I am working on my early 03 6.0. Recently, I was driving down the road and around 70mph and the truck lost power and puffed a little black smoke and then stopped running. Would crank but not restart. I used a multimeter and checked ficm output. I have the 7 pin and it was 48v key on engine off, and 47v while cranking. A friend used a lotus computer system and no codes were found. All he got was no communication with the cam sensor. I replaced cam sensor and still a no start. Even after sensor was replaced, I don't have any tach movement while cranking. Any help is appreciated.

 

Crank sensor? IPR valve? Do you have oil pressure on the dash guage? You really need some diagnostic tools like a scanguage so you can read ipr percentages and ficm sync etc

 

Waiting on scangauge 2 to arrive. I do have oil pressure on my gauge when cranking.

 

Do you have crank/cam sync? Check the plug and harness to the crank sensor.

 

The Lotus computer was picking up signal from crank sensor but not cam. Plan on putting lotus back on tomorrow. I'm trying to figure out if my ficm is bad but tested good since I am not having any communication with the cam sensor.

 

did you try starting it with the icp sensor unplugged?

 

Not yet. That is on my checklist to do tomorrow. I believe I may have the problem narrowed down as to the ficm not syncing since it isnt picking up the sensor.

 

I meantion try starting with the icp unplugged because it is free and easy to do. If you have the means you really have to check what your icp volts are koeo and what your icp psi and ipr % is while cranking. Don't quote me on this, but you may not be seeing ficm sync because your not hitting the 500psi of oil pressure before the truck commands the injectors to fire. Looking at the ipr and icp will tell you more of what might be going on. It could also be very well that a sensor has gone out since you were driving it when it quit. A dieing oil pump will usually show as a warm no start condition. Is your fuel pump running when you key on? All fuses are good? Start with the simple checks before throwing good expensive parts at it, but regardless a live data monitor is a must.

 

Put the truck on my torque app. I was getting ficm-47.8, ipr-83.5, icp-300 to 600 fluctuating, and ficm logic-11.5. I just put in a new icp sensor and still no start.

 

If it's not your ipr being an 03 then it's probably your oil pump.

 

Is it possible my ipr valve is bad then?

 

it would be worth pulling the ipr and checking to see if anything is jammed in there or the screen is broken but failing that its most likely the hpop since the 03's don't have stc fittings, stand pipes, and dummy plugs that commonly fail and have a notoriously weaker oil pump than the 05's and up. and no you can't just simply bolt in a 05 and up oil pump and call it good.

the fact that you are seeing 85% ipr while cranking is telling you that you either have a leak in the oil system or a weak/failed oil pump...sadly leaning towards the oil pump being an 03.

 

Would the oil pump fail all at once or would there be symptoms leading up to it. It looks as though it is trying to make psi since it reaches 700 icp while cranking sometimes. It drops back to 300 and fluctuates between the two when cranking. Waiting to get a socket to pull ipr today.

 

That part I'm not sure about and hopefully someone with a little more knowledge can chime in as far as the pumps failing all of a sudden. But who knows, unless you were monitoring it before your motor quit you really don't know how healthy it was to begin with. Another thing about the early pumps if I recall is there is a pressed in plug or BB somewhere that has a tendency to blow out. I'm not sure if that would cause your symptoms as well.

 

Ever since I got this truck, it seems it's been cold natured. Always had to let it warm before I could go anywhere. But when warm, it always had full power.