ICP psi to high to start? - Ford Powerstroke Diesel Forum
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Old 01-28-2013, 05:31 AM
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ICP psi to high to start?

My truck started leaking oil about a week ago. Got up yesterday and sprayed the engine w/ Purple Power and sprayed off with water hose so I could better see where leak might be. Started and drove about 5 miles to get motor to operating temp. to dry the motor. Everything was fine. Ran some errands and picked up a new serp. belt to replace later. Replaced belt and tried to start and no start. ICP psi was 0-35 cranking. Unplugged ICP started and ran but very rough/chuggy. Stopped the motor and plugged back in and as I was cranking noticed ICP psi was at 1000-1400 and no start. Got it started many times plugged/unplugged before I went to bed w/codes for ICP pressure too high and low ICP circuit. This am started and ran about 2 miles fine but ICP was 1100-1400 then no power. Unplugged and drove to work unplugged no problem. ICP sensor is only a month old and found the leak was coming from the ICP. Is ICP bad or is the oil leak the problem? Also will it hurt the motor to run w/o ICP plugged in. Thanks for any advice.
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Old 01-28-2013, 05:46 AM
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Repace the ICP also look at the plug closely for oil fouling replace pigtail if bad.
Odds are the resistance in the ICP is bad which can give false readings, is it leaking oil ?

About the leaving it unpluged, the PCM estimates the ICP pressure and it can run ok as long as the sensors it's running off of are close map ebp maf get it fixed asap.
Should not cause any problem as long as it's keeping up on injector pressure, may run bad at higher speeds though.

Last edited by mhatlen; 01-28-2013 at 05:51 AM.
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Old 01-28-2013, 07:30 AM
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Quote:
Originally Posted by mhatlen View Post
Repace the ICP also look at the plug closely for oil fouling replace pigtail if bad.
Odds are the resistance in the ICP is bad which can give false readings, is it leaking oil ?

About the leaving it unpluged, the PCM estimates the ICP pressure and it can run ok as long as the sensors it's running off of are close map ebp maf get it fixed asap.
Should not cause any problem as long as it's keeping up on injector pressure, may run bad at higher speeds though.
Thanks mhatlan. Went to Oreillys and swapped out ICP ( OReilly's is great, all you need is phone#), plugged it back in and started right up. Just wondering when the ICP went out a month ago my truck would not start even when I unplugged it. Also, yes the sensor was the source of the leak. When I took it off there was no o-ring.
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Old 01-28-2013, 10:05 AM
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Make sure you cleaned the pigtail you may take a look at the IPR wiring and check for chafing tape up if you see any wear points. It's driver side rear under turbo plate area.
Make sure it's all clean,some super clean and a pressure washer or garden hose will surely help, just watch were you spray high pressure, grease build up is not good with computer dependant engines.
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