First thing would be that the car won't start. You can also just look in the trunk next to the spare tire hole and under the plate is your fuel pump. If it is not there then you will know.
i would like to know as well
Yes the ecu will work. First disconnect the battery and connect the new one then reconnect the batter. Start up the 240sx and it should work it not it needs to be diagnoste goggle 1990 240sx ECU CODES FOLLOW THE STEPS AND THAT SHOULD WORK I know cause I'm using a 1992 ECU FROM Nissan Stanza. I was told it's alittle advanced on the horse power side and idle moves quicker.
I want to know how much is the Nissan saloon 86 model's fuel consumption?
Look at pictures, or know that 89-90 have a sohc ka24e and 91-98 have a dohc ka24de
116638 is fairly low mileage, but they did not make the 240SX until 1989. My 89 coupe has around 136000 on it (don't know exactly because someone tampered with the mileage)
As far as I know, it should have a gasket. Make sure to use gasket sealer as well when replacing it.
Just replace it.
there is a retract control relay, i don't know where it is but look at the fuse/relay boxes under the hood, it should be marked
your temp guage will sky rocket if its bad, you may even have coolant a coolant leak (comming out of the the housing of the thermostat). replacing it is easy and cheap.
why would we want to know