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Went to the junkyard yesterday to try and find parts for a DPFI to MPFI swap. Didn't find anything except for some Honda center caps and a coolant overflow reservoir. Found out my dad's mechanic friend found a complete IM with fuel rail, injectors and plugs etc. All he needs is a dizzy and a PM6 ecu and a resistor I think. From my search here and every other forum, these are questions I'd like answered:

1. Does the complete IM (TB, fuel rail, injectors & plugs, all sensors, hoses), ECU, resistor box and distributor have to be from an 89-91 si or can I use parts from any D-series engine that is MPFI such as a D16A6?

2. I don't believe I need a complete engine harness right as I can just extend wires and such from my DX harness right?

3. If I understand correctly, OBD0 is for cars 91 and older, OBD1 for 92-95, etc. If everything I find is from an 89-91 civic/crx, do I need to convert to OBD1? I don't think so right? This is so confusing!!!

4. Anything else I need?

5. Anyone in the Northeast PA or Northern NJ area want to sell me stuff cheap, send me PM.

Thanks in advance for all your help!!

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[xxpaulcpxx]

1. You can get your parts from any D16a6, which can be found in the 88-91 CRX Si, Civic EX, or Civic Wagon with AWD. Some electrical parts can also come from the 88-91 CRX Hf. Since the Distributer is the heart of the engine, you might want to consider buying a new one instead of using an old one that might have problems. Make sure you also get the rubber boot from the airbox to the Throttle Body.

2. You can use your DX harness, but you will need an MPFI harness too so you can add in all the wires and connections that are missing on the DPFI harness. You will take connectora off the MPFI harness and put them onto the DPFI harness. You can also get premade harnesses.

3. No, you do not need to convert to ODB1 or 2. You might do this if you swapped in a newer D series engine, but this is not needed for the basic MPFI swap.

4. You will need extra bits if you have an Auto tranny. You should also get the Factory Service Manual from http://www.HelmInc.com

 

[dohcrxl]

And for the actual conversion...

1- cut c1 and move to b10

2- cut c2 and move to b12

3- run 2 new wires from the distributor area to the ecu.

a) One will go from the blue/green wire of the new dizzy to c1.

b) The other will go from the blue/yellow wire of the new dizzy to c2.

4- cut the 2 outer wires of the tps sensor and swap their positions

5- mount the resistor box to the driver's side strut tower, they'll be an obvious place

6- run and extend the 4 wires that are the same color from the resitor box to the injector area. Each injector will receive one of these wires

7- run a wire from the no 2 injector to a3 of the ecu, run a wire from the no 4 injector to a7 of the ecu

8- cut the existing wires that went to the 2 injectors on your dual point system

a) the yellow wire that used to go to the auxillary injector has to be extended and run to the no 1 injector

b) the red wire that used to go to the main injector has to be extended and run to the no 3 injector

Uhhhhh... after typing all that out from memory it occured to me that it'd be smarter if I just post a link for you. DOH!!! oh it even has pictures.

click here

 

[Stavros]

make sure you solder the connections, and use heat shrink.... or if you cant solder, use heat shrink butt connectors.

electrical tape/marettes dont cut it. you dont want to hit a big puddle and stall your car.

i spent a good 5 hours doing this swap in my old rex, and that was to ensure all the wires were where they should be. take your time, it will save you the headache of finding out where you screwed up or paying someone else to.

good luck man!

 

[progress]

Thanks for all the info guys. I didn't find anything at the junkyard except for around four first gens in varying conditions of pillaging. I did end up with 8 Honda center caps and a coolant overflow container.

My dad's coworker has a hook up on a potentially complete IM but he doesn't know what engine it's coming from and whether or not he has a dizzy, injector box and an PM6 ecu. I'm guessing I will have to buy this upgrade piece by piece so it looks like I'm staying DPFI for a bit longer. Thanks again.