civickid81

recently I pulled an ls motor out of my crx and now I am trying to put that motor in my 88 civic dx, The problem is when I junked the crx I junked the multi port harness and my car has the dual port harness. Now normally I would find one of the thousands of threads the show you how to convert a multi/ dual port wiring harness but the curve ball comes in with my jumper harness and what computer I am running, because I am new to Hondas I have no idea which computer I am running or how to find out and also I have this jumper harness with no markings on it except "for off road use only". Now what do I do? do I hack into the harness or jumper harness and what do I cut?

any help is greatly appreciated

crx_si-r

You can get this of you want to convert to obd1 and call it a day
http://www.youtube.com/watch?v=puPiw...e_gdata_player

civickid81

how much is that? where do i get one? and which computer do i use?. I had considered going to pick a part and robbing a harness and ecu off from a mutli port d15 . Will that work?

crx_si-r

No that will not work. If you going to use the LS computer you will need an LS (PR4) ecu from a 90-91 integra. You can also go obd1 and then use a 92-93 pr4 or a 94-95 p75 ecu

Message me if your interested or contact me via my Facebook link below

civickid81

so can i go to pick a part and pull a integra harness and ecu and will that plug and play?

crx_si-r

No. You need a harness that matches the car not the motor. Then the stock harness needs to be modified to accept the new motor

91EFH22

You probably should just go with SIR, it seems as though you should of looked at quite a few Dpfi to Mpfi then youd know what needs to be done. A pr4 ecu will plug in to your factory ecu plugs but youll need to run 4 wires as well as move 2 on the ecu plugs. I just did this on my 88 LX but if you arent mechanically inclined you should go with SIR.

lazy14

u can always get a mpfi harness from si then get a obd0 pr4 jus remember if u stay obd0 u need to keep the resistor box for the injectors

Spug

An MPFI harness from an Si wil NOT match up to the DX chassis.

If you don't know, don't post.

Canadian_EF

Your car was converted to OBD1 most likely, to accept the new computer. It won't affect doing a dpfi-mpfi swap, just remove the jumper harness and follow the directions online in the FAQ or do a search on Google.

Essentially, DPFI has 2 injectors, so you need to add wiring for 2 more injectors. Pin#1,3,5,7 on the OBD0 harness at ECU. Right now, you'll see 2 yellow and 2 red wires going into those spots. One red, and one yellow, will be ran to the new injectors. (2 wires to engine bay)

If it is too complicated, wire up the injectors as their own harness. 1 wire to each injector, join all the blk/yel wires to the blk/yel from dpfi injectors (completes the circuit). If you're gonna be running OBD1 injectors, you don't need a resistor box (looks like a mini amp on MPFI CRX/Civic 88-91)

Additional sensor in the distributor (2 more wires) will need to be hooked up as well.

That's the general idea... There are a lot of good write-ups, and, if you need ECU pinouts to figure out what pin is A1 or B12 or whatever, head to the Tech Section in Phearable.

Wiring is not that hard. Solder and heat-shrink, tape loom tape...

After you do it once, you'll be figuring out ways to make it look way better. My first MPFI conversion looks like garbage compared to my DIY tuck harness.

91EFH22

Lol a MPFI harness is not plug and play. Youd have to get the entire MPFI harness that includes the under dash and engine harness. Incorrect info my dude.

Canadian_EF

yup and cluster pinouts can be found through Google.

civickid81

im seeing alot of mixed statements. So if i get an entire mpfi harness (all the way up to the cluster) from an si. will it work with my jumper harness and pr4?

crx_si-r

No. The entire harness. Meaning from headlights to taillights. And everything in between. So you need a complete Si parts car. 90-91 is different than 88 and 89

91EFH22

I might be wrong but wont a 88-91 front harness work with any year rear (whole back half) harness? If not then damn im am a complete noob to EF's

lazy14

thats how i did my dx, the person before hacked the harness up, so i got a si mpfi n it worked fine, although he coulda changed other things also, he said he took all the parts from a 89 si minus the harness

crx_si-r

88 Si has a different engine harness than 89-91
88-89 has a different gauge cluster wiring than 90-91
89-91 have the same engine harness
90-91 have different gauge cluster wiring.

See how it gets a lil complicated. Thats why I said a complete Si parts car

crx_si-r

The reason an mpfi harness worked is because the harness had already been swapped out as you plainly said the previous owner told you. For the op it will not work as his current car is a stock DPFI car

91EFH22

Amen^^^

civickid81

ok, i dont know if this helps but the ls came out of an 89 crx and i still have alot of the parts for it in the back room. Like the cluster head lights tail lights, ect. and for the moment i am working on a limited budget.

any suggestions?

91EFH22

We posted what youd have to do. Read the writeups posted online its EASY!

crx_si-r

Those parts you listed will do nothing to help with your current problem. You need a harness that matches the body (stock or modified stock) and go from there.

civickid81

so what its looking like is i need to have some one modify my harness in my car right now ( the dx harness) to accept my pr4 and have the mpfi modifcation also.

is this correct

crx_si-r

yes

91EFH22

He can be taught. Seriously though its not hard by any means just follow the step by step directions online.