i have just swaped over my dx hatch to a d16 i have the resistor box and everything aswell as a full parts car that is a factory si...

on the si harness right were you plug the engine harness to the ecu harness...
there is 3 plugs on the si and on the dx harness there is 2

can anyone clear this up and also help me with the plugs where the resistor box wont plug in...
i have got a pic of the extra plug and circled it


the dx is a 91
and i beleve the SI is a 89
I DONT have the DX harness and need to make the SI one work

 

Are you trying to just plug the Si engine harness in and make it work?
It won't.

You have a bit of wiring ahead of you to get this done - not really worth it.
I suggest you just mod your DX harness and be done.
Follow the write-ups on this - basically you swap an ECU pin or two and add wires for the two new injectors. Adding the Resistor box is easy.

 

first off, are you using and obd0 to obd1 conversion harness for the new ECU? if so the resistor box shouldent be nessisary due to the fact that the ECU is programed for those style injectors already. This is a d1.6vtec obd1 engine right? if so then ditch the resistor box and just like 4dref said, use your original harness. make the additions and provisions that you must there pretty simple. and take your time dont use butt conectors when you can run new wire do it right and with pride man. any questions let me know!! good luck!!!

 

oh snap you gotta get those service manuals out if you aint got the harness, and my bad i see your d16 is obd0 so keep the resistor box MY BAD!!!!

 

You guys are jumping way ahead of yourselves... DXs came with DPFI so first off he can't just use his factory harness and add the vtec sub-harness....
You're going to need to convert to MPFI if that was your intention.. My STD came with 3 ECU Plugs your ECU has two sockets but two plugs go into one socket.

Oh, and when you do your MPFI swap don't crimp the wires you have to solder then and heat shrink them.

 

well i better clear this up a little ...it is a stock d16a6 non vtec 0bd0

i picked up the DX a year ago and it had a b16... was complatly hacked up...the kid tried to re wire the whole harness lol ..
and it was beyond repair ... wish i still had it now tho ..
what can i do

 

Go and get a DX engine harness. Convert to MPFI. Not that difficult.

Making that Si harness work in the DX is possible, but DON'T try unless you have a lot of time, skill, and references(a stock dx harness to compare to, wiring diagram, etc...)

 

ok one more question will a 90-91 dx engine harness work on my 88 si d16a6 engine?
and if not what will i have to do to make it work beside the mpfi converson?

 

for a si harness to work on a dx youll need to switch out the whole cabin harness which is a pity

now for a dx harness to work for on a si harness its not possible unless you modify your dx harness. you cant mix and match harness since the the connection on the shock towers are different you can make a si harness by finding out what each pin on the shock tower goes to and wiring it like that but it is to much work you'll be better off just getting an si harness

 

ok so i should just get a 90-91 si engine harness... the wire harness in the cabin is to much work and i only have a few weeks to get it finished before i move to florida ... but will that 90-91 si work for the 88 si engine?

i heard something about the fitv or something being diffrence

 

These people are being confusing, I'm not sure why as this is a VERY common simple thing you're doing...

Since you don't have the origonal harness for your car buy a harness for your car that is exactly what would've been in it a DX harness if possible a 91 DX harness but AFAIK any DX harness will do. This will plug into your chassis harness without any modification. Next convert it to MPFI. Now that your DX harness is MPFI it will plug right into your MPFI D16A6 Si engine.

 

seriously its really that simple....


btw, what ecu are you using? pm6 i hope if you are going to be obd0 with an si harness.

 

http://hondacrx881.tripod.com/mpfiswap.html

 

I have a harness for a dx to obd1 sohc vtec fully plug and play to a p28 and your set...
Came out of my friends dx crx with a zcvtec

 

there you have it....

 

ok now.. the d16a6 is from a 1988... will a 1990-1991 SI wire harness plug in ok?

 

Oh good grief.
I was pretty clear on how to do this ... I am totally confused why anyone else replied, but it's confusing.

Read this - it's 100% true to get an A6 motor running in your DX chassis.
These are your options:

USING A preOBD (OBD0) ECU

1) DX cabin harness + DX engine harness
Search for DPFI to MPFI conversion for wiring mods - this is the BEST choice for your situation!
2) Si cabin harness + Si engine harness
3) DX cabin harness + LOTS OF WIRING MODS + Si engine harness

Don't even consider buying the OBD1 harness.. you do NOT need that for your stock A6.
You can add a Z6 or Y8 vtec head to your A6 motor in the future and THEN you consider the OBD1 conversion, but you will STILL need to have done the above MPFI conversion.

Now lock this thread before some other foolio misguides you.

 

hey thanks.. yea i was planning on just getting a dx harness and do the mpfi my self..
i have a pm6 ecu aswell ..

i wasnt gonna go do the obd1 conversion i just looked right past that lol
im not new to honda just never delt with a stock engine.. i normally swaped as soon as i got it for a b16 or gsr..

i was just wondering about the 88 engine if the 90-91 dx harness will work ... i remember hearing someting about the fitv or something being diffrent or not that... dont quote me on that im not sure

but ill just get a 90-91 dx harness and convert it ... thanks

 

im also doing this conversion right now and you do have to have all the same year harness. that one guy was correct it is easier to just use your stock harness but i couldnt do the wiring so i just bought 90-91 si engine and sud cabin harness. 88-89 aren't the same as 90-91

 

this should help a little

In order to convert your dual point injection DX to multi-point injection you will need 4 injector plugs, an injector resistor box, extra wire, a wire stripper/cutter, heatshrink and/or electrical tape, and some patience. Also, when doing this conversion I would highly recommend soldering all connections and heatshrinking them. If you do not have access to heatshrink neatly wrapped electrical tape will do just fine. It is also extremely helpful to have an extra multi-point injection engine harness laying around to take plugs from (i.e. injector plugs, injector resistor box plug, and distributor plug). Listed below is a straightforward and easy to follow set of instructions to help you complete your DX to Si manifold swap.

Inside car @ ECU

Pins B10 and B12 are empty. Unused pins can be taken from B2 or B11. Some models have a wire located at B12.

Cut orange and white wires off at C1 and C2 and connect them to wires added at B10 and B12. Orange-B10. White-B12. Leave enough wire for next step.

Run wires from C1 and C2 (direct ECU connection) into the engine compartment. Label these wires for later use.

Cut wires at A3 and A7 leaving plenty of wire. Run these wires into the engine compartment and label them for later use.

Before installing manifold

TPS and EACV plugs are too short and must be extended.

Be sure to switch green/white and yellow/white wires on TPS

Injectors and injector resistor box

Connect the yellow/black wires from the two DX injector harnesses and run it to the yellow/black wire on the injector resistor box.

Connect the yellow wire from the DX injector to the #1 injector (brown wire).

Connect the red wire from the DX injector and run it to the #3 injector (blue wire).

Connect the A3 wire to the #2 injector (red wire).

Connect the A7 wire to the #4 injector (yellow wire).

Connect the 4 red/black wires from injector resistor box to each injector.


Cylinder position sensor

Connect C1 to blue/green wire on cylinder position sensor plug.

Connect C2 to blue/yellow wire on cylinder position sensor plug.

These wires are off the si distributor so connect them there.

Thats it. Double check everything and start it up. Good luck!

 

i tried the same swap. 89 dx to a 91(a6) si but the harness was already hacked by the previous owner so i'm still looking for a dx harness. but i heard if you go to hasport's website you can order one with the conversion done already. then it's plug and play