i have an 88 crx si and a 93 civic si HB and i am converting my crx to OBD-1, what problems am i going to run into??? theres already a OBD1 motor in it and if i re-wire the cluster and climate controls and the dimmer, hazards blah blah blah, and i cut the harness near the gas tank and just connect it to the igisting crx harness will i be ok? any codes? any help would be great, thanks

 

ok, let's mke sure I understand. You have an OBD-I engine in your 88 CRX Si, an you're currently running OBD-O, right? To convert to OBD-I, you DO NOT swap te wiring harness. Yo simply modify the CRX Si harness. You will need to buy/make a converter harness to plug into your existing OBD-O harness on the ECU side, and you'll have to do stuff like move the coolant temp sensor and MAP sensor wiring, etc etc. Do a search, I've posted many times on this.

 

thad be storminmatt but its easy to buy a harness from blown90hatch who makes a conversion harness to run the obd1 ecu on a obd0 car i made teh harness myself with a post matt made on teh crxresource

 

i did this swap in my crx......obd0 to obd1 if u have any questions u can email me a slic187@aol.com

 

I guess you can see now that changing the entire harness is not the way to go. And you don't need to deal with this madness. All you need to do is adapt the existing harnesses to run the newer motor, changing only that which needs to be changed. Specifically, you will need to change the ECU plugs to run the newer ECU. You can do this by either making an adaptor harness using a set of 1992-1995 ECU plugs and an old 1988-1991 ECU. Or you can cut the 1988-1991 plugs from your harness and solder on 1992-1995 plugs. The advantages of the first mithos are (1) better working conditions (less cramped), and (2) it is easy to change back. But cutting and soldering produces a cleaner overall job and moe secure connections. If you do decide to cut and solder, cut one wire at a time to avoid confusion and mistakes. You can check my wiring guides at the hybrid forum of resource.crx.org. There are two charts: one for MPFI cars and one for DPFI cars.

The changes required under the hood are pretty much limited to changing plug where required, rerouting some wires, and adding a few. The hardest part of this job (in my opinion) is unwrapping and rewrapping the harness. Again, I have guides posted on the hybrid forum of resource.crx.org.

 

thanks for everybodies help, i am going to work on it like a mad man today and if i get ahold of a digital camera today i will post pics.

 

make sure to remove your injector resistor pack if you haven't already done so. the car will run with it still in there, but it won't run well and you'll kill your injectors.

sorry, i meant to include, if you switch your injectors to the ones that come with the z6, make sure to remove the injector resistor box.


[Modified by serious, 1:50 PM 7/16/2002]

 

I haven't verified this, but I've heard that you can run the injector resistor box and 88-91 injectors on the P28 with no problems...I repeat, I have NOT verified this though. I am running the OBD-II D16Y8 injectors off the P28 with no problems.

 

yes you can "theoretically"....this is the same principle why people use the dsm injectors and a resistor box with their obd1 or obd2 cars. However, for optimum performance of the p28 and an sohc motor the obd1 injectos should be used.

 

i'm going to be using an entire p28 harness and all the p28 sensors all the way back to the fuel pump, i don't think i should have any problems. it should be the same as a stock obd1 si car right???

 

well, if you change the entire wiring harness on a car then it should be just like the harness of the car you took it off from, but GOD!! why would you go through the pain of that?

In any case, if you have the patience and the time then go ahead and do it.......it takes a certain type of person to do this, and it is certainly not me, specially for a street car.

later,
L.

 

why would u do that ur gonna have to change alot of things to use teh harness in the driver compartment ur dash harness wont just plug into the ef like it does in the eg like i said before a conversion harness is easier to do unless ur dead set on using the harness from the eg witch isnt as easy

 

The BIG problem with using entire harnesses is trying to interface it with all the stock CRX stuff. Don't think all the dash stuff, HVAC stuff, and underhood stuff is just going to plug right into the 1992+ harness. And don't think that the plugs are all going to have the right wires or even be in the right places. Because they most likely won't be. Do yourself a HUGE favor and just modify your existing harness to run the stuff.

 

I will VERIFY that you can run the OBD0 injectors granted you use the resistor box as well and the OBD1 ecu/electronics and it will work 100% ok. TEsted and been proven.

Jason

 

It does work. But I am not sure that performance is 100% up to par with using the proper injectors.

 

a few ?'s-if you use obd1 injectors you have to remove resistor box right?-where is that located approx? will obd0 injectors work in a z6 intake manifold? and does either generation injector (obd0,obd1) have an advantage over the othe (ie. injector size)?

 

i'm using a JDM DC-2 cluster so thats not a problem, and i had a GSR dash in my crx before and i wired it so everything worked so i don't think this will be that big of a problem.....i have done wiring on many hondas and i think that i will be ok, but when its running right and everything in the interior is working right then i will post pics to show everything that was done to make it work.........hopefully i will be done tomorrow but i have been working too much.......