im doing the mpfi wiring on my 91 civic w/ LS engine
i noticed there is a sensor on the coolant flange on the side of the block and there wasnt one on my STD engine

1: do i need this sensor?
2: where does the harness have a connector for it?

 

If it came with the engine you probably do need it. Just can't think of its name...

 

the engine came from a 92 so technically its OBD1 although i am staying OBD0
so i may not need this but i am trying to be sure before i break something

 

Thats the fan switch. You dont need to plug it in unless you want your radiator fan to turn on

It's just a standard 2-pin plug. If I remember correctly, theres a plug left over from the DPFI-MPFI swap that you can use.

Take the two wires that originally went to the back of the block (thats where the fan switches are on obd0), I believe they're black and yellow. Cut off the bullet ends on them, and solder on that 2-pin plug with enough wire to reach that new sensor.

The order of the wires doesnt matter. It's just a switch that connects the circuit of those two wires and turns the fan on.

 

so i dont use either of the sensors on the back of the block?

 

TTT

 

bump

 

you should only have 1 next to the oil filter...

 

ok i got it, im taking the 2 con from the plug on the left and wiring them to the sensor on the coolant flange


so simple...im a moron