Okay as I'm writing this my frustration level is in the upper side of the scale, just a few ticks beneath grabbing some kind of a scoped weapon and climbing a ****** clock tower. Here's my problem, I am doin a b series swap into a dx civic. The mechanical part was a cinch no problems but the wiring has got me completely twisted around. A friend of mine said that he could handle the wiring, it woul dbe easy he said, so I put my faith in him to do it, well he fucked things up, just a complete hackjob. So I scrapped his "harness" and bought one from a crx si, which from my understanding should just plug right in and eliminates the whole dpfi to mpfi issue. So as I'm putting in this harness everything goes pefectly into place except for the plug that goes near the drivers side shock tower, which doesn't fit and has a different number of pins in it. So my question is were the wiring harness's different for the 88-89 than for the 90-91? If so which one should I use? Or if any one has any other ideas throw em at me, I'm sick and tired of being frustrated with thius car

 

OMG who the hell told you that you could use an si harness on a dx? you are so wrong you still need to convert it over from dpfi to mpfi also just spend the damm money & don't be a cheap ***
get it done right!!!
http://www.rywire.com

 

so I can't use the si harness from a crx in lieu of the the mpfi swap? Hmm every thing i've read though has said that using an si or an hf harness would work and save me the effort of adding the two other injector wires that the dx lacks...... I've found a ferw other things on hyere that may be helping me out some, there is a pretty good write up I found about doing the mpfi swap

 

well show me where you read that crap so I could post & say that they are all moron's and have no business driving a honda

but trust me dude just spend the money & get the harness done

 

wow ive done the sawp 5 time or so and its not that hard change two wires on the tps and then change the two wires in the dizzy and the ur two injector wires to the pass side harness then ground to the injectors and ecu b10 to c2 i think those are the right ones

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hamstr323 &raquo;</TD></TR><TR><TD CLASS="quote">well show me where you read that crap so I could post & say that they are all moron's and have no business driving a honda

but trust me dude just spend the money & get the harness done </TD></TR></TABLE>

What?

If he is swapping the motor and ECU, and the harness, why would the Si harness be a problem? It takes care of the MPFI swap for him, that's the point.

Anyway, to the OP, there are a couple of plugs over there that go to the resistor box, which you need for OBD0 injectors. IDK if they are different 88-91, but you will need the appropriate resistor box for the plugs, if you are using OBD0 injectors.

 

the si ahrness will work fine.ull need to wire the kncok snesor and vtec **** for it.u can get them plugs off the old b16s harness and just wire it right to the ecu.ull also need the si injector box too.it will plug right in the si harness

 

come on people. dont confuse the guy.

the reason the shock tower plugs do not line up is they are different from si to a dx.

the way the swap is meant to be done is like this.

1) install the engine. (which you did)

2) then modify the exisiting DX harness (interior and engine) to allow for MPFI (its not THAT hard, really)

3) then you add the 4 wires for the b16a. vtec, knock, oil pressure..... (this you have to do no matter what crx you have, si, hf dx whatever)

thats it. its a simple 3 step thing. if you stray from this, it causes headaches.

unfortunatley you have an engine harness with main clips that differ in SHAPE and PIN LOCATION from your cars interior harness.

your interior harness is also what plugs into the ecu. which is why you just keep everything stock, and modify that.

just buying an SI engine harness is not a magic fix, since the interior harness wont have the extra pins anyway, it wont have those 4 wires for the b16, and it doesnt line up with DX shock tower plugs AND while were on the subject, 88-89 is different from 90-91 as well.

<u>i wish kids would stop telling others to do this. its really bad misinformation.</u>

now you know why.

i dont mean to get all negative on you though, that was more for anyone who might see this thread with the same problem. for your case, if you cant do it, you migth want to take both you DX and SI harness, put them both in a box, and send them out to rywire.com, or jkodb.com and tell them what happened. they will combine the two and send you a perfect working one, for a fee of course. then you just add the pins at the ecu, and your done.


Modified by doublethink at 11:17 PM 5/7/2006

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by downest &raquo;</TD></TR><TR><TD CLASS="quote">

What?

If he is swapping the motor and ECU, and the harness, why would the Si harness be a problem? It takes care of the MPFI swap for him, that's the point.

