 2009
Posts: 1,025
Likes: 0
From: ellensburg
Sorry for the double post.
While on the subject of ipr.....how common does it get stuck open? I just changed injectors and am thinking my IPR might have gotten stuck open due to it being drained of oil
While on the subject of ipr.....how common does it get stuck open? I just changed injectors and am thinking my IPR might have gotten stuck open due to it being drained of oil
Posting Guru
Joined: Aug 2010
Posts: 1,002
Likes: 1
Related question. Benjamin just put in his new ICP sensor and the truck started up fine, but has a sort of lopey idle at the moment. He did not disconnect the HPOP lines, so I would not expect there to be any air in the system, or can it get air just from changing the sensor and require driving it around a bit to expel the air?
Edit:
I changed mine around 170K miles. I was getting a 1280 code, I had no oil in the connector, I replaced it, It seemed to work fine for a month or so, then the 1280 code came back. I replaced the IPR, I still get the 1280 code, I now have spares.... I have replaced the pigtail on the ICP wiring too. I still get a SES light and a 1280 code some times... Now I just ignore it and drive the truck. If she fires and moves under her own power, off to work I go.
Last edited by Nsaan; Jan 5, 2012 at 02:10 PM. Reason: added info.
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
PCM - IPR - ICP interaction:
ICP pic is of the older style with 5/8" hex. Newer style has a 1 1/8" hex.
ICP pic is of the older style with 5/8" hex. Newer style has a 1 1/8" hex.
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Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
I probably voted wrong. I changed mine around 330k because it had a little oil in the connector. The new one didn't make it run any better and soon got the same small amount of oil. I loaned my old one to a local guy who had ICP issues, and last I heard he's still running it. So technically I guess it's never failed, but I have no idea the current mileage on it. Should be less than 400k though.
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Hotshot
Joined: Nov 2006
Posts: 11,288
Likes: 269
From: North of Greenville
Perhaps the sensor failure is a function of how much oil flow there is through the seals in the sensor?
Benjamin's oil leak had just gotten really bad, and we're still not yet sure if it was simply the ICP or if he has other leaks elsewhere. He'll be washing the engine bay tonight and letting it sit until we can dig in and proactively (or necessarily) replace all the HPOP o-rings and non-serviceable plug on Saturday.
Benjamin's oil leak had just gotten really bad, and we're still not yet sure if it was simply the ICP or if he has other leaks elsewhere. He'll be washing the engine bay tonight and letting it sit until we can dig in and proactively (or necessarily) replace all the HPOP o-rings and non-serviceable plug on Saturday.
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Rubicante
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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