Need Help! 2003 Hard Start/No Start

[Rider2767]

Hey guys, this is my first time posting so I apologize in advance haha.

I've got an 2003 dually I bought for a work truck and run fine for a while.

I replaced the radiator and since for some reason everything went downhill in a hurry.

Truck had what I think was a knock from the CP3 but I'm not sure.

It progressively got harder to start, now barely starts at all. When it does bust off it runs for a few seconds and does. I've replaced the lift pump, added one to the tank, replaced the filter, and the FCA.

Also bought two new batteries. Checked fuses couldn't find anything and I'm at a dead end.

I think it's the CP3 but just trying to figure it out before I go to replace it.

Any suggestions would be great!

Thanks in advance.

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[IGOTACUMMINS]

Let's ask @Polaraco?

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[timshooter40]

Have you put on a fuel pressure gauge on your CP3 pump and checked pressure readings?

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[Rider2767]

There was a rail pressure gauge on the truck but it quit working about a week before this started.

I know its pushing enough fuel to the CP3.

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[david3gen]

Have you put on a fuel pressure gauge on your CP3 pump and checked pressure readings?

X2 on this


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[68muleteem]

Being an electronic engine I would start by checking what it sees for fuel pressure.

I have repaired several of these with a bad return circuit on an injector.

You have to plug each line at the fuel rail one at a time to find this.

If you can either it and it will stay running this is most likely the problem.

It just will not build enough pressure to let it start.

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[Rider2767]

68muleteam

So you would either it to see if it stays running?

That would most likely been it's an injector issue?

The truck to me never seemed like it had an injector problem until it quit.

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[Polaraco]

68muleteam

So you would either it to see if it stays running?

That would most likely been it's an injector issue?

The truck to me never seemed like it had an injector problem until it quit.

There was an issue with carbon buildup in the heads. Been a while since I've seen that.

When it is running, is there any smoke?

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[Rider2767]

There was an issue with carbon buildup in the heads. Been a while since I've seen that.

When it is running, is there any smoke?

No smoke at all.

Other than black on a couple tunes that I kept it off of.

Am going to flash the ecm back to stock when it is running again.

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[Rider2767]

Also is now blowing out white smoke when it dies.

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