Doing obd0 to obd1 from hf to ls on an 89 crx i need a wiring guru!! What harness do i use and how do i go about it please help its my only car and my hf motor is going out on me 45% blow by on a 62 horse i cant get anywhere!! Help would be much appreciated all i need to know is how to do the wiring

 

Buy a jumper harness and make you're life easier.

 

From body harness to ecu? But will the obd0 hf harness plug into the ls motor??

 

for the most part, it will plug in - a lot depends on what year LS engine you have - in any case, swapping to OBD1 will require you to either rewire the distributor connector or purchase a distributor jumper - depending on which injectors you use, you may need to eliminate the injector resistor box - if the engine was from OBD1 or OBD2 car, you will need to rewire for the cooling fan switch and the MAP sensor (the MAP connector is not on engine harness but still needs to change) - OBD1 is also going to need 4-wire O2 sensor - going to B-series, you may have to lengthen the wires for the back-up light switch

EDIT - just noticed that title says 95 LS, so you need to make some changes to the HF harness - you still need to use the HF harness

 

You can use obd-0 injectors from an ls and they'll plug-n-play (cause obd-1 ls uses saturated injector which require no injector box), yet your hf comes with a injector resistor box cause It uses peak and hold style injectors, using the obd-0 ls injectors will make thing much easier, no wiring needed just unbolt fuel-rail install the obd-0 ls injectors and be done and just use a obd-0 Ls (pr4) ecu along with a obd-0 ls dizzy, it'll all just plug-n-play and your done, keep it obd-0 If you don't want to deal with the stress of wiring stuff up...If you still want to go obd-1 then you'd have to eliminate the inj. resistor box, you'll also be using a jumper harness for the obd-1 ecu, and jumper connectors for the distributor, this will be confusing but not too hard to tackle if you wish to go this route....just "GOOGLE" and do your research...don't expect to get spoon fed with everything, Its how all of us learned...don't forget once you swap In the obd-1 ls engine, there might be a few sensors that'll need to be added to your hf harness like on IAT and so forth on the intake manifold....good luck !

 

Map sensor wiring does not need to be changed. On this chassis it's located on the firewall and can stay where it is, or can be plugged into the map sensor on the throttle body

 

Map sensor wiring does not need to be changed. On this chassis it's located on the firewall and can stay where it is, or can be plugged into the map sensor on the throttle body

No mods need to be done to the HF harness except some extending

 

Iat is already present so no need to add it in.

 

i have everything obd1 dizzy, ecu, im buying the 2 jumper harnesses but i was just unsure it i should cut the harnesses and put the ls connectors on the hf harness or if it will plug in im also going to have it BARed so i wanna do it legit and i have done alot of research on google and www.in.honda.com which i have access to all honda/acura ETMs and repair manuals my wiring skills arent top of the line tho and so i wanted some advice from guys that have done this before im just unsure about the connectors and harness changes

 

and if anyone needs schematics i would be happy to email them to anyone

 

95 ls b18b and can i use the hf injectors to keep from eleminating the resistor box becuz they are both 240cc injectors

 

ya u can there pretty much the same, but u gotta keep the resistor box

 

so i know about the 4 wire o2 sensor are there any other connectors i will have splice in from the ls harness

 

Any other advice??

 

just take your time with the wiring. Its better to take longer and get it right the first time than having to go back and fix it.

 

what wiring are u talking about just the 4 wire o2 what else is there??

 

would have been easier if you got an OBD0 PR4 and OBD0 dizzy.... cheaper in the long run and the correct setup. All the sensors plug into the HF harness (Except the purge solenoid or w/e it is, use the firewall one you already have), so it would have been a drop in and go deal.

 

What ignition module do i use?

 

Are you aware that you will have to change knuckles to an si,ex,dx or integra? This also means new rotors,pads,calipers. The hf hubs are too small. Also you will want to purchase a hasport shift linkage. Stock hf doesnt fit to trans and integra linkage has to be cut to fit.

I just got done doing a b18a1 swap into my hf and realized its the worst crx to do an initial swap into.

 

You can use the stock hf ingnition module.

 

wrong.

in the obd1 LS distributor you can use the module from any of the following cars:
92-95 civic (any model)
92-95 integra (b18a1, b18b1, b17a1)

94-95 GSR has a different style module (different bolt pattern)

 

My apologies lol I was thinking of my swap with a 91 ls not a 95.

 

you can use your same harness. just de-pin the distributor plug and put in the obd-1 plug and the same goes for any other connector and the map will connect on the throttle body. i m running a 89 dx to 94 ls that way and u can take out your resistor box and use the common ground block from the obd1 ls

 

your almost correct. the 2 pin connector on the distributor will not be as easy as the 7 pin connector. the obd0 and obd1 2 pin connector have different terminals which wont swap over as easily.

and the ground block you referring to is actually a power source. you dont have to swap out any other connectors, they will plug in just the same.

 

hey im ganna drop a 96 b18b1 in to my 90 dx hatch dpfi does any 1 know were i casn find a wire up diagram for the fuel injectors , and wat i would have to do to the wire harnes for it to work i have a jumper harnes already

snything would help