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so im collecting parts for the EFI conversion, and i was goin thru my wiring harness today and I know that i need to hack up the harness a little.... but which ones do i cut off? ive been gogling this for days and i thought i would be able to figure out by just looking at the harness, but im worried about cutting something off i need,

 

 

does anyone know what plugs i need? i know injectors, AFM, TPS, cold start, ECU, but is there more?

 

all help is appreciated in advance!!

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What "harness" do you have?  IF you are talking about the stock wiring harness from your carbureted 2002, you don't really need to "hack up" anything.  The car needs to supply power (+ & -) to the EFI system and you will have a wire coming from the ECU to give the Tach a signal,  everything else is unique to the new system.  IF you are using the distributor you will need to connect to it (and also hook to the coil) 

 

What EFI system are you using?  The EFI system needs a completely separate wiring harness that connects to all of the injectors, AFM, temp sensors, engine position sensors, ECU, ignition (single coil with distributor or multiple coils direct to plugs), fuel pump, tachometer and the ignition switch to supply it with power.   

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^^^ i have all 130 pages printed out... its kind of overwhelming go to through....

 

was hopefully looking for something simpler. 

 

like all i should need to leave on the harness should be, ECU, injectors, AFM, coldstart. TPS, and the 3 relays.

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e30 m10 dont have a CPS i thought... plus from my research it says i can use the stock ignition. all the ECU is gonna be controlling is air and fuel.

 

does that not sound right?

 

yeah i need a o2 sensor. this might end up being a giant experiment....

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When I did my 318i EFI conversion, I completely disassembled the harness and was able to eliminate about two-thirds of it.  I made a drawing of what remained of the harness and it accompanied a nice how-to article re: this conversion written by Mike Kubani that were in the "old" FAQ how-to articles.  However, after searching for it I couldn't find it.  Either it fell by the wayside when the "new" FAQ was created or I didn't look in the right place.  Hopefully someone can point you in the right direction as both the article and drawing pretty much spelled everything out. .

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When I did my 318i EFI conversion, I completely disassembled the harness and was able to eliminate about two-thirds of it.  I made a drawing of what remained of the harness and it accompanied a nice how-to article re: this conversion written by Mike Kubani that were in the "old" FAQ how-to articles.  However, after searching for it I couldn't find it.  Either it fell by the wayside when the "new" FAQ was created or I didn't look in the right place.  Hopefully someone can point you in the right direction as both the article and drawing pretty much spelled everything out. .

Is this the article to which you refer? It's in the "Articles" section.

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i have that printed out as well, haha. i read about once to twice a day just to make sure there arent any small things i missed.

 

my biggest concern is i dont want to cut off an important ground wire and end up blowing out the wiring or the ECU and then be stuck.

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If I still had the digital file of the wiring diagram, I'd be happy to post it.  Unfortunately, this drawing was done approx. 15 years ago if my memory serves me and that file has long since disappeared.  There was a copy attached to Mike Kubani's original article but evidently went bye bye when the new FAQ was created.  Maybe Steve K. can retrieve it and re-attach it to the article.

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the best way is to do that is build your own harness and wire it in as a stand alone system if your doing a DIY autotune or megasquirt really the only circuit you want to use from the OE harness is the ignition switch from the backside of the fuse panal. 

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