I swapped out my 3.9 for a 5.9 this weekend, now I cannot get a signal from the gas tank/ fuel pump. Nor do I get a spark. What have I done wrong? I switched out the PCM and I still get nothing with the old PCM. Only changes to the wiring was the 7 & 8 injectors. I need help fast!

 

Fuel: Pump relay
Spark: Could be bad crank positioning sensor

 

did you switch out the bcm and ecm as well. the pcm is (powertrain control module), the transmission computer.

 

It seems that when you put in the motor, you would be wise to remove the crank sensor. In my excitement (and because I had to do it by myself) I sandwiched the crank sensor between the block and trans. Thus, truck is unhappy. I will get it fixed tomorrow and hopefully I'll be happy with that monster of a motor