89redracer

I just helped a friend swap a b18a out of a 92 integra gs into his 89 CRX SI and now we are attempting the wiring. Does anyone have any pics or write-ups about the wiring? I've got the axles, front cross member cut, etc. But the wiring is what is going to kill me! A friend of mine said I should get a wiring diagram for the crx and another for the intregra. Does any of this sound right? Help!

Foreverbreathin

DPFI to MPFI writeup

4th Generation Civic Pages » MPFI Conversion

Here ya go i think that these two should be everthing you need to do the wiring...i just did it for the first time myself...it was pretty easy i think but im just a natural i guess. oh yeah if it is obd1 then you will probably want to go to hassport and get the conversion harness for the ecu..ohterwise it'll be a real pain in the ass...good luck

89redracer

Thanks! You have no idea how much this going to help!

phat87mazdarx7

DONT USE THAT INFO!!!

the crx si and the hf should already be Multi Port Fuel Injection, I bought an hf that they tried to do this in and im having to find what wire are mixed up, because #4 fuel inj isnt working and it running in limp mode. I just got a 90 si harness Im going to try today

jlicrx

the Si engine harness will not work in the HF - you need the HF engine harness

jlicrx

if you have an OBD1 engine and OBD0 car, the first thing you need to decide is whether you want to run it as OBD1 or OBD0 - in either case, use the Si engine wiring harness on the B18 - if you want to run it OBD1, you will need an OBD0 to OBD1 ECU jumper harness and OBD1 ECU - you will need to swap the Si injectors into the B18 - you will need to use the OBD1 distributor - if you want to run it OBD0, you will need to swap the Si injectors into the B18, get an OBD0 distributor and use OBD0 ECU

__________________
ZCspeed Racing

phat87mazdarx7

yeah I just found out the si haves uses different wires and a bunch different sensors,lol this shit sucks

Foreverbreathin

ok my bad i just want to say if it is obd0 then u have nothing to worry about..just use the crx harness and thats it.

Crimson_jay

I have a 91 Civic DX that use to have a DC15 swapped out for a B16 w/pr3 ecu. Will i have to use this wiring setup so that i can use the VTEC and have the car working correctly. Is my car OBD0 or is it OBD1?

phat87mazdarx7

ok this iiis whats up, the car is an hf, the guys i got it from thought it was a dx, so they did the dual point to multi port wiring hack and now the car is in limp mode. the #4 injector is not firing but all the injectors are good(swap the inj. wire from 3 and 4 and then 3 died, and 4 starts working). so it has code 16 which is fuel injector so, it throws the car into limp mode

801CRX

WTF? The HF should have already been MPFI (multi-point fuel injection). So whats the need for a wiring "hack"?

801CRX

What in the fuck is a DC15?
91 Civic= OBD1 to answer your question!

phat87mazdarx7

that what Im saying, I didnt do the dpfi to mpfi wiring, it was like that when i got it, I know the hf is mpfi, and i found out the si harness is completly different, it has way different plugs and stuff

Exodus

Wow.

Okay, there was some correct information in here, but for the most part, I'd rather just list all of the information I can think of pertaining to this topic that I know is true to perhaps help in clarifying some stuff. I know some or all may be redundant, but it'll at least be organized.

