04 6.0 starts, runs for 10 seconds, then shuts off.

bigfords · Feb 20, 2016

Got another good one I haven't seen yet.

The truck fires up great, runs for about 10 seconds, then engine shuts off like somebody turned the key off. Truck starts right back up, runs for 10 seconds, then shuts off like somebody turned key off.

IPR, ICP, FICM, all look good. Batteries are new, truck is ******d and studded.

Only thing I can figure is that something is wrong with the Smart Junction Box/Fuse Panel. If I get close to it while engine is running, I can hear what sounds like a relay click a split second before the engine shuts down.
I asked if the customer had any water in cab, and he said that he has seen water on the floor mat a couple times....thinking the fuse panel is shot.

Anybody seen this before?

thanks!

Gary · Feb 20, 2016

Sound like a loose injector, compression is leaking past the copper washer and aerating the fuel.

powerstrokecrzy · Feb 20, 2016

Gary said:
Sound like a loose injector, compression is leaking past the copper washer and aerating the fuel.

To test this, after it shuts off open the upper fuel filter housing, if it's under a lot of pressure and sprays out that's your problem

bigfords · Feb 20, 2016

Good info, I will take a look. Compression in the fuel will make them shut down like someone turned the key off? Engine runs pretty smooth when it is running?

powerstrokecrzy · Feb 20, 2016

bigfords said:
Good info, I will take a look. Compression in the fuel will make them shut down like someone turned the key off? Engine runs pretty smooth when it is running?

It can, yes

webb06 · Feb 20, 2016

powerstrokecrzy said:
To test this, after it shuts off open the upper fuel filter housing, if it's under a lot of pressure and sprays out that's your problem

Seen this before as well.

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Jdiamond · Feb 25, 2016

Having the same problem but mine only runs for a second. The last time I took the cap off I cycled the key till it filled then the fuel bled back out pretty quickly. How fast do you have to get that cap of? My ipr and icp readings are both very high 85% and 2900psi

webb06 · Feb 25, 2016

Jdiamond said:
Having the same problem but mine only runs for a second. The last time I took the cap off I cycled the key till it filled then the fuel bled back out pretty quickly. How fast do you have to get that cap of? My ipr and icp readings are both very high 85% and 2900psi

Fuel bled back out of the secondary filter housing?

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Jdiamond · Feb 26, 2016

webb06 · Feb 26, 2016

Jdiamond said:
Yes

Definitely shouldn't be doing that. I'd pull the fuel pressure regulator off and see if there's a split o ring or an o ring missing.

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bigfords · Feb 26, 2016

The issue on my original post was indeed the fuse panel under the steering wheel, truck would fire right up for 10 seconds or so and shut off. Fuel panel fixed it!

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webb06 · Feb 26, 2016

bigfords said:
The issue on my original post was indeed the fuse panel under the steering wheel, truck would fire right up for 10 seconds or so and shut off. Fuel panel fixed it!

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Any idea how that was diagnosed?

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bigfords · Feb 26, 2016

Yes, after checking several other things it just seemed like the PCM was losing power like somebody turning the ignition off. If you listened closely, you could here the click of a relay at the fuse panel (SJB) a split second before the truck shut off. It was a hunch.

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