is it possible droppin an 89 si motor in a 90 hb by using the jus the si complete engine harness including the resistor box and ecu and pluggin it into the 90 dx car harness? im talkin about the plug connector thats under the hood rite by the firewall on the driver side were the resistor box is located.

 

it wont work. you either have to rewire the car harness to an Si plug or rewire the engine harness to the DX plug. either way its a lot of work. it would be easier to use the DX engine harness and rewire for MPFI and the dist wires. But since it is an 89 engine in a 90 car it will be illegal. only same year or newer engines are legall.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 91civicLX &raquo;</TD></TR><TR><TD CLASS="quote"> only same year or newer engines are legall.</TD></TR></TABLE>

that's only in California and other select places.

 

damn i didnt knew that? but anyways i have the engine harness and the full interior harness. i should jus use that instead. coz i taught would be easier to do the wiring thing but i guess not, im not good in rewiring things anyways thanks.

 

convert the DX harness to multi point and sell your Si harness on ebay, you should be able to get lie $50+ for it

 

DPFI to MPFI is cake. You only have to run 4 wires to the engine compartment. The wiring inside the car should only take about 15 minutes to do. Swapping the entire harness is not worth the time. If you get an Si harness your only looking at 30 minutes of wiring.

 

just buy the conversion kit i rewired my whole car worse thing ever

 

well i got every lil harness there is on my 89 si hb from engine to under the dash with the fuse box and all the way to the fuel pump and rear lights. do u think is still worth swapping the full harness .......... i know i didnt cut anything jus disconnected what needed to be disconnected... and pulled it out from the car what do u think should i do

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dasnotjdm &raquo;</TD></TR><TR><TD CLASS="quote">well i got every lil harness there is on my 89 si hb from engine to under the dash with the fuse box and all the way to the fuel pump and rear lights. do u think is still worth swapping the full harness .......... i know i didnt cut anything jus disconnected what needed to be disconnected... and pulled it out from the car what do u think should i do </TD></TR></TABLE>

It takes a lot of time to run the entire interior harness. The MPFI conversion should only take a few minutes. Pins A3 and A7 need to go to the engine compartment. These are your other 2 fuel injectors. Cut wires C1 and C2 off at the ECU plug. Cut wires B10 and B12 off at the ECU plug. Leave enough wire to work with on the plug side. Connect C1(from engine side) to B10. Do the same for C2, run it to B12. Extend and run C1 and C2 to the engine compartment. They will go tot the blue/green and blue/yellow wires on the Distributor or exhaust cam on a ZC swap. All this should only take 15 minutes.

 

no dont do it dude i just did it the thing isnt plug n play you have to break out the soldier iron.all the plugs are different

 

no what im trying to say is the interior harness i got on my dx hb is coming all out including the engine/engine harness. and what im doing is putting in the 89 si harnesses into my 90 dx hb without cutting anything im not keeping any dx harness in the car or the motor..coz i got the the all the si harnesses to put in my dx so there shouldnt be any problems rite. or am i wrong .....

 

You're going to have to change out so much wiring, and take apart so many things to get to the wiring (the entire dash for example) that it would be <U>MUCH</U> easier to just do the mpfi conversion!

 

well i already did the interior swap so might as well do the harness also lol and like i said im not good in cuttin and rewiring things lols........ i dont like to redo things especially if i make a mistakes on the harnesses.....

 

Its only 4 wires. It's easier than installing a deck. If you don't plan on cutting any wires don't ever plan on swapping a B series or D16Z6 either.

 

hmm....i did a z6 in my other hatch i didnt need to cut anything everything was jus plug n play the only thing i used for the dis was the 91 si dis? everything else plugged rite in...so far no problems. as for b16 havent done that yet but soon.......

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dasnotjdm &raquo;</TD></TR><TR><TD CLASS="quote">hmm....i did a z6 in my other hatch i didnt need to cut anything everything was jus plug n play</TD></TR></TABLE>

How did you get VTEC to engage?

 

for my vtec angagement i used a the fields vtec controller