PDA

View Full Version : Complete OBD 1 Conversion Harnesses



LX-incredible
04-20-2009, 10:19 PM
Finally, a complete obd1 wiring solution for our accords! Thanks to the persistence of several of the members on here, some really neat stuff is becoming available. What better to top it off with?

All connections are crimped, soldered and sealed at the connector for ultimate reliability. New automotive wire is used in all runs, beautifully loomed and taped. Designed to be fully plug and play and easily removable.

You will also need a obd1 ECU, distributor and adaptor plate.

86-89 Accord obd0 - obd1 ECU jumper $100
Includes connector for extension harness. With vtec connector add $7.

ECU extension harness $70
Connects to ecu jumper to run extra wires to the engine bay. Includes vtec.

A20A3 obd1 add on engine harness $120
Plugs into ecu extension harness. Connects to additional sensors, obd0 distributor plug, and stock coil to allow you to run obd1. Includes ELD and mounting bracket. O2 front placement.

86-89 Accord obd0 - obd1 distributor wiring adaptor $65
Perfect for those inclined to run all the extra wiring themselves. Includes weatherproof crimps and wiring to the stock coil.

http://img293.imageshack.us/img293/5599/ecujumper.jpg

http://img404.imageshack.us/img404/7775/extharness.jpg

http://img178.imageshack.us/img178/5506/engharness.jpg

I will also entertain the idea of modifying your stock engine harness to your specs for obd1 and/or B series motors. ECU jumper and extension harness will remain the same as the A20 for these. PM me with details for a price.

This thread was started here and not in the for sale section to answer any questions and to allow for input. Actual transactions will be handled with private messages.

MessyHonda
04-21-2009, 12:15 AM
did you use shielded wire?

LX-incredible
04-21-2009, 11:08 AM
did you use shielded wire?

Yes, shielded wire was used for the o2 and crank position sensor wires.

stat1K
04-21-2009, 11:23 AM
i see how it is :(

good job on the collage that's pretty much what i was thinking...

and as for the quality of this product it is A+ top notch... all new wires on the sub harnesses with perfect seals on every plug. definitely the easiest solution to the wiring problem!

ghettogeddy
04-21-2009, 11:42 AM
man thats tits to bad i traded back my mounts to tommy so he would have to spend the extra cash on me lol

Tdurr
04-21-2009, 12:03 PM
so if i just wanted to go obd1 with the a20, all i would need for the ecu is this "86-89 Accord obd0 - obd1 ECU jumper $100" and none of the other stuff? or would i still need to run wires for the o2 sensor?

Rendon LX-i
04-21-2009, 12:11 PM
Im going to have to get a couple things

86-89 Accord obd0 - obd1 ECU jumper $100
Includes connector for extension harness.

A20A3 obd1 add on engine harness $120
Plugs into ecu extension harness. Connects to additional sensors, obd0 distributor plug, and stock coil to allow you to run obd1. Includes ELD and mounting bracket. O2 front placement.

thegreatdane
04-21-2009, 12:25 PM
Awesome work!!

^^you would need all those parts unless you want to make some of the wires yourself. You usually wont need every single wire unless you swap in a vtec engine with stock ecu.

stat1K
04-21-2009, 01:22 PM
so if i just wanted to go obd1 with the a20, all i would need for the ecu is this "86-89 Accord obd0 - obd1 ECU jumper $100" and none of the other stuff? or would i still need to run wires for the o2 sensor?

you would need all of the pieces here for the closest plug-n-play application you're going to get... otherwise you need to do a lot more than just an o2 sensor...

couple this with the plate and you have a full setup and it's as simple as bolting and plugging.

stat1K
04-21-2009, 01:24 PM
sorry tdurr you would need the jumper and this:

A20A3 obd1 add on engine harness $120

Tdurr
04-21-2009, 01:25 PM
you would need all of the pieces here for the closest plug-n-play application you're going to get... otherwise you need to do a lot more than just an o2 sensor...

couple this with the plate and you have a full setup and it's as simple as bolting and plugging.

i was just talking about the stuff in this thread. I know about the dizzy and all that jazz.
but it looks like anyone who wanted a simple plug and play would just need to get the two things rendon has qouted.

LX-incredible
04-21-2009, 01:49 PM
For plug and play you will need the ecu jumper, extension harness, and engine harness.

The distributor adaptor and ecu jumper can be purchased separately, if you want to run your own wires.

I will stand behind all my work 100%.

