Hey everyone, well i just got my D16Y8 motor for CHEAP. I currently have a D16Y5 which is the Vtec-E, now If i get the Y8 harness do i have to do anything to the inside harness in my car??
I know i have to get the Y8 ecu

 

Im not for sure but I bet they are the same harness. I would just try it!! : )

 

theyre not the same harness because the y5 has a wide band o2 which has 5 wires. get a y8 harness/ecu that matches your car 96-98 or 99-00 and make sure to get a 5 speed one if yours is 5 speed. unless you want to do some wiring. but if you wanted to do that you can just use your stock y5 harness.

 

All I can think of right now is that the primary 02 sensor wiring is different.

HX's use wideband primary 02 sensor while the Y8 uses the regular 02 sensor and wiring.

 

so if i get the same year harness/ecu it should plug and play to my firewall harness?

 

you mean the dash harness? yes at long its the same year range as your chassis.

 

'96 - '98 harness if its '96 - '98 and '99 - '00 harness if its '99 - '00 is generally the way it goes. The only thing is i've been told HXs remained OBD2A all the way through, in other words from '96 - '00. Honestly for the little bit of work it is to change from a 5 wire to a 4 wire O2 sensor i'd just keep the HX harness.

 

how would i convert the 5 wire to a 4 wire (i look for it on the search but got nothing).

so what ecu would i need? OBD2A or OBD2B

 

get the wiring diagrams for an HX and EX, compare the two, you will also need to aquire a 4 wire O2 sensor plug shell from a honda engine harness with a 4 wire O2 sensor (junkyard)

OBD2A

 

if i do that dont i have to add wires to the ECU connectors?

 

No. You'll simply have 1 or more wires left over that will simply be taped up at the ends. IIRC the HX is normally stated as having a 5 wire O2 sensor, but the wire diagram I have says its a 7 wire. We didn't get HXs in canada so its pretty hard for me to go check an actual HX to confirm one way or the other.

 

hmmm i see, what does IIRC?

 

^^If I Remember Correctly.

 

ohh ok, but doesnt the EX harness come with both O2 connectors or the one that run through the body is separated from the engine harness.

Theres were im a little confuse i know the primary is on the engine harness, but the secondary on out under the drivers seat?

 

???

 

with the EX harness the secondary O2 sensor wiring is part of the chassis harness and goes through the floor. CX/DX/LX have both O2 sensors as part of the engine harness. I'm not sure about the HX.

 

damn that sucks.... so if i do swap harness i have to get the chassis O2 sensor too.

well ive been looking at both EX and HX wiring diagrams and i only figure out where one wire goes to, I dont know were the other 3 or so go too.

 

https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/02-oxygen-sensor-pinout-ecu-obd2a-2280263/

i think this is what your looking for. that and a factory service manual from hondahookup.com should be all you need to figure it out.