Can i just modify the dpfi harness i have now to a mpfi or do i need a whjole new setup, i need a new ecu right?

 

You can modify the exsisting DPFI harness for MPFI, just have another harness available that you can scavenge the plugs from. Yes you will need a new ECU.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Layziebtnh055 &raquo;</TD></TR><TR><TD CLASS="quote">Can i just modify the dpfi harness i have now to a mpfi or do i need a whjole new setup, i need a new ecu right?</TD></TR></TABLE>

You also need to use the search feature on this board..

 

my man tiresmoke wrote this:

these are my simplified instuctions less cutting and soldering.
Installing a B16A into 88-91 DX Wiring

Converting DPFI to MPFI

Unpin C1 à repin B10
Unpin C2 à repin B12
Unpin B2 cut add wire to go to the BLU-GRN wire on cyl position sensor then
repin C1
Unpin B11 cut add wire to go to the BLU-YEL wire on cyl position sensor
then repin C2
Cut A3 and add wire run it to #2 injector (RED wire)
Cut A7 and add wire run it to #4 injector (YEL wire)
Connect the YEL-BLK wire from the DX injector harness to the YEL-BLK wire
on the injector resistor box.
Connect the YEL wire from the DX injector to the #1 injector (BRN wire)
Connect the RED wire from the DX injector to the #3 injector (BLU wire)
Connect the 4RED-BLK wires from injector resistor box to each injector


The car is now MPFI

Setting up the Vtec

A8 add wire for Vtec Solenoid valve GRN-YEL
B5 cut add wire for the Vtec pressure switch BLU-BLK wire
B19 add wire for Knock sensor RED-BLU
C8 cut add wire for second O2 sensor WHT (green plug)

The TPS has to be extended about 10”
The IACV has to be extended about 5"
The distributer plug has to be un pined from the Dx square plug and repined
to the B16 round plug. (do this one wire at a time, matching the wires
correctly.) There should be 2 extra wires left on the B16 round plug these
are for the wires coming from ECU pins C1 and C2.

good luck, he's right it's easier than cutting and soldering method. Also, if you're swapping different obd I suggest you buy the conversion kit.

 

Some little things I see in here that could be changed but overall a good writeup on mpfi swap..

If your wondering, alot of people that do like a mini-me setup on a crx will just use a rpm switch to wire up the vtec.. In that case you dont need a extra o2 sensor wires or a vtec pressure switch to make the vtec work, Nor do you need a knock sensor.. What he said would be the case if you were going to use a jdm obd0 ecu or conversion to obd1..