DPFI to MPFI Complete Wiring Guide - 88-91 Civic & CRX 

You speak and work as if you've done this a thousand times, I love how clear and accurate you work, thank you kindly from one Honda guy to another! I would so like to ask if you can confirm if an obd1 (92, 93) IACV will plugNplay on my "obd0" (90, 91) DA9 Integra? They're both two wire, thanks again!

Is anyone else impressed by what Tom Cruis knows about old hondas!?

Rewatching your videos recently makes me miss my CRX 😢

You are literally a Honda God for uploading this. everybody talks about how easy it is but nobody ever shows it in depth.

Great job cleaning up that manifold. It'll be interesting to see the difference in power when you dyno the new multipoint setup. Thanks for sharing. I don't own a Honda yet but I'm really fascinated by older Hondas.

Love your videos buddy.especially the crx videos.saved my butt a bunch of times.im getting another crx tomorrow so your video count is gonna go up I bit lol.your wiring videos are in-depth and very helpful.keep up the good work.

Jon, your service to the EF community is outstanding! I am so glad I subscribed. This takes a lot of the mystery out of what lives behind my engine. I already have an Si, (Tahitian Green: the most 1991iest colour! Yay!) so everything was done at the factory, but now I know what to do, if ever I have to take put the IM. This video is EXCELLENT, but if you will permit me one expression of selfishness, I would like to know what are the components, for which you replaced the vacuum hoses? I am super-noob, and it's hard trying to figure this stuff out on my own.

Found your channel by random love it already quality stuff great content makes me wunna build up my da9

Best wiring mpfi how-to 👍👍

Commented before I’ve been watching a lot as I’m getting ready to swap my b20b from hmo into my dpfi hatch are you currently selling any merch etc so I can support your channel , you honestly have the most clear content I’ve seen on these cars. TIA

i don't have a honda but appreciate the work you do, cheers

Nice, been waiting for this cuhz 👍🏽

Subscribed! Thanks man one day I plan to swap from my Dpfi. Gotta gather all the necessary parts 1st

oh yea can't wait to check out this now. your instructional videos are always top of the line being informative, thank in advance!

Great video and attention to detail, you're going to help a lot of people with this video series. Need to make it into a playlist so it's easily shareable.

So thankful for this series of intake swap videos, I've got the dual point manifold and wanna swap to a new one and everyone has told me it's just plug and play I dont have to do anything other then take mine off and put the other one on and run it, you're going in depth on what I truly need to do, this saved me HOURS of knuckle dragging mind numbing nonsense lol, I want to swap a Y8 intake manifold onto my d15b2 I read somewhere on an old form from 04-08 said it was possible and they've done it but no proof, I might sell that intake and buy a pgm intake. Thank you for this video though!

I had to do this years ago when I was 18 with a dohc zc motor. My very first swap and I wish I had videos like this back in 2005. Lol

Dude, the quality and detail here is amazing!! Great work brother, thanks a ton!

I love your content!! I have learned so much watching your videos. I have followed the steps in the guide as far as I can. I have a couple of doubts, to see if you can give me a hand. -The conversion of the injectors, all perfect. -The wiring of the 4-wire lambda probe, everything perfect. -Prolong both TPS and IACV, all perfect. My doubt comes when removing the pins from the old connector, to make them coincide with those of the new distributor, D16z6, I understand that 5 coincide, right? The other two are the new ones that need to be wired to the ecu? Are they C1 and C2? Thank you very much!!

congratulations for the video !!! really beautiful! I did the same job on a Civic eg4 (d15b2). after mounting the P06 control unit and everything needed for the swap, I found only one problem: with the engine cold the machine does not keep the minimum! I can't understand why! hot everything goes smoothly but cold, for the first 2 minutes the minimum is really low! I repeat, only from cold though! would you have any advice to give me? thank you! 😁

yo this video is the shit bro u going to help me alot most ppl were i live want me to paid 1000 to 1500 for this so thank u so much and god bless this man for makeing this video so i can do it my self keep it up and once again thank u

greatest video EVER!!!!!!!!!!!!!!!!!!!!!!!! i am doing this next weekend so Awesome

I'll said it again, super cool videos @Jon Widmer, I have a question, if I want to use a 92-95 intake manifold with injectors and fuel rail of that year, all the connections are the same? The TPS, IAC, IAT etc, I didn't know that for the d16a6 intake are the same connectors, and do I need to use the resistor box even with the 92-95 injectors?