Strugglebucket
04-21-2009, 04:01 PM
Pretty slick.

So the engine harness your'e making is sort of supplementing the existing harness, rather than replacing it?

stat1K
04-21-2009, 04:34 PM
Pretty slick.

So the engine harness your'e making is sort of supplementing the existing harness, rather than replacing it?

this is correct.

87roach
04-21-2009, 04:57 PM
Hmm this is fantastic! I don't recall you saying it was going to be this expensive though. Well as soon as I get enough money for this I will PM you.

Tdurr
04-21-2009, 06:07 PM
^^ the labor involved in doing wiring is very time consuming. i kno. price isnt too bad. how long does it take to make each one?

LX-incredible
04-21-2009, 08:04 PM
4-5 hrs for the engine harness, 3-4 hrs for the ECU jumper, and another 2-3 for the extension harness. Then there's the gathering, depining and cleaning of the stock connectors... I have $60-$70 in wire alone for each complete setup, about 3 rolls of $3.80 Super33 tape, loom, heat shrinks, and solder... I've said $290 for the complete setup from the very beginning, I can't justify doing it for less.

Rendon LX-i
04-21-2009, 08:08 PM
so whats the extension do... i really need is to run dizzy correct? well either way ill have to get those. I see that the extension is for vtak..but im not or ever going to have Vtak lol

LX-incredible
04-21-2009, 08:24 PM
Runs the extra wires from under the seat to the strut tower. The add on engine harness connects to the extension harness there, like the stock engine harness connectors.

I can combine the engine and extension into one continuous run, and knock off like $10-$15, but it'll be a week or so for me to build it.

No, you will get a CEL for the O2 without the extra 3 wires, and for the ELD if running anything other than a PR4.

The 2 extra vtec wires could be used for something else... That's why I didn't make them optional for the extension harness. If I am building you a custom harness they can be left out and I can knock off another $5-10. Fan wire is not absolutely necessary, but allows the option of running an integra performance radiator or other rads without a fan switch, another $5... Basically let me know what you want. If you want just a harness with the distributor and O2 wires, I can do.

Personally, I like to keep all my options open, and this is why I made these deluxe. If people want a scaled down version, I'll build it for a reduced price. I'm not going to go below $200 for the complete setup though.

stat1K
04-22-2009, 07:49 AM
for the amount of work involved i would definitely pay this... especially since i've seen these first hand and have had a hand in the gathering process... so time consuming. i've also had experience just retaping and looming and soldering new connectors onto an engine harness and i really wouldn't mind paying extra money to have it done for me.

Rendon LX-i
04-22-2009, 07:52 AM
Ill pay what you want for indeed. all the work put into this thats cheap

87roach
04-22-2009, 10:49 AM
I stand corrected, the work is top notch. I can't wait to swap this stuff in!

Tdurr
04-23-2009, 02:25 PM
lol just to do my mini tuck i used over 100ft of wire, and it took me 2 3hour nights to get the wires run. I didnt even de-pin them lol. Just cut stripped, then resoldered.

2drSE-i
04-25-2009, 07:38 AM
What would it cost me to just get all the connectors? I would really prefer to do it myself, but ive got no clue where to get the connectors. Those harnesses look amazing though!



Its not that i dont trust your work, its just that i'd like the experience of doing it myself, and if i want to super tuck the harnesses i can!

LX-incredible
04-26-2009, 02:11 AM
What would it cost me to just get all the connectors? I would really prefer to do it myself, but ive got no clue where to get the connectors. Those harnesses look amazing though!



Its not that i dont trust your work, its just that i'd like the experience of doing it myself, and if i want to super tuck the harnesses i can!

All the connectors? How do you want them, wire leads or depinned? Are you going to need them for the ecu jumper as well?

I am planing to do an engine tuck on the A20 with a B18 manifold at some point... Should look sick! Got to finish building the motor first though...

Tomisimo
04-26-2009, 05:58 AM
Will it work on B20?

