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Old 10-15-2020, 01:00 PM   #41
Mini-Skoolie
 
Join Date: Oct 2019
Location: Northern Colorado
Posts: 29
Year: 1997
Coachwork: International
Chassis: 3400
Engine: T444E
Quote:
Originally Posted by cadillackid View Post
HPOP while cranking is 3000??? Ive never ever seen it that high.. it will run that why when the engine is running under full load.. the reason i ask about HPOP during cranking is if for some reason your HPOP is draining down.. its happened to some of the ford guys.. what results is 0 or very Low HPOP pressure whole cranking till its cranked enough to refill the reservoire and generate pressure.. the HPOP will read perfectly once the engine is started because the pump is good, IPR is likely good and ICP reading correctly..
I don't think the HPOP is draining down, because I can crank the engine for 30 seconds with nothing. My understanding is that the HPOP res would fill pretty quickly, even if it was drained down. Also, there's no oil in the valley, etc. I realise it could be draining into the low pressure side of the oil system, but if the pump was working, it would refilll the res while cranking. I can check the levels Saturday morning when I go to start it, although I don't know what it "should" look like.
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Old 10-15-2020, 07:17 PM   #42
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Join Date: Oct 2017
Location: Ashtabula, Ohio
Posts: 1,477
Year: 1996
Coachwork: Thomas
Chassis: International
Engine: T444E 7.3L
Do you have a working block heater? If so plug the bus in for a few hours and see if it starts. If it does it's time for injectors. Ran into this several times on Powerstroke diesels.
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Old 10-15-2020, 07:29 PM   #43
Mini-Skoolie
 
Join Date: Oct 2019
Location: Northern Colorado
Posts: 29
Year: 1997
Coachwork: International
Chassis: 3400
Engine: T444E
Quote:
Originally Posted by Johnny Mullet View Post
Do you have a working block heater? If so plug the bus in for a few hours and see if it starts. If it does it's time for injectors. Ran into this several times on Powerstroke diesels.
No block heater, but I've been having this problem since late summer, and on 100+ degree days. Doesn't seem to be correlated with heat at all. I'm re-doing gaskets on Saturday, and if that doesn't work... I dunno. Start replacing the common issue sensors randomly? Just kidding just kidding... except maybe not.
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Old 10-15-2020, 07:30 PM   #44
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 14,413
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
Quote:
Originally Posted by bachataBus View Post
I don't think the HPOP is draining down, because I can crank the engine for 30 seconds with nothing. My understanding is that the HPOP res would fill pretty quickly, even if it was drained down. Also, there's no oil in the valley, etc. I realise it could be draining into the low pressure side of the oil system, but if the pump was working, it would refilll the res while cranking. I can check the levels Saturday morning when I go to start it, although I don't know what it "should" look like.



it will refill while cranking but takes awhile to get enough oil to start the engine. . the ford guys have experienced this.. I only bring it up as an idea..
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Old 10-15-2020, 08:06 PM   #45
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Join Date: Oct 2017
Location: Ashtabula, Ohio
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Year: 1996
Coachwork: Thomas
Chassis: International
Engine: T444E 7.3L
The last 2 I had with this issue would not start even if it was 90 degrees outside. Plug it in for a couple hours and they start. Once started it would start right up every time until the next cold soak. How many miles on your engine?

I bet if you warm up the coolant or oil that engine will start.
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