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Old 07-09-2019, 03:35 PM   #11
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yep thats exactly it.. to see it register means signal.. almost starting to sound like the HPOP drained dry for some reason...
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Old 07-09-2019, 03:36 PM   #12
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I just wish I could find an actual Navistar publication stating the ECM needs to see 10-11 volts while cranking. I’m at 11.78v key out of the ignition. I’m at 9.85 while cranking at normal speed. I’m leaning towards this being my problem. The batteries have the Amps but not the Volts the ECM wants, since it doesn’t see Amps.
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Old 07-09-2019, 03:38 PM   #13
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yep thats exactly it.. to see it register means signal.. almost starting to sound like the HPOP drained dry for some reason...
With the amount of cranking done it would surely have refilled by now. I understand crank speed does not equal idle speed when it comes to the volume of oil and pressure but it most certainly should have filled up if it was just running the other day. Iíd also like to point out how the bus sat for about 4-5 months over winter without being started and fired right up when I tried in the spring time. No extended cranking or anything.
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Old 07-10-2019, 05:12 PM   #14
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Welp new batteries helped by did not fix the problem. The motor cranks strong, battery voltage remains in spec. I got a new troublecode: 335-System ICP unable to build pressure while cranking.

In anyone's experience does this instantly sound like a faulty IPR? Iíve tried cranking with and without the IPR Valve connected. Iím unable to test HPOP pressures with my current toolset. I would imagine Iíd get a move specific code if the HPOP was faulty however.

Any ideas???
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Old 07-10-2019, 09:51 PM   #15
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If anyone has any other ideas I could really use the help. Iím supposed to be taking a 3 day trip the last week of July so this couldnít come at a more inconvenient time
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Old 07-10-2019, 10:19 PM   #16
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If anyone has any other ideas I could really use the help. Iím supposed to be taking a 3 day trip the last week of July so this couldnít come at a more inconvenient time



I'm thinking fuel filter mainly to change but perhaps oil and air filters also.But definitely fuel filter first, it may go. I know you said it isn't old but when they are knew they can swallow lots of tank dirt that gets stirred up as you drive. Happened to me quite a bit till I knew this had to be regular maintenance along with regular fuel treatment additives. Not so bad when driven daily but sitting can gum things up anywhere in the system.



Hope she goes!


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Old 07-11-2019, 07:27 AM   #17
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insufficient ICP pressure can be a couple things..



1. HPOP ran out of oil.. might want to try filling it to see if it starts and runs at all..
2. IPR has closed fully and isnt allowing any HPOP flow.
3. bad HPOP
4. no Lube oil flow to HPOP for it to self fill.


here is a long justanswer thread on this issue..



ultimately you can check your HPOP reservoire level by taking out the engine oil temperature sensor.. if oil runs out its full, if not, then try filling it till oil runs out.. put the sensor back in and see if the bus starts..



https://www.justanswer.com/medium-an...-resevior.html
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Old 07-11-2019, 07:32 AM   #18
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I appreciate the help. I read that thread yesterday and it also provided insight. Today after work Iím going to pull that sensor and then check for engine oil pressure at the test port down low on the driver side. My oil pressure gauge doesnít move while cranking for extended periods only does itís normal sweep. Iím wondering if itís an oil delivery problem caused by a stuck regulator or cracked oil pickup tube or bad low pressure oil pump (!!). Because like I said it ran for a couple seconds then just quit on me and hasnít started since. Iíll report back my findings. Hopefully this can help someone else in the future.
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Old 07-11-2019, 09:56 AM   #19
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even at cranking spoeeds you should be able to see some LPOP pressure.. doesnt take much.. even just a couple PSI would be enough to put at least some oil in the HPOP where it would try to fire..



from the way I understand how the system works is that the computer wont be requiring much HPOP volume until it sees ICP pressure reach a threshold.. Id have to look in my navistar books. but I think its around 300 PSI or so..



hopefully it ends up being something simple!
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Old 08-12-2019, 05:32 PM   #20
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did you ever figure it out?
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