- 1992 model year starts wiring\computer language called "OBD1" or On-Board-Diagnostics 1, the first generation. Anything before that is Pre-OBD, or OBD0. OBD1's last year was the model year 1995. 1996-1997 was OBD2a, with 98+ as OBD2b. B is worthless, A is convertible.
- Your 89 CRX Si is MPFI (Multi-Point-Fuel-Injection), OBD0. The engine swap you have is OBD1 MPFI. There is a difference in the wiring between them. The difference is the industry recognized "language" or preset wire routing and plug color\type selection for the harness and connectors.
- In order to use this engine, your best bet is using the 89 CRX Si engine harness. In doing so, you may run your CRX injectors, which will match your injector resistor box. Running the OBD1 injectors will change their type to saturated, not peak-and-hold like the Si's, and will not require the use of the injector resistor box. Eliminating the resistor box from the circuitry is as simple as connecting the wires on either side of it with those that correspond on the opposite side. You would also need the OBD1 injector plugs on your harness. I recommend running the CRX Si injectors, the stock resistor box, and the CRX Si engine harness for this engine. The flow rate between the B18A1 OBD1 injectors and the D16A6 OBD0 injectors remains consistent. It's the impedance, the type (saturated or p-n-h) and the plugs\language they speak that differs. Staying true to the chassis may help ensure ease of the swap, less headaches, more simple trouble-shooting, etc.. It's in your best interest.
- You need to choose which OBD you'd like to run. Zero, or One. Your scenario may be preferable to running the stock Si ECU, which in my experience provides more aggressive results stock for stock with a B18A1, (torque steering like crazy through third and squealing versus a turd-burglar on the PR4 ECU). It will also match your chassis wiring, where as the OBD1 B18A1 ECU will have different connectors, requiring a sometimes costly OBD0-OBD1 ECU Jumper harness, which would be entirely unnecessary for your particular build. If you do not wish to run the stock CRX ECU and want to be sure you have the correct computer, try an OBD0 PR4 LS Ecu, from 90 to 91 only. Also, an OBD1 dizzy coming stock on your motor will require either a jumper harness to convert down to OBD0 if you choose to run that (or you can depin the OBD1 plugs and use OBD0 plugs, the wires are the same color and all, just different plastic holding them), or if you wish, you may use a 90-91 B18A1 distributor with your A6 CRX harness. Depinning is my favorite solution.
- You may also consider running the radiator and fan from the Integra, it's dual core from the factory whereas the CRX is single, and the inlet and outlet pipes correctly match those on the engine, so there is no need for sloppy shims or ghetto rigging to avoid coolant leaks, and you get a factory upgrade on cooling.
- Use 88-89 Integra axles ONLY. EVERYONE on the internet will tell you to run the 90-91 Integra axles which WILL allow the car to run and drive, but will cause future problems with axle binding\premature wear, increased driveline stress\friction\losses, etc... The Civic\CRX 88-91 in America is an ED chassis vehicle, NOT NOT NOT an EF, they were EFs in JAPAN and other countries. They also had optional B-Series motors not just D. In America, the only if not one of the only EF chassis is the 1G Integra (I think only the 88-89, generally, you wouldn't almost ever want 86-87 parts for reference). The outside of the axles fits the CRX splines (DX and Si!), just like the 90-91 LS axles, the insides of the axles that plug into the D-SERIES TRANS of the 88-89 Integra (D16A1, NOT B-series) also happen to plug up into the B-Series intermediate shaft and transmission, just like the 90-91 LS axles do. But the Integra of 90+ housed a B-series like EF's in Japan. So factory, they have a longer axles, by roughly an inch or so of total front chassis\suspension width. So, going down in that width to a ED chassis CRX, which needs the strut tower wall to be banged out for alternator clearance since it's chassis is about 1 inch more narrow, the axles manage to fit, but because they are for a DA chassis integra, the knuckles of the CRX squeeze the CV joints together, reducing the gap in the bearings to the housing. This causes binding under conditions like hard turns. This is why companies who sell remanufactured axles, like Auto-Zone, now sell only brand new axles, because they are cheaper than fixing the THOUSANDS of returned axles every MONTH all across the country from Honda people who choose the wrong swap axles. The 88-89 Integra may be a legit EF chassis like the JDM Civic\CRXs, but it has a D-Series motor factory, not a B, because it's american, which causes the overall chassis\suspension width to match the CRX, making the 88-89 axles the actual CORRECT length to use on a B-Series swapped EF. The only other note of axle mention would be to pry out the dust-rings on the inner side of your knuckles, it's encircles the area where your axles poke through the back of the knuckles, needle nose pliers work great, but WEAR GLOVES. On some cars, this process is a serious knuckle buster!
- As far as the emissions\vacuum nonsense is considered, I'm posting my own thread with questions about my recent B18A swap into my CRX, cause I'm having galloping idle issues and I removed the entire charcoal canister setup, and the purge valves from the firewall and plugged every non-essential vacuum nipple on the manifold. I also, don't have the dash pot on the throttle body, or the bracket of hard vacuum lines on the back of the manifold. The PCV breather box isn't hooked to a PCV valve, the tube just runs straight from one side to the other like it's hardwired. The PCV breather nipple on the valve cover has only a dump tube that goes behind the steering rack. The fuel vapor nipple on the firewall that hooks to the charcoal canister vents to atmosphere. My ECU (PR4 OBD0) reads code 43 and the check engine. Sometimes the CEL isn't on, but the code is still flashing. It's a fuel delivery code of some type, and when it's not galloping at idle, it's idling at 1250, gallops from 1-1500ish under certain coditions, but not always. When I first swapped the motor in, it had no codes and idled at like 5-800 when warm. Now it has the code and idles improperly. Usually, ECU's LEARN their situation after being disconnected from power for a while. I think my learned that it's situation is not proper, which is why it stopped running right without any changes under the hood or to the car at all.