2drSE-i
04-26-2009, 08:42 AM
How about wire leads?

bobafett
04-26-2009, 09:31 AM
very nice work! one thing you might consider for a slightly higher cost is using the fabric loom instead of split loom, and just heat shrinking the ends. it looks SOOO nice but would definitely cost a bit more in materials (maybe?). the harnesses already look great, so this is just a small tweak. If were paying for something like this I wouldn't mind the extra bit to have it look flawless.

anyway, great job on the harness, it looks very cool - and the price is very reasonable! I hope you can sell a ton of them :D I wish this were around when I was getting my stuff together.

thegreatdane
04-27-2009, 11:40 AM
I see that you've added a wire for the cooling fan and that you say this is for people who will be using integra civic etc. radiators where there is no option to mount our coolant switch.
As far as I know you will still need the coolant fan switch, which on the obd1 cars is located somewhere on the engine but on our cars it is unfortunately mounted in the radiator.
So this wire is not necessarily needed because you will need to somehow retain the stock fan switch anyway. And even if you decide to mount an obd1 fan switch in your block you should still be able do without this wire.
I'm not aware when the obd1 ecu actually use it's function to turn on the fan or why? Because the fan is still connected to a regular coolant switch like the one in our 3rd gens.

2drSE-i
04-27-2009, 11:55 AM
^ I always wondered about that too, seems those things are almost always mechanical. Maybe its just a check wire for the ECU to throw a code if the fan isn't working?

AccordB20A
04-27-2009, 01:01 PM
hey man good work, easier the better. but on my swap ill be using the old wires from the EGR and IACV that run to my intake manifold for the dizzys ignitor and tach signal wire instead of running extra wires :)

Tdurr
04-27-2009, 01:44 PM
^^ good ideas...

thegreatdane
04-27-2009, 02:46 PM
^ I always wondered about that too, seems those things are almost always mechanical. Maybe its just a check wire for the ECU to throw a code if the fan isn't working?

Maybe. There is no error code in the ecu that indicates a faulty coolant switch though.

2drSE-i
04-27-2009, 04:25 PM
even in OBD-1 motors?

LX-incredible
04-27-2009, 05:36 PM
hey man good work, easier the better. but on my swap ill be using the old wires from the EGR and IACV that run to my intake manifold for the dizzys ignitor and tach signal wire instead of running extra wires :)

Careful, the crank angle wires need to be shielded.

I can modify stock harnesses as well, but that requires receiving/purchasing an engine harness, tearing it apart and inspecting, running the extra wires/extending existing ones. The ECU Jumper will need a few wires swapped to make use of them, but that's no problem for me.

Yes, it will be less expensive if I am sent a harness to modify, but you will need to get another unmodified harness to return to OBD 0. I won't go below $200 for the modified engine harness and matching ECU jumper. It will be an additional $50 if your stock harness is not provided.

The fan wire is switched by the ECU which receives the signal from the TW sensor. Some OBD 1 cars do not have this feature, they use a fan switch mounted on the thermostat housing. The ecu you're using needs to be from a engine that supports this.

LX-incredible
04-27-2009, 05:39 PM
How about wire leads?

For every connector used in the harness and ecu jumper $55 shipped.

AccordB20A
04-27-2009, 07:05 PM
Careful, the crank angle wires need to be shielded.

im lucky b20 has electronic ignition so its ready there

thegreatdane
04-27-2009, 11:59 PM
The fan wire is switched by the ECU which receives the signal from the TW sensor. Some OBD 1 cars do not have this feature, they use a fan switch mounted on the thermostat housing. The ecu you're using needs to be from a engine that supports this.

I'm not aware of any obd1 engine/ecu that does.
The ones I know of are wired like this:
http://img144.imageshack.us/img144/6836/unavngivet2.jpg

thegreatdane
04-28-2009, 12:00 AM
even in OBD-1 motors?

yes.

LX-incredible
04-28-2009, 08:35 AM
Hmm, maybe I was misinformed. I will look into this further...

Edit: You are indeed correct, the ECU has nothing to do with controlling the fan.
Maybe the signal from this wire allows the ecu to up the idle to match the electrical load of the cooling fans. I'm going to connect it and see if it gets rid of the slight idle fluctuation problem I've been having during and after the fans come on... If it's useless, I'll adjust the price and remove it from future harnesses. Thanks for catching this one.

thegreatdane
04-28-2009, 01:55 PM
Alright, let us know if you find out what its purpose is :)

ChaseR
05-31-2009, 03:16 PM
Hey man I have been wanting to do this for a long time.. Can I bring my car up to tuscon? Can you help me do this? Compensation for sure.

LX-incredible
05-31-2009, 10:20 PM
Hey man I have been wanting to do this for a long time.. Can I bring my car up to tuscon? Can you help me do this? Compensation for sure.

http://www.32hours7minutes.com/wp-content/uploads/image/Adam/Night%20Vision/night%20vision%20goggles%20(4-ball%20rally).png

Yeah I could give you a hand. You'll need to pick up a plate from cygnus, ecu, distributor, and whatnot.

