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Thank you very much cfi-efi, do you think it could be my problem?
No. Not unless the SWITCH is stuck in the "on" position and constanly running your ninth injector, making it PIG rich. The TPI guys may have more to say on the subject, though.
With limited TPI experience, I would say yes. With the switch disconnected, it can't feed a signal that would activate the injector. That doesn't mean that the 9th injector isn't leaking.