4gzchatch

Hey all, I am helping a friend with a b16 swap into his 98 civic hx. It is the one with the vtec-e system, and all the wiring appears to be correct. I talked to HASport, and they said that the only wiring change that will need to be done will be to the O2 sensor, and said it needs moved to the position on the ECU that the EX/Si uses. Does anyone know exactly what the change is, or has anyone done this swap before? Is there a service manual online that I can access? We're doing the swap this week, so I really need to know! Thanks in advance!

JAPCIVIC R

what year is the motor?

4gzchatch

It's a 98 car w/a 95 motor. We're using an obd1 ecu with a skunk2 obd converter harness to go obd1. Can you help me?

pdiggitydogg

http://www.hondaswap.com/forum...29814

DeuceLiter

whoever told u that the o2 sensor is the only wiring change is a complete retard. i was gonna say that ur motor and car are gonna be running off different on-board diagnostic systems, but ur using a skunk2 converter, which makes work 10 times easier.

ive studied wiring for a B18C1(USDM) swap, and ive made diagrams before. since ur using the converter, im guessing ur engine is now ODB-II. heres what the b18 swap looks like:



THE TOP DIAGRAMS ARE THE B-SERIES MOTOR HARNESS AND THE BOTTOMS ARE THE CIVIC HARNESSES.

green is just a direct plug-in. blue means u dont have to worry about it cuz the B-motor doesnt have it. orange is a direct plug but the wires must be modded for different locations. red means u must wire it.

DeuceLiter

^ there is no B harness if ur car is an automatic.

4gzchatch

so it will be the same for the sirII motor as for the GS-R?

Also, does the EK harness come off on the ECU side, or do you have to just pull it out of the motor and lay it somewhere? It doesn't look like there's any connector on the pass. side...

Finally, does the 5 wire O2 sensor work for this swap, or do we need a 4 wire?

Thanks for the help/diagrams!

JAPCIVIC R

you should be able to pull the harness from the bay just make sure you unplug it from the ecu and the car harness which is a green plug, use the four wire o2, i just did a b18c swap in my 96 hx so if you run into any problems just im me.

4gzchatch

OK, so I'm studying this diagram, and it makes good sense, but can you tell me what these ones that need modded or added are? I don't know what all of them are...

On the A connector: I see the #8 is vtec solenoid, and it already has that one, since it has the vtec-e system. I know what the IATC is, but I don't recognize NTC or IAR sol.

The C connector doesn't look like it needs any mods at all...

On D, I don't know what KS is.

If you could explain those few things, I'll be good to go! I have the complete harness that came with the new motor, and that I can chop up, so I don't think I'll have any problem with connectors or whatnot.

Thanks!

Bseriescivic5

heres my .02 About 8 months ago i put a 95spec, USDM B18c into my 98HX civic......god di i have problems..well i used a obd2- obd1 conversion harness along with a modifyed o2 sensor. However after everything was wired up correctly the car hesitated like no tomarro, and i couldnt figure out what the problem was. repaced the plugs, plugwires,dizzy, o2 sensor, ECU , and nothing seemed to work. Well about 1 week b4 i totaled the car, we found out that the problem was the HX wireing harness, you have to use an EX wireing harness to get it to work. Hope this helps ya

4gzchatch

Japcivic R, did you use your stock HX harness? What trans mount did you use? We ended up having to buy the mount and bracket for the 99 Si, but we won't know if it will work until it comes in tomorrow. I did get the Si L-Bracket and the motor side mounts are supposed to line right up. I guess we'll see, but it seems like these issues would get posted somewhere as the HX being an exception to the rules. Everything I've found about the EK makes all these generalities about compatibility, which I've found to be grossly untrue about the HX. It's just weird, but hopefully we can get it to work right...

JAPCIVIC R

yes i did use my hx harness, i did have to extend just about all the wires but every things there, i also went ahead and took some wires out like the egr valve and the secondary 02. the tranny mount i used was the one from the b18c. and the drivers side mount was from a si, the one that bolts to the block,

mastarolla

we were going to do a swap with my HX as well and decided to just plug in the B16 harness (engine side) and run the OBDI conversion. It should still work

4gzchatch

So on the diagrams above, can you tell me what the red and yellow ones are? Or can you tell me what you moved around? Thanks!!

DeuceLiter

the sensor wires that i had listed as "PLUG IN WITH MODIFICATION" are just the same as direct plug-in, but since the sensors are located in different areas with ur nu motor, ull have to modify them to reach their nu position (i.e. make them longer)

DeuceLiter

and get a damn EX harness like he said. HX needs mods up the ***. i believe they sell aftermarket harnesses that get the job done, but y buy when u can save at a junkyard? get a civic EX harness (unless ur an electronics expert)

4gzchatch

what about the ones that need added? I don't recognize KS or IAR Sol... Thanks again!

JAPCIVIC R

ks is knock sensor and IAR which is IAB is for gsr only so you dont need to worry about the iab because your running b16, know the knock sensor that will need to be added depending on what computer you run

monicle

yeah hes right about having to change the o2 sensor wire over. But you will have to rearrange sensors and add a couple like many people have already stated. The hx harness and ecu for some reason its like the primary and secondary o2 sensor wire locations are switched. I just took both 02 wires on the harness side and soldered them together and it worked fine. plus its really easy to undo later. Just shave off the wire shielding on each one and solder them together. That way you dont cut the harness and you dont have to re-pin anything.

4gzchatch

OK, I think I've got it. Do you mean that you just join all of the wires together so that the signals go to both spots on the ecu? Thanks for all the help!

Bseriescivic5

well you are gonna need a 5-wire 02 sensor...i have one, brand new, let me know if you need

4gzchatch

I have a 5 wire and a 4 wire O2 sensor. I was told that I needed to use the 4 wire one. What's the real deal?

4gzchatch

bump... does anybody have an answer for this?

monicle

If you are doing an obd1 swap you wont need the 5 wire o2 sensor cause the obd1 ecu is only looking for 1 sensor. Use youre secondary 02 because its a standard 4 wire.

4gzchatch

so i don't have to move any pins around on the ecu connectors? earlier it sounded like guys were saying I had to mod the ECU connectors...