ChaseR
06-01-2009, 07:36 PM
http://www.32hours7minutes.com/wp-content/uploads/image/Adam/Night%20Vision/night%20vision%20goggles%20(4-ball%20rally).png

Yeah I could give you a hand. You'll need to pick up a plate from cygnus, ecu, distributor, and whatnot.

What are the NVG's for? Alright man, can I get a quick and dirty grocery list of the parts I need to get? Do you like in N out burger?

hammer3rd
10-04-2009, 05:47 AM
What about the B20A swap guys going to use carotmans wireing. Mabey you could make a plug and play harnes for this to go obd1 from the get go.

Tomisimo
10-05-2009, 04:56 AM
I'm lucky that I have B20a2, so that harness will work just fine for me as it uses the same harness and ECU as my A20a4 no EGR engine..

kk.. It sounds interesting and promising.. I'll PM you for one harness with out EGR, have no CAT on my..
What price Cygnus sels hes adapter plates and key for?

MessyHonda
01-20-2010, 02:06 AM
you still have any of these? i have missplaced my obd1 swap stuff in my 3gee parts bin..

stat1K
01-20-2010, 05:55 AM
he may but good luck getting in touch with him. i have his phone number and haven't been able to get him for a while. oh and he hates most of the people here so there's that too.

i never saw the NV goggle post, i lol'd.

Rendon LX-i
01-20-2010, 08:26 AM
yeah i havent seen him online for awhile. i need a jumper harness

stat1K
01-20-2010, 08:52 AM
i'll give him a call a bit later and see if i can get him to come on here for you guys if you're serious.

MessyHonda
01-21-2010, 12:30 AM
yeah let me know when he wants to sell

stat1K
01-21-2010, 06:32 AM
couldn't get him yesterday but i'll give him another ring today. putting it in my calendar for lunch time.

dacantu
01-21-2010, 10:21 AM
let him know I want to pick one up too please. that is if you get ahold of him

LX-incredible
01-25-2010, 10:22 PM
These are still available...

I now have a simplified version without ELD and fan wires for $240, perfect for use with a PR4 or ECU chipped to ignore ELD signal. $230 if you decide to make the connections to the coil yourself, great for aftermarket coils and ignition boxes or distributors with an internal coil. I will provide the labeled wires, you cut to length and crimp on the connectors.

I can also properly rebuild your stock harness and add the extra obd1 wires and connectors for $350-$390, depending on if you want to keep the ELD and fan wires, or have the alternator wire upgraded to 6 AWG. Sensor wires can can be relocated, extended, or deleted for little to no extra cost. For any alterations I need to be provided with the desired length and exit location on the loom. Stock lengths and locations will be used if not told otherwise. $75 will be added if I provide the harness, redeemable upon receipt of a rebuildable stock harness.

PM if you're interested and ready to purchase, or if you have an idea of what you want in a custom harness.


-Angus

stat1K
02-14-2010, 08:13 AM
obd1 bump

http://i50.tinypic.com/5akxdt.jpg

wprocomp
02-14-2010, 08:19 AM
looks good man,might get a setup myself-who has the dizzy plate adapters again?

LX-incredible
02-14-2010, 08:28 AM
cygnus x-1.

MessyHonda
02-14-2010, 10:31 AM
pméd....time to get another obd1 accord around here

LX-incredible
02-14-2010, 12:19 PM
All shielded wire now 200º C rated teflon mil-spec. All others GXL rated at 125º C or higher.

oldskool_accord
01-31-2013, 10:31 PM
I need a complete harness for a b20b vtec in my lxi call text or email me [email protected] 3236912809

rushell
10-07-2014, 12:04 PM
can u build a wire harness to install a 1993 b18 into my 1989 lxi let me know how much i will need it in a month or so call me at 706 955 8860 home or 762 215 1646 cell

clean87sedan
02-22-2015, 11:45 PM
Is any of this stuff still available!?

MessyHonda
02-27-2015, 11:46 PM
he has been gone for a while now. I bought one of his harness and it made it a breeze to install into my coupe. I think boomslang had a 88-89 obd1 harness if not i Used a CRX OBD1 convertion harness and switched out some pins.

rushell
04-08-2015, 10:02 AM
do u still sell the obd 1 conversion harness contact me at 706 955 8860 thanks

MessyHonda
04-11-2015, 09:15 AM
Like I said in my post ealier he is gone from the forum.