Ok i just swaped a 89 d15b from out of a ef front clip into a 91 civic dx. The dx was dpfi ok so i no i gotta switch it over to mpfi i no that much. But when i went to put the dx harness back on i noticed that the d15b only had one plug on the back of the block. I really can't explain what they are but i took pictures any help will be really helpful thanks..

this is the back of the d15b2


this is the back of the d15b


Picture of full motor

 

the sensor on the left on the D15B2 is the cooling fan switch - on the D15 this switch is on the thermostat housing - you will need to extend the wires and install a different 2-wire connector in order to plug it in

 

This guy is right. Just source the plug from the junkyard, and wire the plug to your existing harness.

 

heres a pic of my thermostat housing i don't see what your talking about.. And i just notice that there are alot more places for hoses help...