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Rebuilt FICM now codes say #5 and 8 low ckt
Hello everyone, this is first post in here and rusty at this. Here's the story and I really appreciate any help.
I just purchased a late model 04 6.0 with 125K, ran perfect, but check engine light was on. Put the scanner on it and it showed all 8 cylinders low voltage. So we have the FICM rebuilt by someone here local, they said someone had been in there before and radio shacked it real good, but they still rebuilt it and said it was fine. Installed it and started the truck it ran really bad missing horribly and would hardly move. We scanned it and codes came up showing #5 and 8 cylinder imbalance and low ckt. I replaced #5 injector only and started the truck. It seemed to run really good and no CEL, but once it warmed up started running bad but not as bad as it did before I replaced the one injector and also CEL came back on. I checked it for codes and it still says #5 injector low ckt and cylinder imbalance and also shows it for #8.
Wondering if you have any suggestions please help, thanks.