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Old 09-05-2013, 12:24 PM
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Low pressure high duty cycle.

Hellomand thanks in advance for any help! I have a 2003 7.3 excursion 4x4 with 74300 miles. At about 68-70K it developed a oil and fuel leak. I resealed the HPOP and fuel bowl. About a week later the CEL came on with a P1211,1212code. It ran fine and everything appeared to be w/i perimeters so after some research i figured id just reflash the computer( superchip came with the truck and in tow safe mode) couldnt find the cord but it drove fine so I didn't do it until recently and had no change. A few months ago after towing the boat it would barely,make it up the hill. Duty cycle pretty much hit 64.7 % and stayed there pressure never rose above 1800. It is totally gutless under load or up hill and dies under braking while going down hill. So,far ive- Resealed the fuel bowl,HPOP. New injector orings,new ipr,icp,cps.im getting low pressure- less than 1800 psi according to the icp sensor( new and old) , and a very high duty cycle from the ipr 64.7%, after replacing the ipr the pressure would not build above 1800 whereas the old unit was giving me at least 2600-2800. I cannot tow the boat, it has very long 10-20+second 'crank times it has died about a dozen times but only while going downhill under a braking application. Sometime it starts fine other times it is a very very long crank, it is not a consistant issue but its usually when warm. Oil has less than 1000 miles on it 15-40 delo with new fuel and oil filter. No visible oil leaks. I finally had to take it to a mechanic and they said that fuel pressure was 68-75 with spikes to 120. FRP in fuel bowl does not appear to be side loaded or have aftermarket springs/ shim. How do I get my truck back to functional shape
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Old 09-10-2013, 03:10 PM
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Anyone? I've already spent close to a grand the last thing left is the hpop. But I'd rather not have to replace it if its just going to be a trouble shooting hunt.
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Old 09-10-2013, 04:44 PM
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Pull your ICP plug and then see what your HPOP pressure is. It should default to max. If your not achieving this then your HPOP is indeed bad.

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Old 09-11-2013, 12:28 PM
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Ok, I'll give this a try. Just to confirm tho the ICP? As I understood it the icp measures pressure in the passenger head and if unplugged will send the pcm into default mode of 750ish. The ipr regulates the pressure and I thought if that was unplugged it would dump pressure as it is normally open. I'm willing to try anything as all diagnostic test are coming back with no results. I may have forgotten to mention that I can pull the 1211 code but it was doing this before When i was still building pressures in excess of 2800, ( 7.3 max is 3k while the 6.0 is 3500). I will be able to pull the plug tonight and ill let you know what happens. Thanks for the help
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Old 09-11-2013, 03:08 PM
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Quote:
Originally Posted by Slayvok View Post
Ok, I'll give this a try. Just to confirm tho the ICP? As I understood it the icp measures pressure in the passenger head and if unplugged will send the pcm into default mode of 750ish. The ipr regulates the pressure and I thought if that was unplugged it would dump pressure as it is normally open. I'm willing to try anything as all diagnostic test are coming back with no results. I may have forgotten to mention that I can pull the 1211 code but it was doing this before When i was still building pressures in excess of 2800, ( 7.3 max is 3k while the 6.0 is 3500). I will be able to pull the plug tonight and ill let you know what happens. Thanks for the help
Pulling the ICP should make it go to 2000, but that number is relative since the ICP is unplugged and no longer read actual pressure. PCM has a set voltage it tell the IPR to open 75% or something. So roughly 2k psi or so.
Max psi is not 3k for a 7.3. My 15* HPOP hits 32-3500 all the time. Got the AE data logs to prove it.

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