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I am currently experiencing an issue with my 2002 F350 where I see a check engine light with code B1211 always accompanied with B1352 for some reason. When this condition occurs the Torque pro app tells me my HPOP pressure at idle is between 1000 - 1030 roughly and the duty cycle is always 4.6 steady.
This problem started with a check engine light and rough running truck that would occasionally die I ordered a new IPR valve and a new ICP sensor hoping the issue wouldn't deteriorate before the parts arrived. At this point I had the fallowing codes, B1352, B1211 and P1280. Over the course of 2 days the truck began to run worse and worse until it was shuddering and shaking the whole truck to the point it was barley running. I went to Ford and picked up an IPR which after installing I noticed the problem was gone. Then the next day on the way to work the problem came back. I did notice that there was some damage to the wiring going to the IPR which I patched up as best I could before the pig tail I ordered comes in.
At this point I went back to the dealership and got a ICP sensor which after installing appeared to solve my problem instantly....until the end of the day when the check engine light came on. After the new ICP sensor when the check engine light comes one the truck would run a little bit rough at idle, but the truck would not stall, shudder or shake like before. From this point forward I only see the fallowing codes B1211 and the B1352 code. I do not understand why these codes always appear together.
In the vehicles current condition When things are running better and there is no check engine light present my HPOP pressure reads 740 to 770 with a steady duty cycle of 4.6 at idle. When the check engine light is on and the engine is not running quite right the pressure is up around 1000 - 1030 at idle and at a steady 4.6 duty cycle as i mentioned before. In a WOT situation when no check engine light is present my HPOP pressure is between 2813 - 2850 with the duty cycle always either 40 or 41. when the check engine light is on I measured HPOP pressure between 2787 - 2854 with the duty cycle always either 40 or 41.
If any one has any insight into how to repair this problem or better diagnose it I would greatly appreciate the help, this truck is my welding rig and I need it to make it to the job site 6 days a week and do not have the option to drop it off at a shop.
Last edited by Crusty_Rusty7.3; Apr 10, 2022 at 11:58 AM.
The wiring to the IPR or ICP could be the culprit. If I understood you correctly you are still waiting for the pig tail to come in? Did you already replace the ICP?
I didn't find any damage to the ICP wiering but I will dig into it a bit further tonight
WHat kind of damage did you see on n the IPR wiring? Burnt or melted wires close to the plug? Do you have a chip or programmer on the truck? I am assuming you are seeing 740 ICP PSI upon start up when engine is cold? Those numbers would seem high if that is on a warm engine with stock tuning. I would recommend using the forscan app to read codes, torque pro seems to do well for monitoring gauges but forscan is much better for reading codes. Have you tried running the truck with the ICP sensor unplugged? I think the default value for ICP when it is unplugged is around what you are seeing.
In regards to the IPR wiring I do in fact see melted wires close to the plug. The truck is bone stock with no tune and it has never had a tune. I will wait a few hours for the truck to cool off and see what numbers I get on a cold start. I had the truck out this morning for a few hours and got an oil change just to see if that would change any thing (it didn't) on a hot start up today I am seeing my HPOP pressure at around 870 and 4.6 duty cycle. I tried unplugging the ICP while the truck was running after taking the numbers I just mentioned on a hot start up. After unplugging the ICP I saw my HPOP pressure drop to 729 and the duty cycle raise to 14.3, the truck also smoothed out a bit when I did this.
I downloaded FORscan and these are the codes I am seeing. B1352, P1211 and P1832.
Thank you for your help thus far. It is appreciated
I agree the values I am seeing do not make sense how ever I have not had to dig this deep into a 7.3 ever and I am far from an expert. On a cold start up this morning I see the HPOP pressure at about 1066 PSI with a duty cycle of 22.8 when the engine is running at idle. over the course of about a minute the HPOP pressure drops to about 1000 PSI and the Duty cycle drops to 4.6 I am still waiting for the pig tail to come in but I will post an update once I have repaired the wiring
If the truck runs well when cold but fails when warmed up that can point to a failing IPR. Well the solenoid part of it anyway. You can check the resistance of the coil, should be around 10.5 ohms. Be careful with the tin nut that retains it, it's not very strong.
I changed the Pig tail going to the IPR today and the issue I am experiencing did not change at all unfortunately. The IPR Valve I installed Is a Brand new Ford Part, how ever I plan on taking it out now, inspecting for debris and testing the coil.
I changed the Pig tail going to the IPR today and the issue I am experiencing did not change at all unfortunately. The IPR Valve I installed Is a Brand new Ford Part, how ever I plan on taking it out now, inspecting for debris and testing the coil.
This is a odd one, people have had brand new parts fail right out of the box. The part that is weird is your ICP seems awfully high and your IPR duty cycle seems awfully low. The other thing is you're not throwing any codes for either part. Since you replaced the pigtail on the IPR maybe try running the truck with the ICP unplugged again to see how it acts. Seems like being that your ICP is so high at idle the computer is telling the IPR to open all the way up to try and lower the ICP.
That is my thought process as well, maybe the IPR is jammed / stuck? Or perhaps there is some sort of a blockage in the HPO system? I'm just starting to wrap my head around the injection system on the 7.3, I am far from an expert. I can't quite seem to find anyone online that has experienced the same issue exactly. I wish I would have had Had duty cycle and IPC values before I started messing with things.
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