2002 ford hard starting
Cargo Master
Joined: Sep 2007
Posts: 2,624
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From: OR and UT
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Welcome to FTE. No it's not the High Pressure Oil Pump.
Who told you that it was either the ICP or HPOP? Did they hook up a scanner to it and monitor ICP while cranking? Do you happen to recall what numbers they saw? Diagnosing this would really be easier with access to a good scanner, otherwise you just end up throwing parts at it.
What motor oil are you running? How many miles since it was last changed? Is the oil full? How about the fuel filter? If you remove the filter, is there any oil in the bottom of the fuel bowl? How many miles on the truck?
Next time you need to diagnose an ICP sensor, unplug it. If the truck starts with it unplugged, you need a new sensor. Too bad we can't test the IPR the same way.
Who told you that it was either the ICP or HPOP? Did they hook up a scanner to it and monitor ICP while cranking? Do you happen to recall what numbers they saw? Diagnosing this would really be easier with access to a good scanner, otherwise you just end up throwing parts at it.
What motor oil are you running? How many miles since it was last changed? Is the oil full? How about the fuel filter? If you remove the filter, is there any oil in the bottom of the fuel bowl? How many miles on the truck?
Next time you need to diagnose an ICP sensor, unplug it. If the truck starts with it unplugged, you need a new sensor. Too bad we can't test the IPR the same way.
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New User
Joined: Feb 2011
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The truck has 178,000 miles. When they scanned it, it showed the oil pressure was low but i dont remember the code numbers. Replaced fuel filter, changed oil about 3000 miles ago, and used rottela oil. What does the IPR sensor do and do you think it could be the IPR. Thanks for your input.
Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
The IPR is the valve that increases the pressure for the oil coming out of the HPOP. Was there any oil in the bottom of the fuel filter bowl when the filter was changed? Is there any oil in the bottom of the bowl now? Bad o-rings on the injectors can also cause problems starting.
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New User
Joined: Feb 2011
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dont think any oil in filter housing would it be possible to get in touch by phone i can give you my number
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Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
Sorry, lost my internet connection last night. It's better to keep this stuff in the forum so others can chime in or follow along to learn something. It's what makes forums like this work so well. If the fuel bowl had no oil in it then we'll skip over the leaking o-rings for now.
If you don't have access to a scanner that can monitor live data, can you get a hydraulic gauge capable of reading 3,000 psi or so? You can remove your ICP sensor and hook the gauge into the hole and monitor your high pressure oil while cranking that way. You need a minimum of 500 psi to fire the injectors.
Also make sure your HPOP reservoir has oil within 1" from the top.
If you don't have access to a scanner that can monitor live data, can you get a hydraulic gauge capable of reading 3,000 psi or so? You can remove your ICP sensor and hook the gauge into the hole and monitor your high pressure oil while cranking that way. You need a minimum of 500 psi to fire the injectors.
Also make sure your HPOP reservoir has oil within 1" from the top.
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New User
Joined: Feb 2011
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didnt get a chance to put a guage on but looked at fuel filter canister and no sign of oil started truck it started hard ran for about 10 to 15 min then died didnt want to start back up cranked on it a little bit maybe cam sensor
Cargo Master
Joined: Jun 2010
Posts: 2,771
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From: Louisiana
Did you happen to notice if your oil pressure gauge on the dash had come up? I recently had a problem cranking my truck in cold weather and it turned out to be my lpop, but I never hade any issue starting it once it was hot!
Post Fiend
Joined: May 2009
Posts: 5,470
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From: Pea Ridge, AR
It means you really need to get a scan tool on there to better find what is going on, you need to know what the duty cycle is at that pressure, which if I remember correctly staying at that PSI and not climbing is likely that the IPR is dumping oil back into resevoir, likely the o-rings on the regulator.
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Since a good scanner is expensive, you could try blocking off one head at a time (disconnect line from HPOP and cap off) and try cranking. If you can build 500 psi in one head the truck will start on only half the cylinders. If you can narrow it down to one side, it's time to pull the injectors on the bad side and replace the o-rings. Issues with the IPR are a possibility also. You can take apart and clean the IPR and replace the o-rings on that as well.