all the how-tos are WRONG!!!

pm5 · #1 10-30-2003, 06:08 PM

I did a multiport conversion and i used these dumb ass how-tos to do the wiring. Well my car wont start now and i think i know why. The how-tos are WRONG WRONG WRONG!!!

I was looking at my chiltons manual and i noticed that the how-tos are totally screwed up. Like this dumb shit from the SCC how-to: "...run a yellow wire from the No. 4 injector to A7 on the ECU." What?!? A7 feeds the resistor box (yel/blk wire)! Who whote this bullshit?? For the distributor wiring, its more than just moving two wires. Most of the DX and Si wiring go to TOTALLY DIFFERENT PLACES! Heres some more how-to bullshit: "Move the wire that goes to pin C1 to pin B10, and move the wire that feeds pin C2 to pin B12." Wrong again. C1 should go to B15 and C2 stays where it is, unless u have an ECU from a non-A/C car, where it should go to B2. So, heres the REAL how-to.

Injector wiring:
Run brown wire from #1 injector directly to pin A1 at ECU.
Red wire (#2) to pin A2 at ECU.
Blu wire (#3) to pin A3 at ECU.
Yel wire (#4) to pin A4 at ECU.
Pin A7 (yel/blk wire from main injector) feeds your resistor box, which powers your fuel injectors. The brown, red, blue, and yellow wires go to the ECU where they are grounded, completing the circuit.

Distributor wiring:
Move pin C1 (org) to pin B15.
Move pin C2 (org/blu) to B2, unless u have A/C.
Move pin C9 (wht) to pin B16.
Blu/Grn from cyl sensor goes to pin C1.
Blu/Yel from cyl sensor goes to pin C9.

The rest of the how-tos are basically correct. I still dont get how u all got ur multipoint conversions done. Unless the chiltons manual is wrong.

90civicrider · #2 10-30-2003, 08:35 PM

I'm pretty sure a few people on here have used that How-To with no problems.
Maybe 1 of them will view this post and reply...

crxlvr · #3 10-30-2003, 09:10 PM

i have noticed the chiltons manual to be wrong at times, but plenty of peeps here have done the mpfi swap before, maybe you just crossed something so thats why your car aint starting now.

GTA · #4 10-30-2003, 09:11 PM

i dont usually trust a chiltons for wiring, only a helms, but i've known a few people that used the mpfi guides and they worked fine, like fourthgenhatch did and he made his own writeup for it.

btw, are you sure your looking on the ecu plugs right? like how the numbering goes

1357
2468 etc.

pm5 · #5 10-30-2003, 10:23 PM

Yeah i know how the numbering for the ECU pins goes..what started to make me suspect that the how-tos were wrong was when i looked to where the old wire that went to C2 went to its new location... it went to some A/C thingy. Then i started comparing the DX vs the Si wiring diagrams and most of the distributor wiring was different. It kinda makes sense now why my car wont start. I wonder what HASport has to say about this.

MaXXuS · #6 10-30-2003, 10:26 PM

I used 6 different "How-To's" and had no problems accept when it came to my cyl. wires. My advice to you would be to wire Brown, Yellow, and Red wires to the ecu and blue to the shock tower. I only say this because it is the only way I got my car to run perfect. And also I would soldier every single connection, especially those going to the ecu. If you have a diagram pinout of the ecu use it, and make sure you are not reading them backwards. I knew a guy who did this and it only caused him more confusion.

Miataracer · #7 10-30-2003, 10:41 PM

chiltons is far from perfect... they didn't even get the firing order right on the Miata book...

pm5 · #8 10-30-2003, 10:42 PM

Yeah i think i heard something about three wires going directly to the ECU. I am still worried about the distributor wiring because theres alot of wires that are different. Also, i cant shift out of park anymore without putting the key in the shifter release.

pm5 · #9 10-30-2003, 10:48 PM

Does anyone have the Helms manual? Someone should check into this...i seriously dont trust the how-tos anymore.

ZC4ME · #10 10-30-2003, 11:05 PM

The only thing that I questioned was the "How To" on fourthgenhatch.com saying that the view of the wire would be from "the harness side with the wires coming out of it" To me, what I experienced was the exact opposite of that. To me it shoud read "the side you are looking at is the ECU side, with the wires coming out of the back" other than that, I had no real problems.

I will say that when I did my wiring, I actually opened up the factory harness and removed the primary and secondary injector wiring and replace them with factory injector wiring that I pulled from an Si harness. I also ran factory wires for the other two injectors to a plug that I mounted on the driver side shock tower. I also ran my cylinder position sensor wires to that same spot, they actually run through the plastic thing that goes along the fuel rail to get to that point. I then ran four wires from that plug to the ECU and connected everything at the ECU the way that the "how to's" stated. I only ran shielded wire from the CPS to the plug on the shock tower and ran Rockford Fosgate speaker wire from that point to the ECU.

I am kind of curious about the whole A/C wire that it suppossedly removes, does anybody have a Helm's ECU pinout that they can post up, I have been wanting a good diagram of the whole electrical system because I have a Haynes manual.

peace
Griff

gsf1200m · #11 10-30-2003, 11:11 PM

I also looked at like 6 different how-tos that all said the same thing. I did what they said and my car started right up and still runs perfect. I have a/c in my car and I just tried it and it works with no problems.

pm5 · #12 10-30-2003, 11:20 PM

One of the how-tos says to move pin C2 to pin B12 unless u have A/C...then where does it go? And then the shifter part...why doesnt it shift out of park anymore? Gonna pick up the Helms manual at the library tommorow...im gonna check all the wires that are affected by a MPFI swap and pretty much re-do all my wiring. Ill let u guys know what happens.

ZC4ME · #13 10-30-2003, 11:31 PM

Quote:

Originally Posted by pm5

One of the how-tos says to move pin C2 to pin B12 unless u have A/C...then where does it go? And then the shifter part...why doesnt it shift out of park anymore? Gonna pick up the Helms manual at the library tommorow...im gonna check all the wires that are affected by a MPFI swap and pretty much re-do all my wiring. Ill let u guys know what happens.

I have never read a how to that stated not to use B12 on A/C equipped cars. I have only read that most cars are empty and pins B10 and B12, although some models have a wire at B12. Man, I hope you can get this all figured out, I know it has to be really frustrating.

peace
Griff

gsf1200m · #14 10-30-2003, 11:39 PM

Are you sure you are using the correct ecu?

4GZChatch · #15 10-31-2003, 12:17 AM

Dood, I could do that swap in my sleep, and I can say that wires A1,3,5,7 definitely go to the injectors, and that the wire that goes to the resistor box comes directly out of the main connector at the strut tower. I will post a pic of which wire to use, if you want. The wires at C10 and 12 go to the white and orange wires that get cut off B1 and 2. The wires left at B1 and 2 get lengthened out and run directly up to the dizzy for the TDC and Cylinder position sensor. That's really all there is to it. You have to lengthen some of the connectors on some harnesses, but it's generally not that bad... You do have to take into account that the wiring on the Si and Dx are not the same on the diagrams, and you have to use the Si diagrams uniquely, since you are converting to the Si/ZC ECU configuration... If you have any questions, email me directly at [email protected] Good luck!

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