Sick videos man ! Really excited to do this! Just picked up a 90 EF Dx Hatch to mess with on the side and this is a perfect first mod. 2 Question for yah. 1 What gauge wire are you using to make the harness. 2 What more would i need to do to use a obd1 ecu instead of a obd0 ecu, my long term goal is to do a mini me swap with low comp rods and pistons and just do a cheap ebay turbo kit and have some fun and my understanding is obd1 is much easier to tune

Great write up / how to man! I am pulling the trigger on this, have everything torn apart and am prepping. The only question I had, was at @12:20 I saw that you had the connector to the resistor box, but when the screen changed all the wires were hooked up from the fuel injectors. Does it matter in what order they are wired up? Thank you, and great write up, I will be using a socketed PR4

So if I'm doing this conversion and the obd0 to obd1 swap at the same time, I can just run the 4 yellow/black wires from the injectors directly to the wire coming from the a15 pin on the ecu to bypass the resistor box. Is that correct?

Yo i love young static but your how too made my job so much easier!! God bless

If I have od1 injectors, Do I just ground the wire for the resistor box since I won’t use the resistor box?

If going from a dpfi to mpfi and obd0 to obd1 at the same time, can I just group the resistor wires from the injectors together like in your obd0 to obd1 video? Thanks for these videos, great work!

Watched this video and its super helpful thanks for doing it super detailed and helping us out in completing these swaps!! 👍just had a question does it matter if i use obd1 injectors??

Great work man! Is it also possible to make dual carb to mpfi? If so what parts do I need? I want to change the dual carb of a 1.4 ef hatch’s dual carbs to mpfi. That would be very interesting if do a video!:)

I’m building my d15 hatch and want to do this, bc I’m using stock engine for a while while my engine is being machined etc, please thanks man love the video

After doing this would I essentially be able to run a jumper harness to this and a obd1 ecu so I could tune it ?

Thank you so much for this

Very detailed!

I have a question about that swap. So I understand everything that’s going on in that video but i need some info about converting to obd1 or 2 injectors. From the DPFI. So I assume that I would do everything the same with A1-A3-A5-A7 but the A15 wire which would normally go to the resistor.? What if I don’t need a resistor for my injectors? Where would a15 go ? And also the yellow wires for each injector that would normally go to the resistor. ? I’m doing a b series with the obd1 Ecu chipped ect.. I’ll have a jumper for knock, VTEC, O2 ect... and a obd0 to obd1 jumper aswell for the main. ? Would I tie the yellow wires if ea Injector directly too a15? Skipping the resistor?

Thank you this was help full .

I'm really enjoying your videos. I've been bingeing them all day, LOL... Its really motivating me for my EF sedan.... I want to do a b series turbo, just don't know which B series.. I'm leaning towards non vetted b20. Or maybe a k series but I'm not sure if the OEM hood would close. Do you know if EF's with Series are able to close the hood? the K series seems like a tall engine.

Hey I have a d16a9 dohc from a crx for my twin carb GL 91 UK civic I have no loom and no ECU as of yet not many d16a9 looms about can I cop another loom? Great work on cleaning the inlet I know first hand this isn't a fun job lol

Trying to do the same swap on my 91 hatch, is there any way to get an exact parts list for purchase. Going to use this video as my DYI guide S this is excellent information and teachings for advanced and dummy mechanics... trying to swap on a budget, so might be buying some parts used or donated if possible...

New subscriber here been doing this since the early 2000’s and Iv always use the stock dpfi injector wiring . Is it easier to to make the entire injector harness from scratch ?

Awesome video.

great video bro super detailed awesome work 👍

Hey bro I did the way u show at the video but my injectors not getting power any solution?

Hey Jon avid Subscriber Here to your EF videos. You simply have a gift for making these D.I.Y videos... You almost never cut out any steps in videos and have the ability to keep me hanging on every word along the way. I recently got myself another EF hatch in 89 DX to be exact. And also just like you I am in the preparation stages of dropping in a B20 into it. this isn't my first go about when I was 21 about 10 years ago had a 91 DX hatch with the B18 A1 swap in it but unfortunately the guy who did most of the swap didn't really give me directions thoroughly throughout the swap mostly let me defend for myself once the swap is done but ended up pulling it and installing it two or three times but now getting ready to do the full thing myself from the dual point setup I am finding out about the whole multi point conversion needed to be done. I was wondering if you could answer me the quick question and let me know if I'm headed in the right direction but I have a B20 with a LS intake on it and all OBD1 components that came from a 92 OBD1 da Integra. So I got the pr4 ECU I believe was the number might have to double-check with the same dizzy that came on the car and injectors as well as the the original engine harness and a OBD2 harness on the side if any wires are needed. My question is is this setup you got for all the sensors and vacuum lines roughly the same to an extent for the p75 intake manifold from the DC Integra? Would following your instructions Point me in a direction to get to where I can get plugged in with what I have? I know I will pry still need the ECU jumper to run the ECU through the car harness into the engine harness correct? And Leslie is running a pr4 ECU on a OBD1 p75 intake manifold going to cause me any issues or do you think it's a better route to go with the intake off the 92 LS instead? I'm sorry comment was as long as it was but I've watched hours upon hours and given that you have a B20 in your EF hatch which I believe is also in 89 I was just hoping you could point me in the best Direction. I'm in Colorado so emissions are fairly lenient here. By the way I'm literally mid way through the rear disc conversion from the da on to the EF from your video but have just been played by doubt from this mpfi conversion and really not wanting to have to drop three to four hundred dollars on a conversion harness at this point. And I believe you're the man that can shine light into the darkness LOL thanks man hope you can take a minute to lend some words to an eager ear with steady hands ready to follow.

