I just swapped qg15de(n16 primeras engine) neo di version in my nissan b11 85 sunny and thils engine is nvct (nissan variable cam timing )
so i want to ask about the colour codes of that dlc wire and ecu of qg16 and qg15 are same so i need a help in that .
then comes a issue of o2 sensor.Now i have a bigger grip of o2 sensor blue grip i guess it is three wires but the header is pentagonal and o2 sensor fixed on it is only having a single wire so it wasnt connected and i told electrition to connect it and he was smiling at me that connecting it doesnt helps anything and i was like they are idiots .so then he hooked a single wire to that three pin grip .Now how can i check im not wasting any extra gasoline due to this o2 sensor thingy .Please help me in checking it .car is giving around 12-13km\L on local with high footed as i rev the car too much but with low feet it gives around 14-15 km/L.and then comes another issue that egr is also installed in it and how will i confirm its working ? as its exhaust pipe isn't immersed in the exhaust header and is pressed and closed at end but water pipes are properly connected .
That's my number.
any help on my problems will be highly appreciated .