The oil was changed 1000 miles ago during regular maintenance schedule. The surging issues was there before the change, but the surging is getting worse amd worse over the past few months. Wife wont drive the truck now.

 

Have you checked your oil level lately? If you are getting fuel in oil this could cause surging and in fact make it get worse as time goes by.

If it looks like you are making oil you would eventually overfill and create foaming which could / would produce the surging under all the run conditions you mention.

This condition may not throw codes. Making it hard to diagnose. Has your MPGs gone down lately?

This was recommended to us sometime ago by another poster:

One method for checking for fuel in the oil is to take a white paper towel and put a drop of oil from the end of the dipstick on to the paper towel. It will make a round dark stain. If you have fuel in the oil, it will make a lighter stain ring around the oil stain.

Something else to consider anyway.

Good luck and be safe out there.

 

You have the same problem mine had. I have driven over 1000 miles since my last fix and have had no more surging/bucking scary rides. I know what you are going thru, it is down right frighting when it would do it, like pulling in the garage! Anyway, find out when a Ford Diesel Engineer will be at your dealer the next time and schedule an appointment for that time. I did this because I, like you, got tired of dealing with this issue and I would not let my wife drive this thing. When the engineer drove it it did not do it either, however he ran his own diagostics on it and magically he found two codes and one of them was electrical shorts in the system. He ordered the dealer to replace the engine wiring harness (this is in addition to the FICM harness). The tech that performed the work told me that he did find chaffing issues with the engine harness. All I can say is that I love my Excursion and the 6.0 again. I honestly think there will be another recall on the 03's and 04's on the entire engine wiring harness soon. I had mine in at least 4 times for this issue and they said they fixed it and got no more than 10 miles down the road from the dealer and it would rev up (surge) while going down the highway. Like yours, it did not matter if it was hot, cold, idleing or doing 90 down the road, although it loved being in rush-hour traffic in Atlanta and trying to eat the rear-bumpers of the cars ahead of me! Sometimes it would stall while in rush-hour, that was always fun. It never did just die on me while running down the road at highway speeds though.

Anyway, I hate to hear other people going thru this, but I think mine is fixed and that is how I went about getting it that way.

 

however he ran his own diagostics on it and magically he found two codes and one of them was electrical shorts in the system.

This problem is old news...can't believe that some techs are failing to do a complete thorough wiring inspection.

Glad it has been found gawent .

 

Will check the oil for fuel. The dealrship still has it and it hasnt surged for them. Unreal. It did when I dropped it off this morning. Very very frustrating. This cant be that hard to figure out.

 

04Excursion,
have you tried a different dealer? I bought mine from the largest Ford dealer and service department in the SE located in Georgia. They have 80 bays! I guess what I am saying is this. I live about 2 miles from a Ford dealer and it would be real easy to deal with them, if I had faith in them. I don't, hell, they can't even sell me a vehicle, I have tried 4 times in the last 10 years. I drive 45 miles to get to my current dealership and service department and based on the level of service I have gotten from them, I would drive 100 miles!

Good luck with your issue, and I would keep telling them to check the harness.

 

I will try another dealership if they cant fix it. But they still have it and no word yet.