I have an 07 CV713 with a AI400, I'm having trouble with a missfire on cylinder #6, for some background information I've had this #6 EUP break the hold down bolts twice in the past, about 20k ago and 5k miles ago. Both times eup was replaced as well as new bolts.
Most recently I replaced all the nozzles. As well as re o-ringed all EUPs with new bolts. The truck ran great for about 40 miles, better than before with the new injectors. But then it started skipping, I narrowed it down to #6 cylinder, it was just streaming fuel out with the injector line when cracked instead of pulsing like 1-5 and no change in idle.
So I put yet another new EUP and bolts as well as inspected lifter roller and cam which both look perfect. I also found some damage wires to the EUP (from when the bolts broke) and repaired that.
I still have the same symptoms and am at a loss, there is no fault codes. Also when I jump the terminals on any EUP to test that cylinder the engine shuts right off instead of cutting just that cylinder. Also will throw codes for a short on all 6 EUPs, not sure if that is normal when jumping them. Any help would be greatly appreciated!!