Hi there, I am from Philippines, I do have a honda civic ek lxi 99 model. its a carburetor type, I swapped the carburetor intake to p08 intake manifold. all sockets were into places, but then when I tried to start it, there was no priming. no sound from the main relay. I might be missing something, I font know if its the main relay, fuel pump or if theres abything from the wiring that I should do.

I'm seriously considering buying a rust-less White 1988 GL civic 1.5 ltr within the next week. Just have to go and take a look at it and take it for a drive. Damn, I haven't been this excited about a car purchase, for about 12 years ahaha. I'm just wondering what would be the cost now in parts to do the conversion? in USD is fine, I'll just convert it to AUD :) the last question is, what did it do to the mileage per tank at normal driving vs "spirited" driving? did it become a lot more thirsty? Thank you in advance and thank you for the informative clip. If I buy the car, once the work is done, I'll post some links to some pictures of it with the work completed if you like.

Great video. i like your explanations and your attention to detail. Making it look oem.👍

HI , I teach a high school automotive class and we are currently doing a honda swap. Great video and it has really helped the students along. We are close but only have 2 injectors working ( Cylinders 1 AND 2) We are installing a1990 Integra B18 MPFI into a 1990 Honda Civic DPFI. My questions is does the ECU have to be a PM 4 ? Right now we are working with the Civic's stock ECU which is a PM 5. We also have the integra's ECU which is PR4. Do we need to locate a Civic PM4 to fire all the injectors in the B18 ? Thanks

I'm about to b swap an old 1990 hatch, this info is coming in handy! Any tips or tricks on the swap itself?

12:45 Those are the GROUND wires. The injectors get constant 12 V with the yellow/black wires and the ECU grounds the injectors to get them to open.

@4:22 I have that’s same valve on my MPFI. Would leaving them alone be alright? Or would I have to get them covered and plugged?

Hey just wondering can’t I jus use the whole engine and engine harness if I have a ex or si mpfi motor and only rewire the injectors

Hope you see this lol. But for the common yellow/black running to the resistor box. Does it matter which injector goes to which wire?

could you list specs of coolant and vacuum hoses, I would like to pick some up today for mine

I must have missed where to wire up the two extra wires for the distributor plug. Which pins do they go into on the ECU?

I got a question i live in the uk and have a carb d14a1 engine any idea on how i can convert it to mpfi? Or is there any videos out there? Thanks!

Hi, I have b16a2 engine, i am going to use my old d16a7 engine harness with obd1 p30 ecu, is this tutorial going to work with it?

hey man love your videos... Iam getting ready to do this myself I was told I needed an so dizzy.. am I able to use my old one... if possible can you send me a parts list... also where did u get the connector that went through the firewall (little white pug male and female) what gauge wire recommend

The green connector with the 4 red wires where did you get this from? Was this the green clip you cut off that you said you werent going to cut off before you cleaned up the engine harness

I have a really good question I did this mpfi swap.. how do I get rid of the eld code 20 that's putting my Charging in limp mode? Dx 90 hatchback don't have eld...my 89 pm6 ecu does!! It's my daily help! Lol

Please help me I have a 1990 honda civic dx that had a d15b2 I am swapping a z6 into the car I have followed your instructions completely on the dpfi to mpfi then added a jumper harness and I'm not getting spark and I can't figure out why.

So does this mean I have to change the ECU since the old ECU was meant to work with the dual carbs and now they are gone how will react with MPFI

where do the 4 wires that you removed from the original connector and capped off go?

Do you need to do any of this, if you’re going to convert to obd1? I have a d16z6 and going to put in crx. Do I skip this and just buy the conversion harnesses?

Where did all the plugs originally go before changing manifold

Would this method also work for a b18a1 swap? Great video by the way, explanation was very easy to understand.

