I have a 90 acura integra with LS/VTEC it has a pr3 ecu i am pretty sure its the knock sensor, we have tried grounding it out,and screwing it in the trans (not my idea, only place it would go).I found this one forum where this guy took a piezo transducer from radioshack and wired it up threw the knock sensor wire and taped it to the fuel rail and it worked.I know your actually supposed to drill and tap a hole on the alternator bracket but im lazy and tryin to find a quick remedy.I'm also not runnin a 02 sensor but I was told that you dont need it for VTEC to work.