The only reason that i even got curious about this is, know that some of the newer integras have Knock sensors in them, although my motor doesnt, my ECU may be looking for it due to the fact that i've changed everything over to obd1 (dizzy, ecu, engine harness, ect.). I'd really like to know if the ECU requires it in it's lil self check before it allows the motor to start, because if it doesn't then technicly it wouldn't need it! At that point i jest need to know if not having it will hold it back from running properly.