Hi guys, any help on this one would be much appreciated. (and i have been searching for a few hours now... just finding info on oil/oil clogs) Right.. I have a 92-95 EG civic, OBD1 Engine B18cR Ecu, P73 ob2a, running with obd1/obd2a conversion harness.. The problem I am having is driving the car it physically wont rev past approx 5500rpm. and subsequently vtec will not engage. The car will rev past this in neutral, but obv there is no vtec engagement for this. Really not sure what to try to solve this problem - any ideas?