[COLOR=black][FONT=Verdana]I just replaced Cyl. # 1, 2, 4 injectors due to them being bad. I know am getting a code from time to time showing P0304 when I first start the truck up. I and sometimes I am getting P0300. Does anyone know what I should start looking for to find out what is going on? I currently have the truck tuned with the Edge tuner set at level 3 (Performance)? Thanks for any type of help.

 

Have you checked the FICM?

 

P0304 is cylinder #4 misfire. Several possibilities; either the injector wasn't the problem, it wasn't torqued down properly, or the new (reman) injector has problems.

 

I have not checked the FICM, Something that I did notice when pulling the New Injector out of the Box for that Cyl. was the Injector appeared if it had been taken out of the box before. The Injector did not appear as if it had been used before though. How do I test the FICM?