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Obd0 DPFI to OBD1 MPFI conversion.

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Old 01-25-2012, 02:05 PM   #1
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Default Obd0 DPFI to OBD1 MPFI conversion.

OK. Here's my dilemma. I have a 91 Dx that is stock d15b2 with DPFI OBD0. I have a whole D16z6 swap with full engine harness, OBD1 distributor and p28 ecu. I pretty much know How to do the MPFI conversion with all odb0 parts, but I am confused about what to do if I want to convert to MPFI and Obd1 at the same time. As I said before, I have all of the necessary obd1 parts even the obd0 to 1 ecu jumper harness. I know when doing the z6 swap, ill use the z6 distributor plugs and injector clips off of the z6 engine harness and attach them to my stock DX harness. I am confused about which wires to put Where since I'm going to obd1 right away. Is it any different from the wiring pinouts from the obd0 MPFI conversion? If anyone can help me out, I love you long Time. Thanks.
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Old 01-25-2012, 02:49 PM   #2
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Default Re: Obd0 DPFI to OBD1 MPFI conversion.

Bump... I need an answer to that A.S.A.Frickin'.P.!!
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Old 01-25-2012, 03:07 PM   #3
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Default Re: Obd0 DPFI to OBD1 MPFI conversion.

Do the mpfi swap first then do the obd1 swap
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Old 01-25-2012, 03:42 PM   #4
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Default Re: Obd0 DPFI to OBD1 MPFI conversion.

So basically, your telling me to spend another 250+ dollars on an obd0 ecu, distributor, injectors, distributor plugs, resistor box, and resistor box plugs all just to hook up a few wires... I find it hard to believe that someone hasn't done What I am asking...
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Old 01-25-2012, 03:45 PM   #5
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Default Re: Obd0 DPFI to OBD1 MPFI conversion.

no do the wiring for mpfi then get a obd0 to obd1 ecu jumper harness and maybe the dizzy jumper plug to use the dizzy fron the z6 if you wanna use the obd1 injectors when you add the wire for the resisor box wire them all together to eliminate the resistor box
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Old 01-25-2012, 04:00 PM   #6
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Default Re: Obd0 DPFI to OBD1 MPFI conversion.

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no do the wiring for mpfi then get a obd0 to obd1 ecu jumper harness and maybe the dizzy jumper plug to use the dizzy fron the z6 if you wanna use the obd1 injectors when you add the wire for the resisor box wire them all together to eliminate the resistor box
Oohh. OK, OK. You said MAYBE get the obd0 to obd1 dizzy harness? can Anyone confirm if I will need this? And can you be more specific about the "wire them all together" part of the resistor box Elimination? Thanks.
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Old 01-25-2012, 04:35 PM   #7
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Default Re: Obd0 DPFI to OBD1 MPFI conversion.

Wiring them together is only done of you will only be using saturated (obd1) injectors. I prefer to use the junction box, like oem.
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Old 01-25-2012, 05:29 PM   #8
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Default Re: Obd0 DPFI to OBD1 MPFI conversion.

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Wiring them together is only done of you will only be using saturated (obd1) injectors. I prefer to use the junction box, like oem.
Well since I already have the high impedance obd1 injectors, I want to use those. With no resistor box, of course. I was just asking him to elaborate on How to "wire them together"
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Old 01-25-2012, 06:21 PM   #9
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Default Re: Obd0 DPFI to OBD1 MPFI conversion.

Take the yellow black wire coming from the driver shock tower plug, and take the red/black wires from the injectors. And solder them together
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Old 01-25-2012, 07:07 PM   #10
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Default Re: Obd0 DPFI to OBD1 MPFI conversion.

^correct

if your gonna use the z6 dizzy then you'll need the obdo to obd1 dizzy harness adapter or just wire in the obd1 dizzy plugs
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Old 01-25-2012, 07:25 PM   #11
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Default Re: Obd0 DPFI to OBD1 MPFI conversion.

monotech hooked me up with everything i needed for this conversion
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Old 01-25-2012, 07:33 PM   #12
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Default Re: Obd0 DPFI to OBD1 MPFI conversion.

If you need a conversion harness I can build you one. I use brand new wiring and new oem pins. check my sig below or message me if your interested. No cut n splice, or used 20yr old wiring here.

DPFI to OBD1 vtec conversion harness

http://www.youtube.com/watch?v=puPiw...e_gdata_player
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Old 01-26-2012, 02:50 AM   #13
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Default Re: Obd0 DPFI to OBD1 MPFI conversion.

OK guys thanks so much for all of your help. I've Got one more quick question, though. Which color wires from the dx harness do I wire to the obd1 dizzy plug? Or do the wires go in to the back of the obd1 plug the same way as they go into the back of the obd0 plug?
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Old 01-26-2012, 04:50 AM   #14
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Default Re: Obd0 DPFI to OBD1 MPFI conversion.

Colors will be mostly the same, with age they would fade n change
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Old 01-26-2012, 09:21 AM   #15
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Default Re: Obd0 DPFI to OBD1 MPFI conversion.

How much does one of your harness cost?
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Old 01-26-2012, 12:46 PM   #16
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Default Re: Obd0 DPFI to OBD1 MPFI conversion.

Quote:
Originally Posted by 91 EF DX View Post
How much does one of your harness cost?
Pm or txt me
916-541-5266
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Old 04-17-2015, 11:22 AM   #17
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Default Re: Obd0 DPFI to OBD1 MPFI conversion.

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Originally Posted by crx_si-r View Post
Take the yellow black wire coming from the driver shock tower plug, and take the red/black wires from the injectors. And solder them together
I also prefer the OEM look using a junction box...but my question is.....on my 1991 DX Sedan DPFI...I dont' see a resistor box anywhere...now I could be overlooking it...but my question is...

I'm currently converting to MPFI and want to use the junction box for the black and yellow wires for my odbd1 injectors plugs. Now I know the junction box needs to receive a 12v signal that is passed to all the wires in the junction box...where could I tie into a 12v signal for the junction box?

I'm using my dx harness to work with a d16z6 swap with mpdfi obd1 conversion.

Not trying to hijack this post but this has the most relevant information pertaining to this topic. Appreciate any guidance.
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Old 04-18-2015, 03:03 AM   #18
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Default Re: Obd0 DPFI to OBD1 MPFI conversion.

The DPFI engines don't use a resistor box only the MPFI OBD0 from the EX/SI/HF models.

DX,STD (DPFI) -> Si,HX (MPFI) wiring
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