6.0 starts and runs fine then misses, has no power then stalls

[0360PWRSTROKE]

Hey Everyone, I gotta problem.

Awhile back i was driving down the road when my truck lost power and dropped down to low idle and died and would not start. The truck wasnt fully warmed up yet. After the truck cooled off it would start back up and run for a little bit then fall flat on its face and die again. ICP sensor is fairly new and is not leaking oil, had Swamps rebuild my FICM about a year ago and a new full engine wiring harness. The EGR valve isnt looking to bad but i will be cleaning it. The truck is an 03 F250 6.0 with 205000. Any help or ideas would be greatly appreciated. Eric

[southend]

Check your fuel filters and fuel pressure. Any injector work recently?

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[kaya@bernhausen]

sounds like an injector allowing combustion gases to backfeed through the fuel system.
copied from FTE:
COMBUSTION GAS ENTERING THE FUEL SYSTEM (Balloon Test):
Inert combustion gas(ie exhaust) in an injector can cause a random misfire in one or many cylinders. Combustion gas may leak past the injector's needle and seat, or the copper combustion seal. Once the combustion gas enters the fuel rail in the cylinder head, it then distributes to other injectors, typically on the same bank. To diagnose for combustion gas entering the fuel system:

1) Remove outlet fuel lines from the fuel filter housing on top of engine.
2) Install a balloon over each fuel line with a zip tie.
3) Disable the fuel pump and fuel injection control module (FICM) relays.
4) Crank engine and watch for compression pulses in the balloon.
5) For each line where compression pulses are evident, remove all but one (1) of the glow plugs from the affected cylinder head(s).
6) Crank engine and watch again for compression pulses.
7) Remove the glow plug and transfer it to the next cylinder in the head and repeat Step 6.
8) For each cylinder where compression pulses are evident remove injector(s) and inspect copper gasket and lower O-ring, replace if necessary. If gasket(s) and O-ring(s) are OK replace injector(s).
__________________

[southend]

Yep, that too. Saw my lead in question? Lol. A quick check prior to nailing down which injector, is to remove the sec fuel filter, ficm relay, and hfcm fuse, crank the engine over and look for bubbles coming up into the fuel housing.

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[kaya@bernhausen]

lol. no i just started posting and was digging around for the test procedure to copy instead of typing it out. then you slipped in there between that time! haha.
op, i would try southends method. less mess. if you look closely, you can actually see which side the bubbles are coming from at the ports inside the housing as well. so not even really a need for the balloon test.

[0360PWRSTROKE]

Ok i got a buddy with his sct to read the codes that is finally brought up. It is a U0306 code. If i understand correctly this is FICM not compatible. Could the batteries maybe cause this??? The truck has had this FICM for over a year. Confused ??? The truck does crank kinda weaker than normal...they are only a year old too

[southend]

Bad batteries kill ficms real quick. Can you read the batt voltage and ficm voltage cranking?

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[southend]

Usually if your truck will start and run without dying, the ficm is not the single problem, I still think it's fuel related.

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[kaya@bernhausen]

absolutely. disable the fuel system, pull the cap and have a look in there while someone cranks