Anyone else having issues with a 6.0 Excursion running rough and stalling

Hi everyone, I just got my first diesel, a 2005 6.0 Excursion with studs and a coolant filter. After running for over 6 hours, it starts misfiring and stalling, making it really tough to restart. But once it cools down, it’s fine. There are no codes showing, so I’m not sure where to start. Any thoughts?
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It seems like there could be a problem with the fuel supply

Maybe start with changing the fuel filters? I really think it’s a fuel delivery problem

Have you checked powerstrokehep.com? They have some useful videos on Ford issues

I agree, start with the fuel filters before buying a bunch of parts. Did you get fuel from any suspicious stations that aren’t busy?

Gael said:
I agree, start with the fuel filters before buying a bunch of parts. Did you get fuel from any suspicious stations that aren’t busy?

Yeah, I’ve gotten fuel from two different stations, and both times it happened. I’ll start with the fuel filters.

Check the connection at the FICM. Sometimes they come loose. If it’s stalling under a quarter tank, the fuel pickup straw might be bad. Installing a lift pump with its own straw could help

Spence said:
Check the connection at the FICM. Sometimes they come loose. If it’s stalling under a quarter tank, the fuel pickup straw might be bad. Installing a lift pump with its own straw could help

Got it! I’ll check those connections. It stalls even when the fuel level is high.

Have you thought about whether the FICM voltage drops when it gets really hot?

Hazel said:
Have you thought about whether the FICM voltage drops when it gets really hot?

I’ve considered that. When it’s cold, the voltage is around 47.6-48 volts

Zara said:

Hazel said:
Have you thought about whether the FICM voltage drops when it gets really hot?

I’ve considered that. When it’s cold, the voltage is around 47.6-48 volts

Cold readings can be misleading. Mine was 48 volts when cold and dropped to 26 volts when warm

@Vale
I’ll warm it up and check the voltage again

While it’s warm and running rough, try pouring a little cold water directly on the IPR. If it starts running better, you’ll need to replace the IPR. If not, at least you’ll rule it out

Olen said:
While it’s warm and running rough, try pouring a little cold water directly on the IPR. If it starts running better, you’ll need to replace the IPR. If not, at least you’ll rule it out

Thanks! I’ll give that a shot

For the rough running, consider the blue spring upgrade at the fuel cup. A long crank when warm could mean there’s an internal oil leak in the injection system

Tate said:
For the rough running, consider the blue spring upgrade at the fuel cup. A long crank when warm could mean there’s an internal oil leak in the injection system

I’m definitely going to order a blue spring for it

By the way, I really like those factory wheels from that time. I had them on my '89 Lariat 7.3!

Linden said:
By the way, I really like those factory wheels from that time. I had them on my '89 Lariat 7.3!

I love these rims too!

It sounds like a common hot no-start problem. You should be able to read ICP PSI and IPR % while cranking. It starts fine when cold, so check those readings once it’s warmed up. Likely, it’s bad O-rings on the standpipes or dummy plugs. If there’s no HPO over 500 PSI, the truck won’t start or run properly

@Koa
I should be able to see that on a regular scan tool, right?