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I've been rebuilding a 7.3 for about 3 years slowl . Frame off. I've been having a hard start issue. I replaced the icp only. Mind you this hard start is in 85 degree temps. The glow plug relay is functioning regardless.
She cranks for about 10 seconds before starting.
Ipr when cranking goes to 64.84
icp sits at zero until a out 8 seconds in then spikes to 652psi and then 2700 psi and then it fires right up
I've check for leaks at all injectors with pressurized air and valve covers off, I've buzzed tested all injectors and they are good. No leaks externally anywhere.
Codes
P1280
P0113
P0603
Any help is appreciated. I'm trying to get this finished up.
Codes
P1280 ICP circuit out of range low
P0113 Intake air temp. sensor circuit, high input
P0603 Internal control module KAM error
P0603 likely just disconnected batteries, and should clear when you reset the DTCs.
How does the truck start if you disconnect the ICP first? PCM will use default values and ignore ICP sensor. See if it starts up quicker. If you monitor with Forscan Lite, ICP will show 724psi during cranking/idle.
What brand is the ICP? Motorcraft sensors are best for reliability
What is the condition of the IPR?
Is the oil full? How about the oil level in the HPOP reservoir just before you try to start? Should be sitting at the standpipe level, about 0.7" below the inspection port.
How is your cranking voltage and cranking rpm? 10.5V or better perferred, and about 150rpm or more.
Additional hard start info in the 'Troubleshooting' link in my signature below.
Codes
P1280 ICP circuit out of range low
P0113 Intake air temp. sensor circuit, high input
P0603 Internal control module KAM error
P0603 likely just disconnected batteries, and should clear when you reset the DTCs.
How does the truck start if you disconnect the ICP first? PCM will use default values and ignore ICP sensor. See if it starts up quicker. If you monitor with Forscan Lite, ICP will show 724psi during cranking/idle.
What brand is the ICP? Motorcraft sensors are best for reliability
What is the condition of the IPR?
Is the oil full? How about the oil level in the HPOP reservoir just before you try to start? Should be sitting at the standpipe level, about 0.7" below the inspection port.
How is your cranking voltage and cranking rpm? 10.5V or better perferred, and about 150rpm or more.
Additional hard start info in the 'Troubleshooting' link in my signature below.
Truck wIll fire almost immediately when icp disconnected. I did get 724 using forscan
Motorcraft sensor
Ipr seems to be functioning well, looks in good shape
Oil is fresh and full, resevoir is ful . I've checked all of these.
Voltage is good. 2 new batteries and has been on a charger as needed to maintain full charged.
I am leaning towards the hpop. I have no smoke out of exhaust. No external leaks anywhere. The icp sits at like 84 until its cranked for 8 to 9 seconds then it goes up and starts.
Truck wIll fire almost immediately when icp disconnected.
This tells me the ICP sensor is bad. I think your HPOP is good if it fires up right away with ICP sensor unplugged. HPOP rarely has an issue keeping up on a stock truck.
This tells me the ICP sensor is bad. I think your HPOP is good if it fires up right away with ICP sensor unplugged. HPOP rarely has an issue keeping up on a stock truck.
unplugging the icp tricks the pcm into seeing the necessary psi to start the vehicle. Regardless of the a total pressure, couldnt the pump be weak but this just masks it as an issue? Also thank you for responding.
It's true, the PCM assumes it has enough pressure to start, using a default value of 724psi, and commanding the IPR DC it needs assuming it will get more than the minimum 500psi starting ICP. Your HPOP is delivering at least 500psi if it starts immediately, so I don't think the HPOP is weak, at least for starting. I'd change out that ICP sensor to take care of that hard starting issue. The HPOP can then be evaluated for it's actual output if needed.
It's true, the PCM assumes it has enough pressure to start, using a default value of 724psi, and commanding the IPR DC it needs assuming it will get more than the minimum 500psi starting ICP. Your HPOP is delivering at least 500psi if it starts immediately, so I don't think the HPOP is weak, at least for starting. I'd change out that ICP sensor to take care of that hard starting issue. The HPOP can then be evaluated for it's actual output if needed.
The motorcraft icp thats in it is under 2 weeks old.
unplugging the icp tricks the pcm into seeing the necessary psi to start the vehicle. Regardless of the a total pressure, couldnt the pump be weak but this just masks it as an issue? Also thank you for responding.
the truck wouldn't fire right up if the pump is weak. Pcm isn't seeing the correct number because your icp is faulty. You will need a new motorcraft icp and also inspect the pigtail real good to make sure its not burnt up where the wires go into the plug. If the pigtail has been replaced you'll want to double check the connections as well
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The motorcraft icp thats in it is under 2 weeks old.
It would not be the first time a part was "bad out of stock" as we say in the airline business. Have seen it before with everything from brake temp sensors, air conditioning pressurization and shut off regulating valves up to $400,000 auto pilot computers.
Motorcraft parts are good but nothing is perfect. The suggestion to check the wire harness for the ICP is also a very good one.
It would not be the first time a part was "bad out of stock" as we say in the airline business. Have seen it before with everything from brake temp sensors, air conditioning pressurization and shut off regulating valves up to $400,000 auto pilot computers.
Motorcraft parts are good but nothing is perfect. The suggestion to check the wire harness for the ICP is also a very good one.
I soldered the new pigtail on when I did the sensor. I'll try to exchange the sensor and see. Could it still be the ipr as well?
I soldered the new pigtail on when I did the sensor. I'll try to exchange the sensor and see. Could it still be the ipr as well?
If there was no change when unplugging the icp I would look at the ipr but being that the truck runs good with the icp unplugged, I'm with the other guys on a faulty icp. Its rare that they are bad out of the box but I have heard of this happening more than once. Personally if the ipr is the original I would just replace it. Your just postponing the inevitable by keeping the original, at least its 1 more thing you don't have to worry about. I changed the ipr on both my trucks and even though there were no signs of failure, the trucks did run better after changing them out. Thats just my way of thinking, some may disagree with me but to each is own. They also sell ipr rebuild kits if you wanted to go that route. First and foremost I would swap the icp and see what happens.
I soldered the new pigtail on when I did the sensor.
Another member recently did the same and still had problems. Ended up opening the wire harness up further up and found that former owners had spliced wires before him and they were poorly done with wires exposed and splices loose. We also have seen wire insulation on these older vehicles just start breaking down from heat and age. Because the truck fires right up and runs good with the ICP disconnected I would keep chasing this until all possibilities are exhausted.
It's true, the PCM assumes it has enough pressure to start, using a default value of 724psi, and commanding the IPR DC it needs assuming it will get more than the minimum 500psi starting ICP. Your HPOP is delivering at least 500psi if it starts immediately, so I don't think the HPOP is weak, at least for starting. I'd change out that ICP sensor to take care of that hard starting issue. The HPOP can then be evaluated for it's actual output if needed.
Ok. So I had been cranking earlier prior to pulling the icp connector off. I've had it sitting for a few hours. Went back out with icp disconnected and it wont fire up right away. Back to leaning towards hpop
Ok. So I had been cranking earlier prior to pulling the icp connector off. I've had it sitting for a few hours. Went back out with icp disconnected and it wont fire up right away. Back to leaning towards hpop
that puts a different spin on things, did you just install injectors with new orings?
that puts a different spin on things, did you just install injectors with new orings?
No. Injectors were checked for leak. valve covers removed and pressure checke . No leak found. They dont loose any pressure through either head. Also were buzzed tested and sounded great.
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