Hi All,
I got an '01 v10 Excursion a little over a year ago to use as a tow vehicle. Overall it has done a good job and is nice to travel in. Plenty of room for the family and dogs. Handles my 30ft bunkhouse with no issue.

Now for the bad (and the purpose of this thread). It had misfires issues when I got it. Enough that it would throw codes etc. I replaces all the plugs, COPs and damaged COP connectors. This got rid of 95% of the misfire issue, but I still have a slight one. Not enough to throw a code, but I can feel it shudder in low rpm high load situations. I confirmed this by using Forscan and Mode06 to ID the cylinders. It is consistently cylinder 2 and 7 (right across from each other). I have swapped plugs around as well as COPs with no change. I also replace the injector electrical connectors since the previous owner had zip tied them on.

The only thing left I can think of is that the #2 and #7 injectors are bad. My next step was going to be to swap the #1 and #2 injector to see if the misfire follow it. I haven't messed with injectors on the v10 before. It looks like it is just a couple of bolts on the fuel rail and then the injector pulls out. Most likely seated with an O-Ring of some sort. Am I thinking correctly? Anything to watch out for when swapping the injectors around?

Also, if it isn't the injectors, does anyone have another idea on what it might be? Is there something electronically that it being the #2 and #7 cylinders would point to? Do they share a ground or wiring of some kind? I am kind of at a loss on this one.

Going to post over in the Excursion forum as well.

 

Can you configure FORScan in the oscilloscope mode to watch the voltages of the COP's when the engine is running?

If you do lift the fuel rail I'd have a number of replacement o-rings at hand---if they're original some might need replaced.

 

Maybe. I haven’t messed with the oscilloscope feature at all in Forscan

I also have OBD fusion that I could look in to.