Hello guys,

I am going to do engine swap on 91 civic (D15B1). I am trying to disconnect sensors on the engine so that I can take it out.

So basically, if I understand it right:
Two prong sensor on the side of head=>Coolant temp sensor
One prong sensor on the side of head=>Coolant temp sending unit
Two prong on the back of block=>Fan switch
One prong on the back of block=> oil pressure switch

Quesions:
1. where is the knock sensor? It does not have it?
2. How to take off the wire off the two prong sensor on the back of block (fan switch). It is so tight, can't even get the rubber boot off. Any technique to take it off? Worst case scenario, I will have to cut the wire

 

1. Afaik only vtec engines have them.
2. Pull harder.

 

if you are swapping to an OBD1 or OBD2 engine, they have the fan switch on the thermostat housing, with a different connector - you would need to cut the wires, in that case, to swap on the different connector