6.0L Sputters for first 30mins then fine???

[straightpipe6.0]

so my truck has started doing a strange thing. Starts normal, idles normal, when i start driving everything is normal until start to step on it, then the truck surges and sputters like clogged injectors or something. once the truck is good and warmed up it runs perfect. No hesitation no sputtering! I just changed all my fluids and filters as well as drained my water fuel seperator but still no change. My SCT reads codes and the computer is reading no issues. Im starting to think FICM issues might be my cause. Any ideas?

[2006PSDSD]

Look at the FICM first. I'll bet you pull some codes that point at the FICM

Eidt: the SCT won't see those codes, you need a quality code reader for them (considered soft codes)

[Clay Henry]

The injectors are sticking when cold. I would get it fixed ASAP. I ran mine like that with 3 sticky injectors for 2 years and at some point it melted the 3 piston tops and galled up the cyl. walls from high heat caused by the lean burn when they misfire.
Several folks have had success with a product caled Rev-X. google it, its worth a try. It worked for me for a little while then the problem came back and a second dose did no good.

[Clay Henry]

Originally Posted by 2006PSDSD

Look at the FICM first. I'll bet you pull some codes that point at the FICM

Yes, I forgot to mention this. Also a good possibility.

[2006PSDSD]

We both win then, Clay

[Ridindirty91]

It could also be glow plugs. Mine does this right now because my low plug relay on the left side of my engine is out and all 4 don't work. If I leave it plugged in its fine but if I start it after sitting all night without plugging it in it will do the same thing for about 20 min or so. Your glow plug codes won't show up if the motor is warm and running but they will show up if you check em before you warm the motor up, at least that's how mine is anyway


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[Clay Henry]

Originally Posted by Ridindirty91

It could also be glow plugs. Mine does this right now because my low plug relay on the left side of my engine is out and all 4 don't work. If I leave it plugged in its fine but if I start it after sitting all night without plugging it in it will do the same thing for about 20 min or so. Your glow plug codes won't show up if the motor is warm and running but they will show up if you check em before you warm the motor up, at least that's how mine is anyway


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This I have never heard of. GPs aid in starting and do nothing for running after its started. You likely have the same issue as the OP.

[Six0~Stroker]

.....

[Ridindirty91]

It doesn't do it when I leave my truck plugged in though? Otherwise I would think the same thing


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[2006PSDSD]

Originally Posted by Ridindirty91

It doesn't do it when I leave my truck plugged in though? Otherwise I would think the same thing


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You have the same issue(s) the OP has. GP's only aid in starting, once it's running they cycle off. When your truck is plugged in, your oil is warmer, and the FICM will actually get warm too. Oil flows better when warm, and the FICM solder joints (likely broken joints) benefit from the warmer case