I’m planing on building mines soon I have a rebuild head and block all machine work done to it. My question is can I use my old a6 harness to do the conversion? The car is originally dpfi and want mpfi since I have extras laying around

such a good video!

My 89 sedan, it doesn’t have a resistor box would I just run those to ground ?

So i have to do this for a obd1 b18c? It has obd1 p72 ecu. I have obd0 dpfi d15b2 eg4. And the rest by your obd0 to obd1 video?

Hi Jon, is there any benefit to using a CRX SI head (I have one with its cam and intake manifold for my conversion)? Or Is the D15b1 head the exact same thing and the difference in power with the SI Is the mpfi intake manifold and camshaft? (of course the slight bump in displacement as well).

What should i do with the injector wires that I depin from the clip to the ecu should I cut them and tape them shrink etc. And totally delete them

What if I use the intake manifold from a eg civic well the rest be the same ? Same dizzy and ecu.

I'm not very mechanically inclined but I figured it wouldn't hurt to ask. When extended the wires such as the TPS what kind of wire is used?

at 4:08 you say you dont need that wire now what is that usually used for?

did you use the original dpfi harness for this? in doing a dpfi to mpfi conversion on my 91 hatch for a mini me swap and im lost when it comes to the wire harness.

Terrific video. Quick question. In your video you were replacing what you called "vacuum" lines but were swapping a hose to the fuel pressure regulator. Are vacuum hoses safe for carrying fuel? My current knowledge is that you use either a fuel, heater, or vacuum hose depending on the application. I thought vacuum was only for lines with just air and no fluid. Thank you for your time and help!

John if you read this..any chance you have the distributor plugs needed for the mpfi swap? I can't find them. Thanks.

How would this go as far as the process to go from dual point to multi for my b20b it’s my first swap and the wiring is wigging me out sorry if it’s a stupid question TIA

I have 1988 civic dx hatch with automatic trans what ecu I need to be able to do conversion?( ps9 ecu from 90 civic ex automatic)is ok ?I wouldn't have problems?

I have a 1991 civic dx hatchback with D15b2 none vtec i have a d16z6 head do you have videos about head swap? If not can I use the intake manifold from the z6 for the b2 dual point to multi point?

Wow how you know all that I do have a crx ef and when get hot start idling and when I turn on the ac goes a way any ideas please thanks

Great Video ! Very helpful !!

I have a 1989 manual 4 door EF. Taking the DPFI and putting in D16z6 from a Civic Del Sol 1995. The donor car is AUTOMATIC. Im planing on installing the new engine with its original harness from the Del Sol and the P28 ECU converting it to MANUAL taking the 2 resistors off. But is there anything i need to do the harness to have the car running?

I have a request, for a ls vtec video that feature using ls parts that are common to Frankenstein ls integra intake manifold to em1 b16 cylinder head

So if I have the whole si harness, si injector box and ecu, will I still need to do this?

How do i know if i have to add a resistor box, how can i tell if the injectors in the manifold i have arr obd0 or obd1?

So im doing a mini me swap i got a y8 head and im trying to get a z6 manifold can i use this method for that

great vid john waiting for next sat.. im having a issue with my 89 d15.. keeps stalling when i try to start it.. between 5-15 stalls before it runs fine.. only thing I have done is alternator/starter/batt/fuel filter since I bought it. any ideas? im thinking fuel pump but im not sure..

I need to obtain the resistor box which one should I get? 1988 civic dx hatch with dohc zc

Hi bro, i'm a little confused: I have seen many videos/tutorials/guides about the DPFI conversion to MPFI. Some of them says that the order of wiring the injectors are: Dizzy...#4--#3--#2--#1 Timing belt. Anothers says totally the opposite: Dizzy...#1--#2--#3--#4 Timing belt. What is the real order? What could happen if the order is wrong? Thank you!!

Great fucking video! very detailed just good shit man! keep up the great work because it's fucking appreciated! THIS DUDE HONDA GAME ON POINT! RESPECT!☝

can you put an obd0 ecu with obd1 injectors without resistance box?

Thought the yellows wires from the injectors went to a15 on ecu

Ok are you still uesing the obd0 or obd1? And can I do the same method for a D16 Z6 going from a non VTEC to a VTEC

Hey I have a question. I’m almost done with the wiring. My question is. Which manifold do I need? And also I need a different distributor right?. I have 1990 Honda cicic 1.5.

So how much horsepower gains are there between MPFI and DPFI? Edit: NVM I saw the dyno lol.

i have question on wire harness. i have 96 ek cx im putting b18b1 . what do i have to change or extend

U mind telling me how to do this on a stock obd0 b16 Sir engine got the stock harness and resistor box but need to do the injectors I have a DA integra injector pig tails but I wanna know the colors they go into please help me thx!