I'm about to loose it - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 23 (permalink) Old 05-20-2017, 01:16 AM Thread Starter
FakënGrüvén
 
Join Date: Jan 2016
Location: Allen, TX
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Unhappy I'm about to loose it

Hello all!

I'm writing this new thread because I'm totally stumped.

My truck is a 96 7.3 335K miles. 5spd 2wd

I've been reading other threads and changing parts for about 2 months now.

My truck takes about 10 seconds of cranking to start. I get the error that says ICP not detected during crank
Runs OK when cold. When I gets to normal operating temperature, it runs rough, low fuel pressure, no power at low rpms, have to Rev the engine to 1200 rpms for it to move. If I turn it off, it won't even start, I have to let it sit for a while for it to start again.

It has a new HPOP, ICP, IPR, FUEL PUMP(twice), valve cover gaskets and harness, injector o rings, oil rail crossover, oil reservoir is full, glow plugs and relay
When I unplug the ICP still no start.
Buzz test pass
Normal blowby

Here are some numbers
Warm engine
637 RPMS, ICP voltage 0.67, ICP pressure 405 psi, IPR duty 70.6 (why?.)
1100 RPMS, ICP voltage 1.19, ICP pressure 1013 psi, IPR duty 53.1

Cold engine
620 RPMS, ICP voltage 0.64, ICP pressure 405 psi, IPR duty 41
1100 RPMS, ICP voltage 0.94, ICP pressure 810 psi, IPR duty 28

The HPOP, ICP and IPR, are from Pensacola Diesel. Are they good? All the other parts are from dieselorings.com

What now??

Thank you!!

96 Powerstroke 350 Crew...My 1st Diesel
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post #2 of 23 (permalink) Old 05-20-2017, 01:42 AM
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Re: I'm about to loose it

IPR duty being that high could be your problem. Low fuel pressure i'd be concerned with too, no reason to loose fuel pressure as its an entirely mechanical system (unless you converter to e-fuel?)

What i did to diagnose a bad IPR on my truck was go to oreilly's and buy one, they call it a "fuel pressure regulator" not an IPR though. If it doesn't fix your problem, pull it back out, clean it, and return it.

Make sure to check wiring on the IPR too, and the entire fuel bowl harness. Check for burnt pins or oil in the connector.


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1996 Cali F350 CCFB, 7.3 PSD, 2wd SAS, w/ 380,000 miles.
New Motor at 352,000, DieselSite Legendary Trans at 356,000 and many more
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post #3 of 23 (permalink) Old 05-20-2017, 02:27 AM Thread Starter
FakënGrüvén
 
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Re: I'm about to loose it

Thank for the reply.

I forgot to mention, fuel bowl wiring is new also. You think bad new IPR?

96 Powerstroke 350 Crew...My 1st Diesel
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post #4 of 23 (permalink) Old 05-20-2017, 03:28 AM
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Re: I'm about to loose it

Wouldn't be the first time, not sure what else would cause duty cycle to be that high though. My truck at idle, when warm, the duty cycle is about 4-6%, and about 12% while cruising.


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New Motor at 352,000, DieselSite Legendary Trans at 356,000 and many more
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post #5 of 23 (permalink) Old 05-20-2017, 03:54 PM
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Re: I'm about to loose it

How old is the oil?
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post #6 of 23 (permalink) Old 05-20-2017, 04:04 PM Thread Starter
FakënGrüvén
 
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Re: I'm about to loose it

Quote:
Originally Posted by madpogue View Post
How old is the oil?

New oil, Rotella T6.


I have a spare IPR, and its the easiest to change, I will try that.

Thanks all.

96 Powerstroke 350 Crew...My 1st Diesel
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post #7 of 23 (permalink) Old 05-20-2017, 08:02 PM Thread Starter
FakënGrüvén
 
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Re: I'm about to loose it

I also forgot to mention this

During cold crank, ICP pressure stays at 0 for about 8 seconds, IPR duty 70%, then the SEL comes on, ICP pressure jumps to 800-1100 and it starts

During hot crank, ICP pressure 200, IPR 50, then ICP jumps to 405 and it starts.


Thank you.

96 Powerstroke 350 Crew...My 1st Diesel
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post #8 of 23 (permalink) Old 05-20-2017, 09:24 PM
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Re: I'm about to loose it

Have you scanned for codes?
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post #9 of 23 (permalink) Old 05-20-2017, 11:13 PM
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Re: I'm about to loose it

This could very well be an electrical issue. Injector pulse width essentially is on time per degree of camshaft rotation. The HEUI system uses high pressure oil as a hydraulic medium but also use electric pulses... you can check continuity, resistance, and do a voltage drop of the HOT harness and see if the numbers are what they should be

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post #10 of 23 (permalink) Old 05-20-2017, 11:26 PM
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Re: I'm about to loose it

IPR harness**

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