3406E Miss

Do you have black crap in your filters? I'd maybe cut one open and see what's stopping it up.

 

Your problem could be injector seats in the head. When the seats are bad, it can clog up the fuel filters with combustion particles. It would also make the engine run bad, due to the air in the fuel. The best way to diagnose this is to run the return fuel, through a line (with a sight glass installed in the line), which you need to run up past the windshield, so that you can observe whether air bubbles or foam show up in the fuel, while it is running bad.
Another way that sometimes works to diagnose injector seat problems, is to replace the fuel injector o-rings, and observe, whether the problem goes away for a short time, but then comes back again. That shows that the o-rings are getting excessive heat, causing them to fail prematurely.
The seats can be repaired without removing and replacing the head.

 

Have you Looked into bottom of tanks with strong light to see if water or trash is on bottom of tank, you can park on hill with low side at fuel cap and syphon what collects after sitting over night?

 

Jim any updates? got it fixed?

 

I had a little miss that turned out to be an exhaust valve adjusting lock nut had backed off and fallen we figure through a oil galley and into the bottom of the pan. The adjuster had backed off all the way. I would think that something like this either on your exhaust side or intake could be causing your troubles, may not hurt to run the overhead. This was on my 5EK too.

As an owner / driver of a 5EK and 6TS, and occasional driver of a MXS, I agree 2100 is spinning a little fast for my liking.