Ok yall, help a brother out here. I keep getting a random contribution code after I accelerate hard. Say like 60-70 percent throttle. Bucks and jerks. Won't get out of its own way. Now here's what's funny, if I shut it off, starts up and running perfect. If I don't get on it, it won't throw a code. Thing is, it's not always the same cylinder. I changed injector harnesses once already. FICM voltage is perfect all throughout. Holding great ICP . Question is, can my FICM be bad, even when on the surface everything looks good? Would it randomly cause an injector to under perform ? I'm to the point I wanna just get a new harness and FICM. Anyone ever had one do this?!?! I thought about load testing the harness, just seems kinda pointless when it's never the same injector. Which makes me lean towards FICM. Open for input fellas .
What am I missing?
- Thread starter Irontx
- Start date
Luke@MillerPerformance
Member
Check the ground wire on the injector harness. I've had a few FICMs kill the logic board but that shuts the whole truck down. What about the connectors to the FICM? Are all the lock taps there and clipped in?
Luke@MillerPerformance
Member
Alliant makes replacement connectors for the both ends of the FICM harness. Kind of a pain to repin them all. I would get a 100% new harness if possible.
