also check the wire going into the ipr. the FICM wires and ipr wires can get tangled together and pull the wire out of the ipr(happend to me)

It is possible the glow plugs are junk but they usually give u hell in the winter did you update the ficm????? In 2003 they were not programed to buzz the injectors

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Pull the fuel filter out that's in the frame rail and c if theres silver stuff that looks like paint chips

I have not updated the ficm but im the second owner I've had the truck fir 3 tears now with never-ending issues. I'm having the worst of luck and throwing money at it doesn't work. Everyone says take it to someone that knows what their doing. Hahahaha they all say they know but just bill and say I can't figure it out.
I'll check the wiring to the ipr
The fuel system is upgraded to the airdog 2. That was the first $1200 when the stock pump went out with a $300 tow Bill. Lmmfao

A few things, you say oil pressure is 670ish. Is that desired or actual?

Have you checked fuel pressure yet? You can get a cheap fuel pressure gauge from harbor freight, hook it up to the fuel bowl on top of the motor where the fuel filter is, run it out under the back of the hood up to the windshield and you can hold it down with the windshield wiper to see it. See what your fuel pressure is at.

I doubt bad glow plugs would prohibit it from starting once it got warmer... that's the opposite of what would happen. The glow plug systems on the 6.0's are pretty stout anyways.

When you're cranking it over and over and it's not starting, are you getting any smoke at all out the exhaust? What color?

Oil pressure is actually 670 ish. When im cranking it it hardly ever smokes but now an then ill get a little puff of light grey. If it was a fuel pressure issue wouldn't it run ruff or lack power? Once it started.i:s:

I've started my truck and had it idle smooth as silk... with the fuel pump unplugged. It just wouldn't run anywhere. It could be kicking intermittently. Tough to say.

Now, if you're telling us that you are not really seeing any smoke when cranking, this means the injectors are not firing.

How are you measuring ICP pressure? Scanner? You should check FICM SYNC.

If there is no smoke, it's either not building enough oil pressure to fire the injectors, or the FICM is not doing it's job, despite the good voltage readings.

Yes the last mechanic showed me on his snapon scanner the oil pressure. He said he could get any codes out of the truck. He basically wanted me to leave my truck there until he could figure it out. he already had it 2 weeks.

What does the ether do to make it start?

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I just was able to pull some codes p2617 and p123; thats no a typo that's what it read.

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The p2617 is crank position but i geuse yhat come when you crank it over a lot

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So if my small fuel filter on top of the motor is bad could that cause the problem? I pulled it out today and the truck started right up.

Don't use ether. It's a "fuel" source if you're having fuel issues. However, when the glow plugs are on you have a good chance of igniting it before anything is moving. Heard HORROR stories of blowing blocks apart and heads off. It's very dangerous and I would avoid it at all costs.

So if it starts with ether, or now it starts with the top filter removed... you may have a fuel delivery problem.

You're most likely right about the crankshaft position code, that and the camshaft code are thrown a lot falsely when trying to crank a truck a lot and it's not starting.

No smoke coming out of the exhaust also means no fuel.

I would put a fuel pressure gauge on and see where you're at, with the filters in. :c:

I will give it a try.

With the scanner the oil pressure is 670 is it possible thete is still a leak? The reason i ask is. When the truck is running i can shut it off and start it right back up but if i let it sit 5 minutes it won't start. I'm thinking the oil pressure is bleeding off somewhere. The scanner shows It's holding 10.8.

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10.8 when not running

If the truck isn't running or turning over it can't build oil pressure, so I wouldn't worry about that.

The 670 is actual ICP then? What's the desired ICP. We really need both of these numbers together. Your IPR % duty cycle will also tell us what is going on. The IPR is what actually regulates the pressure.