Series 60 Detroit

This truck is kicking my butt. Here is a little back history on what we have done: Original motor/truck is a 94 model in F'liner with a DDEC III. Pulled the top off a piston and bent the valves. Hubby found another engine(92 model F'liner), but after we had it installed, almost, I realized it was a DDECII. I changed the gear set, camshaft, rocker assembly, and injectors. Had mechanic come set injector height, valves, double check my timing, etc. It cranks and runs, but had a dead miss to it and lots of blue smoke like fuel. Computer stated that #6 injector wasn't firing. Did cylinder cut out and either off/on didn't make a difference on that injector. Mechanic left. Changed injector, put jake back on, cranked, still missing/smoking. Pulled apart and changed injector again....same thing. Disconnected wires to solenoid on injector and the smoking improved with the disconnected injector. Swapped #5 and #6 injectors just to see if the problem followed injector.....no. Still #6. Pulled wiring harness from injectors and inspected from end to end. No cuts, frays, pinches, bent pins or anything. BTW, this harness was only about5 or 6 mos old on the original engine. Also have changed the ECM(borrowed from a buddy) and the problem persists from one to the next.

Any ideas on this b/c I am about ready to set fire to this thing! I need the truck for grain harvest and got a job for it, but I have been down 2 mos now with this problem. HELP!

replies to rcjfannin@gmail.com

 

Also, the current thru wiring harness to all the injectors was exactly the same, so I am leaning against wiring or injector issue. Now what?

 

I am about to scream and blow this sucker up. Pulled the heads and found bent valve. Changed it, new head gasket, put back together. Still missing on 6. Mechanic suggested pull #6 injector and blow thru listening for air in intake and exhaust. What else? I am at a loss! Still got blue smoke rolling from it like it is fueling constantly, or not being burnt off. Any ideas now?

 

Signal is good to all injectors and te OHMs were all samr across board.

 

I just cant figure out why computer would show 6 not firing, but I got blue smoke rolling and fuel in hole when I pull injector. Even swapping 5 & 6 didnt solve. Cyl cutout test done and you could tell there was no diff in that cylinder when turned off