Hook up a laptop with INPA running. Drive around and watch for knock events in INPA.
As for the ECU reporting the wrong injector, I have only seen this once before. The ECU was reporting injectors based on firing order, not on physical location.
Equal Opportunity Harasser!
6MT | COBB | AR | AE | Forge DV | HPF | P3 Gauge | Hybrid Intake | O.S.Giken TCD | M3 bits