Let Me Show You Fox Body 02 Harness. 87-93 Ford Mustang Mass Air & Speed Density
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- Опубліковано 10 гру 2014
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This video is for folks that might be confused with the 02 harnesses discussions on the net for 87-93 ford mustang 5.0 EFI cars. This video is useful for folks with 4cyl conversions for EFI V8 swaps or folks that are changing computers or transmission swaps from AOD and T5s. Ford made 4 different pinouts for the 02 harnesses due to the differences in the NSS circuit that ran from the computer thru dash harness and to the pedals. This is one of the frequently confused discussions on the net for mustang wiring harnesses and conversions. I explain all 4 different pinouts on one harness. Thanks for looking. GL!
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Thanks a lot! Great info I’ve been searching for. Doing a maf conversion and manual swap at the same time.
I have a 1990 f250 5.8 speedD I want to do an engine swap to a 96 5.8 MassA and I don't have the computer or wiring harness from the 96.. can I use what is existing in the 1990 manual transmission or will I have to swap the whole wiring harness out.. ???🤷🤦
Thank you..
My 87 is wo/ cruise control, so no VSS, did a mass air swap, using a 92 A9L. So I should add the jumper from 1-6? You did say the later years had two harnesses , that’s why I ask. Also would you recommend adding the VSS & matching speedometer cable? Thank you very much for the information and helpful videos!
I have a 1987 fox that the previous owner put a carb on it. Has no computer. But i plan on using the megasquirt computer. Can i just use the 87 o2 harness
I have a 1990 grand marquis I trying to switch over to mass air what year harness and computer do I need
I converted my '87 from AOD to T5. I am in the process of doing my MAF conversion. Do I need to worry about swapping the harness?
I've been going through hell with my fox body and I'm going to be checking my 02 Harness soon because my car I think was swapped from AOD to T5 and I'm not sure whats going on with the neutral safety switch or circuit. Thanks so much for this video
Yw !
@@Neomustangs Hey Neo, so I finally got around to checking my 02 harness today and I simply don't see any jumper or even a place for the jumpers. Would this mean my car has an early speed density 02 harness on it even though my car is an 89?
Yes.
Neomustangs Okay thanks for the reply. I’ve done some more research and I’ve read that this can cause some issues. So I’ll probably buy a new 02 harness and thanks to this video I will be able to pin it out correctly and get this car running right again. Thanks!
For sure!
Not really sure about grand marquis. I only stick with mustangs its what im good at.
I have an 88 speed density AOD changed to a A9p with the maf wire kit from LMR is my harness good to go or do I have to have the jumper wire in 5&6?
I'm converting my 89 4 cylinder to a v8. I have an 89 engine harness and a 93 a9l. Would I repin to match the harness or a9l year?
Thank you for your input. I purchased a engine harness put of a 1989 gt. how difficult is it to seap harnesses? Is that something i can do? Or would i have to take it in somewhere
Vicious Mustang If you don't know what your doing I wouldn't touch it.
Hello neomustangs, can you help me? I have my foxbody 88 speed dynast manual with t5.. I got an ecu 89 mass air harness I want to install it with my original 88 o2 harness but it only has 5 pins will it work with just making the bridge?
What's the low oil sensor wire on this harness?? I got an 86 that doesn't have the loop. I did the mass air swap. But now that I'm rewiring the o2 harness I don't know which ones to low oil wire?
You mentioned changing the dash harness. How so?
Dont need to change dash harnesses you have to match it.
what's the purpose of the loop wire??
Do you have to add the jumper for 86 speed density 02 harness when doing a MAF conversion with a a9l with a t5?
No
@@Neomustangs thanks for the info. I thought that was correct. But there is allot of info going in 90 different directions and not much for an 86 it seems.
Neo ... can you help me out ... i changed my 2004 3.8 mustang over to a 5 speed the parts car is a 2000 3.8 .. what i have in the car now is the wire in from the 02 for training ..04 wire on the engine 04 computer the car runs but i have codes coming up /// O/D and ENGINE runs ruff when idle ..... can you tell me all the parts i need to take off to 02 to get this running right thanks
Mine car is a 91 started as a 4 banger auto I'm running a a9l i know i have to repin the o2 harness do i need to change anything on the dash harness
Nope dash harness is pinned for both.
