Ok, a buddy of mine has a std civic with the dual port system on it. And he just got a si motor and transmission the d16a6. And he has the stock std civic wiring harness. What modifications does he have to do to the wiring harness to make the si engine work considering that it is a multiport system. And anything else that would help out. I know about the computer already so anything else would be helpful.

 

MPFI swap really isn't that hard. All you do is cut like 4 wires near the ECU and run them to the engine bay. For the engine harness you need to cut off the 2 DX injector plugs and solder up some wires to it to some new injector plugs (4 of them). I did this swap the other day. The hardest part is de-pinning the ecu, other than that its easy.

This is for DX > ZC but I think the only differences is your Cylinder sensor is in the Distributor and our ZC one is on the exhaust cam.

http://hybrid2.honda-perf.org/tech/4gdxtozc.html

 

its a super easy wiring job, i dont understand why people are scared of it. i got an old wiring harness for extra pins, as they can be a bitch to get pins out of. you move 2 wires, and run 4 other ones into the engine bay, thats it. download some instructions, take your time, and it will be fine

 

I was scared of MPFI swap until I took a look at it. One day pop off your old ECU cover and take a look at that stuff and familiarize yourself with it. Once you understand the whole cutting one part, adding to another it makes a lot of sense.

 

download the instructions where they at? Or should I stop being lazy and do a search.

 

DPFI TO MPFI CONVERSION

complete intake manifold (TB, fuel rail, injectors, all sensors!)
injector resistor
88-91 Si ecu
88-91 Si distributor
and an si coolant hose to connect the manifold and the block u can use ur stock and cut it if ur cheap

its pretty easy! drain the raidiator and all then take off the intake manifold and put the si intake manifold on and rewire everything. dissconect all the plugs from all the sensors and the injectors make sure u diconnect the coolant lines from the intake and there is one bolt that holds the manifold to the block underneath u wont see it unless u know about it

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, and electrical tape(heat shrink is best).Also, when doing this conversion I would highly recommend soldering all connections and heat shrinking them. It is good to have an extra multi-point injection engine harness laying around to take plugs off of(injector plugs, injector resistor box plug, and distributor plug u can use ur stock dist plug if u cut one off another dx dist and use it to plug in but ull need a 2 wire plug for the ca sensor).

Pins B10 and B12 are empty. Unused pins can be taken from B2 or B11. Sometimes there is a unused wire 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 on the ecu into the engine compartment. Label these wires for later use.
Cut wires at A3 and A7 leave excess for later use. Run these wires into the engine bay and label them to be used later on .

Under the Hood
TPS and EACV plugs are too short and must be extended.
Be sure to switch green/white and yellow/white wires on TPS since the dx turns the opposite way.
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
the rest of the wires are color matched ur dx to the si wires

 

good info. i thought i saw somewhere a list of parts needed as a well.

 

[IMG]jpbowhunter@hotmail.com[/IMG]

 

i dunno what you were trying to do there.. but you definitely failed at it.

anywho, here's a good dpfi to mpfi writeup

http://hondaswap.com/swap-articles/d...writeup-49557/

 

thats exactly what i printed off and used

:D

 

search

 

if you're scared have someone else do it..

 

hey I'm new on this multiport/dualport swap.I have a 1990 crx dx.any i was wondering how to get a wiring diagram for it so I can do the swap si. some INFO would help thanks

 

if you look up you will see i've already posted a link to the conversion. and its dual-point to multi-point, not port.

 

thanks now I'm doing the swap on pin b12 there was white with red wire in it I move it to pin b9 it was empty is that ok? and also should I us my d15 dist. or us the d16 si dist.?

 

the wire that was in b12 is not needed so leaving it disconnected or moving it to where you did should be fine. b9 is not used for anything.

you do have to use the d16 distributor.

 

cool thanks. now using the d16si distributor it have 7 wires my d15dx has 5 stock wire so do i just double on the wires? now that with out adding the blue/yellow or blue/green

 

double on the wires? i don't know what you're asking.

 

ok sorry d16si have 7 wires d15dx have 5 so just mach them up ? oand on both dist. have 1 blue/yellow and 1 just blue know blue/green or I just have to look harder?

 

match up the 5 wires to the matching colors on the 7 pin d16 dizzy. there are 2 white wires, make sure the thicker white wire gets connected to the correct thicker wire on the harness side. you'll be left with 2 open pins and that is where you connect the wires that you ran into the engine bay earlier from c1 and c2.

 

Thanks for the INFO.a little sl

 

hey jpullen my crx is running but when i turn the ignition switch off the motor still running.SO DID I DO SOMETHING WRONG?

 

ignition wires been tampered with? ignition switch might be no good. test it to find out

http://mycomputerninja.com/~jon/IgnitionSwitch.html

 

HEY THIS JPULLEN.
i just got dun with my 1990 crx swap. took me longer then i thought because i was putting the moter in too. any way it wasn't the ignition switch i put the yellow/back wire in the wrong spot. so it eas me not the innstruction i just for got to number them.
will thanks for you'er help.
WOW next turbo sawp i'll post a pic. when i get the time

 

hey this is jpullen
my throttle body TPS was bad. I have a new one. how do I go a justting it.? and what voltage do I sat it at clouse and the max voltage at open? any help would be grate.