Coolant leak help
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Tuned
Joined: Oct 2021
Posts: 478
Likes: 194
they were replaced about a year from My overhaul.
I used IDS to command IPR to a specific position to maintain steady pressure when idling at full temp after driving. I see the ICP act steady +- 5psi then occasionally it will jump around +- 40 psi and the engine will stumble a bit then smooth out.
either the IPR is sticking when hot or the ICP sensor when hot is behaving erratically. It did this before the overhaul too when heat soaked. Usually it runs 640 psi and 23.1% IPR stock tune at hot idle. Never has had an issue hot starting.
i gusss I can unplug the ICP drive around and if I can’t re-create the issue it’s probably the sensor getting hot and reporting bad data which the FICM tries to compensate by adding or subtracting pulse width to maintain a target fuel volume.
I used IDS to command IPR to a specific position to maintain steady pressure when idling at full temp after driving. I see the ICP act steady +- 5psi then occasionally it will jump around +- 40 psi and the engine will stumble a bit then smooth out.
either the IPR is sticking when hot or the ICP sensor when hot is behaving erratically. It did this before the overhaul too when heat soaked. Usually it runs 640 psi and 23.1% IPR stock tune at hot idle. Never has had an issue hot starting.
i gusss I can unplug the ICP drive around and if I can’t re-create the issue it’s probably the sensor getting hot and reporting bad data which the FICM tries to compensate by adding or subtracting pulse width to maintain a target fuel volume.
Laughing Gas
Joined: Aug 2010
Posts: 1,049
Likes: 230
From: Amarillo, TX
Agree. If it wasn't so expensive, I would try the electronic clutch again, especially since I don't pull a 5th wheel anymore.
4th Gear
Joined: May 2025
Posts: 4
Likes: 0
My 2003 ZF6 truck has been doing this for awhile and I have been unable to figure it out too. I wanted to think IPR but when it runs inferred it is quite a bit better. Makes me wonder if it just resting in a different location at idle helps once it's hot. I still feel like it very faintly does it when running inferred driving down the road. Mine usually does it after longish drive, shut off and heat soak. Get back in with 150 to 160 degree temps and it will hiccup. Notice it pretty bad on a zf6 in a parking lot.
Thread Starter
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Tuned
Joined: Oct 2021
Posts: 478
Likes: 194
My 2003 ZF6 truck has been doing this for awhile and I have been unable to figure it out too. I wanted to think IPR but when it runs inferred it is quite a bit better. Makes me wonder if it just resting in a different location at idle helps once it's hot. I still feel like it very faintly does it when running inferred driving down the road. Mine usually does it after longish drive, shut off and heat soak. Get back in with 150 to 160 degree temps and it will hiccup. Notice it pretty bad on a zf6 in a parking lot.
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4th Gear
Joined: May 2025
Posts: 4
Likes: 0
yeah what I have observed is that it commands 640 psi at idle, it will be around 22-23% IPR to achieve that pressure. When it’s acts up after heat soak it will sit around 26-27% IPR but the ICP will jump around like: 640-670-630-690-640 causing the engine rpm to jump around a bit. When it’s not heat soaked it will be like 637-639-640-642-639. Much tighter regulation. I can’t tell if the ICP is jumping around due to the IPR moving or if the ICP sensor acts incorrectly when it’s hot. Chicken vs Egg. I would need to replicate problem, use IDS to command a fixed duty cycle and observe the ICP pressure/voltage
If it's means anything mine has a new Motorcraft ICP and pigtail and it made no change. Harness has been ohmed out and checked. Was beginning to wonder if it's some weird HPOP issue or something else in the oil system. I have seen several 03 04 owners experiencing the same thing and have never gotten an answer. Mine will usually not throw a code but it has thrown a 2287 once.
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Tuned
Joined: Oct 2021
Posts: 478
Likes: 194
If it's means anything mine has a new Motorcraft ICP and pigtail and it made no change. Harness has been ohmed out and checked. Was beginning to wonder if it's some weird HPOP issue or something else in the oil system. I have seen several 03 04 owners experiencing the same thing and have never gotten an answer. Mine will usually not throw a code but it has thrown a 2287 once.
match the desired ICP. Too much or too little gain? All I can say is it only happens after the engine gets heat soaked like on a long highway drive or idling with AC on during summer for extended periods of time. Usually it’s high speed RPM operations for long times like 2200-2300+ rpm for 30 min or more. I thought maybe it was aeration with the oil
4th Gear
Joined: May 2025
Posts: 4
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I have a brand new engine harness, ICP, and IPR. I think it might be the programming. Sometimes it seems to get stuck in an oscillating loop. Maybe it’s the PID loop that drives the IPR position to
match the desired ICP. Too much or too little gain? All I can say is it only happens after the engine gets heat soaked like on a long highway drive or idling with AC on during summer for extended periods of time. Usually it’s high speed RPM operations for long times like 2200-2300+ rpm for 30 min or more. I thought maybe it was aeration with the oil
match the desired ICP. Too much or too little gain? All I can say is it only happens after the engine gets heat soaked like on a long highway drive or idling with AC on during summer for extended periods of time. Usually it’s high speed RPM operations for long times like 2200-2300+ rpm for 30 min or more. I thought maybe it was aeration with the oil
Hotshot
Joined: Dec 2014
Posts: 17,827
Likes: 3,111
From: Jersey Shore
When my truck had this problem when it was new, and it did so often, I ran the "self test" (I had IDS at the time, but other tools may be able to do this). It never did it again in 22 years.
4th Gear
Joined: May 2025
Posts: 4
Likes: 0
I have a brand new engine harness, ICP, and IPR. I think it might be the programming. Sometimes it seems to get stuck in an oscillating loop. Maybe it’s the PID loop that drives the IPR position to
match the desired ICP. Too much or too little gain? All I can say is it only happens after the engine gets heat soaked like on a long highway drive or idling with AC on during summer for extended periods of time. Usually it’s high speed RPM operations for long times like 2200-2300+ rpm for 30 min or more. I thought maybe it was aeration with the oil
match the desired ICP. Too much or too little gain? All I can say is it only happens after the engine gets heat soaked like on a long highway drive or idling with AC on during summer for extended periods of time. Usually it’s high speed RPM operations for long times like 2200-2300+ rpm for 30 min or more. I thought maybe it was aeration with the oil
I think I finally figured it out. I got eric at ID speed to get me a non inferred ebp 75hp tow tune. Has not missed a beat yet. ICP has been rock solid for 1000 miles now. If you need more info PM me. But this fixed mine.
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