spartan_chaz

I am looking at putting a B16A into my 88 CRX HF. One main question i have is if i get the engine with the wire harness whats stopping me from just using the harness off the engine i get? I will also be getting it with the matching ecu so i just want to know if i can use everything that goes with the engine rather than have to buy other stuff to get it to work. If not what will i need to get? the wiring is the only thing that confuses me about that swap.

smilindave

Do some more research, see sticky section, save time and trouble.
Regards
Dave

spartan_chaz

I have read the article. Question i have is the OBD0 to OBD1 harness adapter that places sell make it so you don't have to wire anything yourself?

HondaPartsHero

What adapter harnesses do you have? You'll need a little more than that.

spartan_chaz

I haven't gotten anything yet i am in the planning stages for now. I want to make sure i have everything down packed before i start buying stuff.

baller status

What's stopping you is that the harness is RHD and your car is LHD. So most people modify their stock harness.

smilindave

There is NO prebuilt wiring harness to facilitate this swap. I you are not prepared and confident in your in your to perform the task at hand, simly go as far as you can and ask for help from someone more confident in wiring. Not bashing, merely suggesting that you try, do your best, when stuck then ask for help. Its how I learned how to do things and as more information has become available, I read a lot about things I might be interested in before proceding. I have done 2 of these and 1 is my daily, I am 53 years old and derive a great deal of pleasure from driving these cars. They are a good, cheap fun car. Be advised that they can eat money like any project, so shop wisely, buy the best you can afford, if you cannot afford a good quality item save your money till you can(don't cheap out, you won't satisfied with the outcome). Good luck with your project. There will always be something that is not a bolt in. Just be glad this is now, I had to make a lot of stuff with my first project. Remember to take your time, there is no instant gratification with a hurried failed project. The first one took me about a week ( not 8 hrs a day approx 4 per day). The second took a steady 3 day weekend.
Regards
Dave

spartan_chaz

OK thats what i needed to know. Then, the real question is what do i need to modify exactly?

This issue is not doing it i have confidence in wiring iv done swap on other cars that were significantly more difficult than hondas. I just dont know what exactly to do for these cars.

smilindave

READ the sticky FAQ, everything you need to know is there. If by some chance the info is missing, use a well known search engine called google.
Regards
Dave

spartan_chaz

I have read up alot but somehow i am still confused. Iv read through a few guides but nothing has been detailed enough for me to understand. I will say it may make sense to others but to me i have found my definitive answer. I am a person who reads alot before i do something and somehow i am still here asking. If someone knows and can tell me exactly what i need to do for wiring would be greatly appreciated!

jlicrx

first off - is the engine /ECU OBD0 or OBD1? - if OBD0, you just use your existing HF engine harness (it plugs right into everything) and add the necessary wires for VTEC, second O2 sensor and knock sensor from the ECU to the engine - if you are running OBD1, you still just use your existing HF engine harness and purchase an OBD0 to OBD1 ECU jumper - you need a jumper that has the added wires for VTEC, 4-wire O2 sensor and knock sensor incorporated into the jumper - makes it a lot simpler than trying to add the wires - if the engine is OBD1, you will also need to change the wiring on the HF engine harness for the cooling fan switch - the OBD1 engine has the switch on the thermostat housing and the HF engine has the switch on the back of the block - the OBD1 engine also has the MAP sensor on top of the throttle body where the HF had the MAP on the firewall - you would need to extend the 3 wires for the MAP sensor connector and plug it into the MAP on the throttle body

the biggest reason for not using the engine harness that comes on the engine, if it is OBD0, is that the HF chassis harness wires at the firewall connectors are all in different locations in the chassis side of the connector from where they are in the engine harness side of the connector - for instance, the igniter wire in the HF chassis harness is in the driver's side connector but is in the passenger side connector in the B16 engine harness

spartan_chaz

Ok thanks for the info. To answer your questions:

1. The engine i would be looking at getting is OBD0 as well.

2. you talking about the VTEC, o2 sensor and knock sensor. So the ECU will have all the spots i need i will just have to run the wires to each sensor from the ecu and that should be all i need for wiring?

jlicrx

yes, that is it

wire from A8 to the VTEC solenoid
wire from B5 to the VTEC pressure switch
wire from B19 to the knock sensor
wire from C8 to the second O2 sensor

you will have wires in the chassis harness at B5 and B19 which you won't need as they concern the electric load detector which the B16 ECU won't be looking for - unpin them and run new wires to the engine bay

since you have an HF, you need to cut the wire that goes to ECU pin B9 - this wire was for a back up lights signal to the HF ECU and will cause you problems with the B16 when you shift it into reverse, if you don't cut it

spartan_chaz

Awesome! thanks a ton for the info that helps me out alot!

And just one last question for ya. As for putting a header on the engine...I have a header currently and the o2 sensor was relocated behinda the engine. Its running odd and im sure its due to the fact that the sensor isnt getting hot enough at low RPM. Can i wire in a 4 wire heated sensor with OBD0? That way i can go ahead and do it so its ready for when i get the engine ready to swap.

smilindave

That O2 setup will only work with OBD1. With OBD0 you have to run the 2 single wire setup, the ecu won't recognize the sensors and will throw a code. After you convert to OBD1 use the single sensor. Search for a thread by Fremanana regarding the complete wiring of the swap.
Regards
Dave

spartan_chaz

Thanks for the info! i really appriciate it!

As for my current engine i guess i will have to find a way to get the o2 sensor issue fixed on my stock d15 so it runs correctly till i can get everything together for my engine swap. I may now be considering getting an OBD1 engine set up to make things easier in the long run.

Glowicki

I believe specifically for the hf, you have to swap out the front hubs. I want to say that you have to swap in hubs from either an si or a dx. Because the splines in the hf hubs are too small for b series axles.

spartan_chaz

That is correct. I plan to order my motor from hmotorsonline and they will sell it with the integra knuckles and hubs which will work to give me the hubs i need

zrickety

iTrader: (1)

Yeah use as many integra parts as you can. They are bolt on upgrades all day.

slowpokesi

All that you should need to know is here...
https://honda-tech.com/honda-crx-ef-...guide-1193782/

I even went back and fixed most of the pics!!! Goodluck.