Truck cuts off like you turned off the key - Ford Powerstroke Diesel Forum
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Old 07-22-2013, 03:57 AM
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Truck cuts off like you turned off the key

I have looked at tons of posts on stalling but have tested everything I have read about. Need next steps.

2004 F350 6.0. Engine sticker says its a 2006.

Truck will start fine like normal. Run about three minutes then cut off cold. No smoke no sputter no miss nothing. Acts like the key was switched off. Cranks good but won't start. Let it sit an hour or so and it starts up perfect and again stalls after a few minutes.

Tested Fuel pressure 48 psi
Tested FICM 48 volts steady cranking and running
Put pressure gauge in ips port and it measures a rock steady 1000 psi at idle, 300 psi cranking with key off and goes up to 2000 with key on during no start condition. That leads me to believe the IPR is working.

Performed balloon test and don't see any issues with injectors.

Don't see any chaffed wires but hard to see harness in some areas.

The batteries are new, alternator new, Fresh oil and filter, Good fuel filters.

I don't have a way to monitor IPR percent. I only have a code reader truck is showing no codes.

Stumped, Please help a newbie out!
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Old 07-22-2013, 04:23 AM
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Hmmm only thing I don't think you looked at is the icp but ur going to need a way to check it
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Old 07-22-2013, 04:35 AM
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Thanks for the quick reply!

Sorry forgot to mention the ICP. I tested the ICP and it measures up to 2 volts on my meter. Also tried to start it with the ICP unplugged and no dice.
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Old 07-22-2013, 06:02 AM
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What kinda scanner are u using possible sct fitting or leak from dummy plugs
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Old 07-22-2013, 06:18 AM
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I am confused more than normal. Is your ICP more than 0.8v (500 psi) during crank or not? If you get 2v and it is real, you have enough oil pressure for start. 1000 psi at idle is high, it should be 600-800. Since you get a cold start and not warm, it is likely a HPO (300 psi) or FICM issue.

What are you showing when it WONT start? Please list all the parameters you have per system.
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Old 07-22-2013, 06:36 AM
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I measure the ICP voltage with a multimeter. The voltage goes up to 2 volts or so when cranking during no start. I installed a pressure gauge into the ICP port and during no start it will go up as high as 2000 psi.

When it starts normal it jumps right up to 1000 or so and holds steady during idle. Don't know how accurate the gauge is could be off a little.

I cant see sync or anything with my code reader
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Old 07-22-2013, 06:38 AM
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One other thing I noticed is when the key is off the HPOP puts out only a couple hundred or so. Key on it jumps way up. Is that normal or is my IPR bad?
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Old 07-22-2013, 06:47 AM
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Old 07-22-2013, 07:58 PM
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Quote:
One other thing I noticed is when the key is off the HPOP puts out only a couple hundred or so. Key on it jumps way up. Is that normal or is my IPR bad?
The HPOP doesn't put out any pressure until you crank. You may see a slight voltage error of up to the equivalent of 150 psi ICP, but it is truely "0".

Your IPR is commanded to 14% at KOEO and closes to about 35% or more during start. During a very long crank it could easily get over 60%.

Since you appear to be getting pressure during a start attempt, you now need to focus on the FICM and SYNC. Since you can't read CKP and CMP, you are pretty much dead in the water unless you get lucky with a visual inspection of the sensor and plug. If you get steady RPM it probably is not the Crank sensor, but it still could be. It is more likely the CMP sensor or plug. Before you did to deep, ensure your FICM is operating properly.

You need a good monitor or scan/diagnostic tool.
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Old 07-23-2013, 10:48 AM
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Gave in and had the truck towed to a shop that specializes in Ford trucks. Found problem to be in the wiring harness. So new harness is on order and I will let you guys know how it all turns out. I will find out where the chaffed spot is when I pick it up. Thanks
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