Anyway, to the OP, there are a couple of plugs over there that go to the resistor box, which you need for OBD0 injectors. IDK if they are different 88-91, but you will need the appropriate resistor box for the plugs, if you are using OBD0 injectors. </TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vteckillenzc &raquo;</TD></TR><TR><TD CLASS="quote">the si ahrness will work fine.ull need to wire the kncok snesor and vtec **** for it.u can get them plugs off the old b16s harness and just wire it right to the ecu.ull also need the si injector box too.it will plug right in the si harness</TD></TR></TABLE>
OMG please don't post if you don't know what the expletive you are talking about
YOU CANNOT USE A DX CABIN HARNESS & USE AN SI ENGINE HARNESS & THINK THAT WILL FIX THE PROBLEM!!!!

THE GUY ABOVE EXPLAINED IT PERFECT

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hamstr323 &raquo;</TD></TR><TR><TD CLASS="quote">

OMG please don't post if you don't know what the expletive you are talking about
YOU CANNOT USE A DX CABIN HARNESS & USE AN SI ENGINE HARNESS & THINK THAT WILL FIX THE PROBLEM!!!!

THE GUY ABOVE EXPLAINED IT PERFECT </TD></TR></TABLE>


I NEVER TOLD HIM TO USE A DX HARNESS.BUT W/E I KNOW WHAT WORKS CAUSE I HAVE DONE SAME THING AND IT RUNS FINE.SO WHATEVER U CAN DO U WANT ITS YOUR CAR.IF U WANT YOUR HARNESS TO LOOK ALL CHOP UP GO FOR IT.

 

wow, go away for a day and people actually give me helpful information. cool. So the consensus seems to be that I should just go ahead and use the dx harness, and modify that for mpfi, which basically is just a matter of running the injectors into the resistor box, what about at the dizzy though? will there be much work involved in wiring the b16 dizzy with the dx harness? Have there been any previous posts on the whole mpfi conversion on this forum?...... wait dumb question I'll just look it up ........ If I were to use an ef si harness which one would be my best bet? the one for 89-90 or the one 90-91? One thing I've learned from this whole frustrating experience though is that trusting your friends when the say they know how to do something = expletive friends, strangeres for ever!!!!! lol

 

use 90-91 si harness.dizzy will plug right in.just remember solder all your connections.and use heat shrink.well worth the time.most if it u can wire out of the car and then put it in.

 

will it plug into the shock tower though? because the harness from an 88-89 si won't .......

 

what year civic do u have???

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vteckillenzc &raquo;</TD></TR><TR><TD CLASS="quote">use 90-91 si harness.dizzy will plug right in.just remember solder all your connections.and use heat shrink.well worth the time.most if it u can wire out of the car and then put it in.</TD></TR></TABLE>

Whatever you do...DONT listen to this guy. What hes telling you to do will be so much more work. Its really an assonine statement.

The plugs on the Si harnes will not work with the plugs on the DX shock tower.

Listen to doublethink. Thats how ive always done them and ive never once had a problm. And its easy as pie. Good luck man

 

well i never had a prob doing it like i have it.and i of coures your going to have to mdify it.i was tlaking bout reping it for si clip but w/e

 

stick with your STOCK DX harness and modify it in stages.

1. modify it to MPFI
2. modify it (or just add the wires) for vtec and other related sensors on the b16

 

I have an 89 dx....

 

get the si clips for the shock tower and repin the repin the dx wires.the helms will have the pin-out for it.

 

awesome..... you know what I'm learning from all of this? I'm learnin that next time before I let a friend start hacking away at my wiring harnesses, I need to make for damn certain that they know what they are doing. That and that in the future I'm gonna look at things and see if I can handle things myself, because looking at all the things I've found online about doing the mpfi swap, it's not very difficult, so next time instead of letting myself be intimadated into letting someone else do something, I'm just gonna grow some ***** and try it myself.... because this mpfi swap is pretty basic just hope that nothing was moved at my ecu plugs..... that would suck.......

 

okay something else real quick.... would I be right to assume that on 88-91 would use the same color wires in the same spots? I wanna go ot the junkyard and look at the ecu plugs on another dx to compare and see if all of my wires are in the right place, but would another dx ecu have the same color wires at the same spot?

 

that i really woulnt knbow off hand.i know 90 91 are the same and 88 89 are the same.like i said the helms manual could tell u better then i can.

 

You have to use the DX harness. You should always use the harness that came on the car and modify it to fit the motor that you swap in.

This should help you, http://crf50.no-ip.com/fourthgenhatch/mpfi.html

 

no ****!


USE DX HARNESS WITH REPIN FOR SI CLIPS.come opn guys this is honda 101 **** here.

 

Yeah found a chart from the helms manual that has all the pinouts and wire colors, so that's gonna be a huge help to me tomorrow, Maybe even finally have this bitch running tomorrow finally