please help truck won't start

[bigjeff]

i have a 2003 6.0 powerstroke was driving down the road and it was low on power and died at a stop light towed home replaced icp sensor icp harness ipr sensor and rebuilt turbo put back together was real hard to start then rpm's went up to 1000 then died again would not start back got a scan gauge 2 hooked it up ipr is 14.4% icp readings are bouncing around i have seen as much as 625psi while cranking and down to 425psi checked ficm it has 48 volts with key on and while cranking it is getting fuel to filter on top please help any suggestions

[dannyboy950]

You either have a leak somewhere in the HPOP system or your low pressure oil pump is not feeding enough oil to the HPOP feed sump. Have you noticed while watching live data while cranking, does it start off high and then slowly drop lower the longer you are cranking.

[bigjeff]

i have not noticed it to start high then drop off when i replaced icp it was out for a week would that be part of it

[bigjeff]

just tried to start truck again icp was 530psi then dropped to 395 then back to 514psi but the battery's are low on charge

[f250ghost]

The batteries might be an issue...but if your alternator is working properly it shouldn't die...it sounds to me like your HPOP is goin

[bigjeff]

just got truck to start the scan gauge said at 1800 rpm that i had 686psi then truck started to act funny looked at gauge and only had 485psi then the bottom fell out dropped to 345psi and died tried to start back only had 395 psi and was dropping but battery's were getting low again please help

[f250ghost]

I'm tellin ya man...in my opinion it's one of 2 things.

1) Alternator isn't working correctly
2) HPOP on it's way out

I dealt with both of those issues IN DEPTH on my 03 6.0 last year...

[dannyboy950]

Your next step in diagnostics would be to verify with mechanical gauges whether you are actually looseing oil pressure and where or is it just a bad sensor telling the PCM that it's looseing oil pressure. The PCM will believe whatever it is being told and will act accordingly.

[ModernDieselLegion]

Dude your hpop is dead. Get over it and get out the 8,10, 11,13,15,17,18,20,21 and 36mm. Have fun.

[HAM_RADIO_MAN]

Remove your IPR and look for glitter on the screen if you see any then you are shopping for a new IPR and a HPOP. You could try a new IPR first, but on an 03 I am leaning toward HPOP.