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Ok so I was having problem after doin a egr delete and oil cooler swap, truck ran great prior to swap just oil was getting above the 15 degree window and when I got the swap done the truck ran like hell.... After further diagnosis when I unplugged some injectors and the when I unplugged number 4 the truck ran awesome aside from having the miss, when I plug 4 in I get a miss on 1-4-6-7 cylinders I had some guys say bad injector but they said to cross the injector to see if it acts up so I plugged cly 2 in to for and did fine then plugged 4 in to 6 and to no suprise it start running like crap again so that tells me the injectors are fine and I'm getting a jump in the wiring somewhere or a short or a communication issue from the ficm and help?
Make sure that you have not somehow (hard to do) got some plugs
in the wrong place. I would also make sure that the harness is not
being crushed by something. But this really sounds like an odd one.
The harness is good already stripped it and checked for a chafed wire, they are all in the proper spot and the plugs are seated good no bent prongs was once thought to be a injector issue but eliminated then when it still done it being plugged in the number 6 cylinder, I am going to to us a multimeter in the am and see what kinda volts I'm getting out of the plug in the am and my ficm in putting out 48 volts on a cold start up it drops to 47.5
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