Hope SOMEthing in there helped shed some light on your situation.

Also, there is something you might consider looking at. The idle mixture screw should rarely ever be touched, it's one of the last things you actually use to set your car's idle when it's running PERFECTLY. You may have installed the throttle cable with just a HAIR too little slack. Loosen the nuts on the cable, then by hand tug the cable with even pressure until all of the slack is gone but not moving the throttle plate\butterfly. Then with your other hand, set the rear nut so it holds it right there, without twisting it too much which will cause you to have too little cable length and be holding the plate just a hair open. Once that's set, adjust the other nut, close to the throttle body by TIGHTENING IT with the other nut being held as close to the original position as possible. Test this by flooring the pedal and making sure the plate hits WOT, you check by pressing your finger on the plate to see if it moves any more while someone is flooring the pedal. If it's rock solid, you're getting WOT okay, if the cable has neutral slack off of the pedal and is not holding the plate just slightly more open than normal, you'll have it set correctly for idle too. Your cable may just be a little too tight and causing you to idle a bit higher. The coolant sensor being changed to stock and raising the idle 900 more RPMs is what's probably a key clue here. Use a multimeter and a manual to check your TPS sensor voltage readings, make sure to reset the ECU after each change you make, and ensure your vacuum is well buttoned up and as close to stock as possible, eliminating only the unnecessary stuff and properly capping all unused ports. Go to auto-zone and look for vacuum caps where they sell stuff like oil pan drain plugs and washers, it's usually near there.

If your intake manifold gasket was bad, you'd probably be losing enough coolant to point you right to it. so it's probably not that, but you may try replacing it for benefit of a doubt.

Also, make sure to time your car, with a light, after it's warmed up (fan kicked on twice), and with your ignition advance plug jumpered (it's the yellow boot covering the misc. looking plug on the drivers side of the wiring harness behind the driver's side mount between the strut and headlight wiring. Put a paperclip in it to connect both pins, completing the circuit, and it will stop the ECU from correcting ignition timing on the fly, you have to do this to use a timing light properly, because then the light can show you mechnical timing instead of what the ECU is compensating as it runs.

89redracer

Damn that is alot of info! I'll get to work an all of this and let you know how it goes!

phat87mazdarx7

FINALLY !!!!!

Its alive and working right, the way I fixed it is kinda ghetto but I dont care it works, My #4 inj was not working, so I soldered a wire on to the existing wire and ran it straight to the ecu and it worked,lol. not it goes all the way to about 7000 to 7500rpm, and it will peel into 3rd gear and chirp up to 4th geear. Its really quick

joeybl1987

hey.. i have a 88 crx si.. and have a wrecked 92 integra.. i am tryin to put the b18 out of the integra into the crx.. im a lil new to hondas.. so does any1 have some diagrams for all the wiring? and can tell me what all i will need to put in in there... if some1 could help me id really appreciate it.. thank you

89redracer

Your 88 is an obd0 system your intregra is an 0bd1. So with that your are going to have to change the ECM and if you use the intregra injecters then you will have to bypass the resister. I am just finishing this same swap and just to let you know it will take alot of your time and money! Good luck

90lscrxsi

wow im so confused after reading all this
alright i got a ? im wondering if anyone can help me i got the obd0 b18 that was in a 89crx hf
and the body was horrible so i took it out and put it into my 90 crx si
and now that i did that it will not start im not getting fuel to 1&4 and no spark and i tried a new dizzy and spark plugs and wires still nothing if anyone can help me it would be apprecitated are the 88-89 harness's different
and do i need to switch the fuel injectors or what im so confused after reading all this someone please help me

thirteen_20

^^^^^^exactly right! I just did thi same swap. all you need to get if it is an actual Si is the original engine wiring harness from the car you are swapping into. also this is true if the motor is obd0.

B16RacerN2NR

Holy Thread from the mother-fuckin'-dead Batman!!!... Start a new fucking topic...

freak86

eh, only by a year...

B16RacerN2NR

when the warning from the admin(s) says this:


and the person doubles that time frame, they are completely stupid

efhondakid

A year, thats nothing, I found one in For Sale section someone just posted in that the last post was from 2003.

Carlos_99

somebody help please. i have a 88 crx with a b18c1 engine. i got it like that, and i have no idea how to connect the wires into the right place, i think my v tec is not connected cause the engine only revs up to 7000. and the engine is not working good until its warmed up.

i will apreciate u guys if u help me