I've got a bone stock lb7 just replaced all 8 injectors and fcim. Before I replaced these the truck ran good if you didn't put your foot to the floor if you did it seemed low on power. Long story short the truck went into limp mode so I replaced injectors and fcim but the truck still runs the same way it did before going into limp mode. I thought maybe throwing new injectors in would increase performance but there is no difference. So what I'm asking is this just the way the lb7s are?? Is there a specific programmer or chip that will make a very noticeable difference in power? Or is a good running lb7 gunna really jump up and move? My dad's got an f350 04 stock and he smokes me without even thinking about it. Been trying to figure this out for a long time some helpful advice would be greatly appreciated!

 

Why did you replace the fcim?

You need to log fuel pressure as it may be a CP3 problem

 

Because after I swapped the injectors truck was still in limp mode took it to shop and found the fcim was bad. Yeah I'll check cp3

 

I have an LB7 @ work and its no sloutch ..