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Old 02-04-2025, 07:04 PM   #1
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Join Date: Feb 2025
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1998 T444E tow truck keeps going into limp mode

trying to help a friend with a 1998 T444E international tow truck that after you run it for a few minutes it throws itself into limp mode and loses all power. The truck is flashed with powerhungry performance reflash as well but its set to stock power level at the moment. the dash shows a 333 fault code and when i scan it with the powerhungry fault scanner software i get MID 80 SPN A4 FMI 0A which as far as i can decipher is the 333 fault code. He has replaced the ICP, he also put a second ICP sensor in the other head and made a little extension harness just to deny or confirm that this sensor is the culprit. after that it didnt make a difference. the truck literally rolls coal even when on the stock setting when first running the truck.

i'll run through what it does more specifically. start the truck, pull out run out first gear it rolls coal but actually tries to get out of its own way. shift to second gear it starts to smoke again and about half way through the RPM range it it throws the light on the dash and loses all power. if i power cycle the key it goes back to normal till i try and run it even a little hard and right back into limp mode.

i have tried to use the live data part of the powerhungry software but it does not work right meaning it does not refresh fast enough to catch anything. i have tried to contact them about this but they dont answer me.

oh well, any ideas whats going and what i have to do to make this thing not go into limp mode? also bear with me, this is the first time i have ever worked on one of these.

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Old 02-05-2025, 07:45 AM   #2
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 20,048
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
try contacting Bill at Powerhungry.


the 333 code in and of itself means that the HPOP actual pressure is lower than the desired pressure.. the Live Data on my orion works.. make sure you have the latest software on your PC.


the values to look at are the ICP desired and the ICP actual...



here is how the system works..
this engine has 2 oil pumps.. Lube oil (dash gauge and oils the bearings).. and HPOP (high pressure).. the HPOP pressure is used to operate the injectors..



the ICP is a sensor that tells the computer how much oil pressure is in the high pressure rail..


there is a valve (IPR) that controls the amount of oil allowed t oflow thus controlling the pressure... the IPR is located in the engine valley (and on mine under the power steering pump and on the back of the HPOP).. its a royal pain to get to .. in the front of the engine valley against the timing cover.. on the bottom is the HPOP with the IPR on back. and on top of it is my power steering / hydroboost pump.. both items drive off the timing gears thus why they are up front in the valley.



its possible the IPR valve is sticking and not allowing enough flow.. or its possible the HPOP is worn out and cant provide the requested pressure and flow..



my 333 codes started when I used the factory Navistar software to tuen the power up .. i got an occasional code in hot weather (higher oil temp) if i had my foot buried in it for a long hill... i had a couple injectors dying so I installed a whole new set...


the new injectors being a slight performance upgrade caused me a lot of 333 codes.. I investigated and found at 210K mikles my HPOP was just no longer up to the task.. installed an adrenaline HPOP and no issues since.. even with my Orion cranked up.. (ive never used my Orion on 7.. my bus is so fast on 5 and will spin the tires in the rain on 6) that ive never used 7.. I typically run it in 4..



if you can get to it you can try taking the IPR out and cleaning it.. its tricky.. theres a thin metal nut on te back that comes off and you can slide off the solenoid... then you need an extra deep socket to get on and actually pull out the IPR valve itself..
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Old 02-05-2025, 10:05 AM   #3
Mini-Skoolie
 
Join Date: Dec 2024
Location: Kentucky
Posts: 60
Year: 1996
Coachwork: Thomas
Chassis: International 3800
Engine: dt466 (mechanical)
There are also plenty of places that high pressure oil can leak. See Diesel Tech Ron videos about the 7.3 on YouTube for some great diagnostic training.
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Old 02-05-2025, 05:14 PM   #4
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Quote:
Originally Posted by cadillackid View Post
try contacting Bill at Powerhungry.


the 333 code in and of itself means that the HPOP actual pressure is lower than the desired pressure.. the Live Data on my orion works.. make sure you have the latest software on your PC.


the values to look at are the ICP desired and the ICP actual...



here is how the system works..
this engine has 2 oil pumps.. Lube oil (dash gauge and oils the bearings).. and HPOP (high pressure).. the HPOP pressure is used to operate the injectors..



the ICP is a sensor that tells the computer how much oil pressure is in the high pressure rail..


there is a valve (IPR) that controls the amount of oil allowed t oflow thus controlling the pressure... the IPR is located in the engine valley (and on mine under the power steering pump and on the back of the HPOP).. its a royal pain to get to .. in the front of the engine valley against the timing cover.. on the bottom is the HPOP with the IPR on back. and on top of it is my power steering / hydroboost pump.. both items drive off the timing gears thus why they are up front in the valley.



its possible the IPR valve is sticking and not allowing enough flow.. or its possible the HPOP is worn out and cant provide the requested pressure and flow..



my 333 codes started when I used the factory Navistar software to tuen the power up .. i got an occasional code in hot weather (higher oil temp) if i had my foot buried in it for a long hill... i had a couple injectors dying so I installed a whole new set...


the new injectors being a slight performance upgrade caused me a lot of 333 codes.. I investigated and found at 210K mikles my HPOP was just no longer up to the task.. installed an adrenaline HPOP and no issues since.. even with my Orion cranked up.. (ive never used my Orion on 7.. my bus is so fast on 5 and will spin the tires in the rain on 6) that ive never used 7.. I typically run it in 4..



if you can get to it you can try taking the IPR out and cleaning it.. its tricky.. theres a thin metal nut on te back that comes off and you can slide off the solenoid... then you need an extra deep socket to get on and actually pull out the IPR valve itself..
Thank you for the in depth reply! i will have to contact them about the logging issue. anyhow i have him trying to replace the IPR now. pressure on the gauge on the dash looks good. through what i could get with the logging the actual injection and absolute pressure never leave 0. dont know if its an issue with the logging or if its actually the truck doing it.

i attached a screen grab from the one log i managed to grab.
Attached Thumbnails
Screenshot 2025-02-05 171148.jpg  
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Old 02-05-2025, 05:22 PM   #5
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Join Date: Feb 2025
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Here's the actual CSV data log that i took with the powerhungry logger. this was a 5 minute drive but you can clearly see that its not a 5 minute log. rename the file from TXT to CSV. this site doesnt allow CSV files to be uploaded.
Attached Files
File Type: txt 00004.txt (15.2 KB, 3 views)
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Old 02-05-2025, 07:40 PM   #6
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 20,048
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
definitely something wierd going on with the data.. ifthe ICP were truly readin g 0 all the time we wouldnt see the wild swings in the IPR cuty cycle.. wild swings are normal in reaction to the ICP.. also the boost is 0 and the oil pressure shows zero yet your dash gauge reads.. and it gets its data from the computer so the Orion is off somehow
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Old 02-05-2025, 07:58 PM   #7
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Quote:
Originally Posted by cadillackid View Post
definitely something wierd going on with the data.. ifthe ICP were truly readin g 0 all the time we wouldnt see the wild swings in the IPR cuty cycle.. wild swings are normal in reaction to the ICP.. also the boost is 0 and the oil pressure shows zero yet your dash gauge reads.. and it gets its data from the computer so the Orion is off somehow
i emailed bill at powerhungry performance and sent him the same CSV file. though like last time i probably wont hear from them for weeks if at all sadly. this sort of lack of support for a product is what i always seem to find in the performance automotive industry anymore. they got their money and its my problem now if their product doesnt function as advertised. basically a "kick rocks pal, i have your money already...."
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