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Hey nice truck. Is it a LLY?
Why did you have to replace the Ficm what issues did you have with it.
I’m having a idle misfire after installing brand new injectors. I can’t figure it out

Yes, LLY. I meant to say I had to replace the glow plug control module, not FICM. Idle misfire could be a bad Fuel Pressure Regulator Valve, relatively easy ~$50 fix. Search for "bottle test" to check it.

ALLY Cat said:

Yes, LLY. I meant to say I had to replace the glow plug control module, not FICM. Idle misfire could be a bad Fuel Pressure Regulator Valve, relatively easy ~$50 fix. Search for "bottle test" to check it.

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I replaced the fprv and nothing changed. I also did the fpr and nothing changed. I still have the misfire once the truck warms up and reaches 170deg plus it starts to misfire/surge. It’s a problem that no one has an answer on this forum.
I replaced all 8 injectors brand new Bosch
Fuel lines. Return lines. The fprv the fpr the fuel filter head is new with new filter all the high and low pressure fuel hoses and new batteries. Start the truck runs perfect temperature hit 170 and idle goes into a lope/misfire/surge. No cel no codes. No soft codes. Trucks at a shop as we speak waiting to find out but any knowledge or help is appreciated thanks!!!