I have a 88 Auto
Soon be swap to t5 and I really want to convert to mass air afterworlds ,I found this on eBay 1987 1988 FORD MUSTANG MASS AIR CONVERSION KIT METER ECU 5.0 A9L JUMPER HARNESS
THIS KIT IS FOR 5 SPEED MANUAL TRANSMISSION MUSTANGS . Is this what I’m going to need ?thanks
You could do it Without a kit but ya. Looks ok. Gotta be handy with repinning. Don’t use Skotcj locks
what does that Loop do? because I just cut mine off so i wont butn pin 46 on ecu.have a 58 f100
William Lopez I have been working on figuring that out. gave up on google and traced back the wires on my 91 harness and from the looks of it all it does is tell the computer the car is in the start or neutral position. my car was never fuel injected and the harness is basically just hotwired with toggle switches so I'm going to run without the loop just to be safe because it starts and runs fine without it already.
I have an 87 5speed converted to MAF using a A9P. I still have the stock 02 harness. Can i just add a jumper to pin 4-5 in the 02 harness like a factory 5speed MAF car even though I am using the A9P without frying it?
Yes
Here’s the thing. There’s no plumbing for that to work anyways. So it won’t matter regardless unless you have 8 wires on the male plug on the converted harness
@@Neomustangs Thank you for the information
I am currently swapping my 1988 speed density foxbody to t5 and maf .. Can I use the 91-93 manual transmission o2 sensor harness that LMR sells as long as I put an A9L in?
No. 91-93 is pinned different
@@Neomustangs Great thanks for info👍🏻
Hey bud question. I have a 93
V8 auto harness hooked up to a A9L in my 4 cylinder auto coupe that I'm converting to 5.0 question is how should I pin my o2 harness 5 to 6 is what it originally. and I pinned it 1 to 5. Not sure what year the o2 harness? The harness and o2 sensors off different cars
91-93 was 1 to 6. IT was a blue wire.
That's what I ment 1 to 6 is what I pinned too. I wasn't sure tho because how my main engine harness was form a 93 AOD 5.0 didnt kno if the automatic pin sequence was diff.. but thanks again bud👌👌
Yes AOD is Pinned from 5 to 6. Five speed is Pinned from 1 to 6. 91-93.
Is there a way to find out what year is a wiring harness and a computer ?
label or a number thanks
Robert Sanchez The computer usually has a nomenclature sticker where it plugs into the harness. There should be 3 letter/number combo in big bold dark text in the corner of the sticker. A9L is usually 5 speed. A9P is usually automatic. Its easily spoted just looking at the sticker on the front of the computer. As for the harness theres quite a bit of differences so its easily identifiable if you know what your looking at.
Hello I have a question I have a 94 Mustang with ported GT 40p heads intake e303 cam and bolt ons went to the dyno and hit 290 rwhp and 321 torque(stock maf and injectors) I have a master power T70 and planning on getting the on3 set up.Would I have to upgrade The stock trnasmission and if so which do you recommend ?
You could run the stock transmission on light boost and probably be fine for awhile. No slick drag racing as that's what breaks them. I have friends still using stock T5's they freshened up rebuild wise that make over 400 to wheels still driving on their turbos no problems 2 years later. Of course they don't drag slick race it very often at all.
All right I'll guess I will give it a try probably will run it at 8lbs.The stock computer will need to go out by then Thanks for your input
Stock computer wont go out. I push mine well over 500 Hp
Mine is not the A9l as yours 94-95 computers are notorious bad when putting upgrades as turbos
neo, i am running a 88 gt previously a SD, AOD, it was converted to a mass air and a t5 transmission with an A9P but no 02 harness was changed. which harness should i use? i have burned 2 computers, and the car wont start, could the 02 harness be the cause of it?
Vicious Mustang If you have burned up two computers I would suspect someone maybe didn't convert the harness correctly? The A9P is sorta universal computer meaning it'll work with both NSS (neutral sensing circuit which runs thru the 02 harness plug) for both AOD and T5. If it were an A9L I would say its a good possibility your burning the traces on the NSS circuit but being its and A9P id have to suspect something else.
What if I have an 89 with a 91 o2 harness that's looped 1 to 6? That's how my car is currently set up but it's speed density (was 4cyl converted to v8)
When I go to mass air should I change it 1 to 5 or leave it 1 to 6????
Appreciate the help.
Yes
@@Neomustangs Yes, change it to 1 to 5 or can I leave it 1 to 6?
@@Gear1993Head follow The engine harness so 1-5
@@Neomustangs thanks man. Whoever swapped the car did a halfass job and im trying to "un-puzzle" it. Currently it's an 89 with a 93 drivetrain but they used an 87 DA1 computer and engine harness. Didn't even bother changing they headlight harness, just stretched the alternator wiring across. But for some reason they used the 93 o2 harness.
I have a A9p mass air. I want to use that computer with a t5 is that possible
Yes
Does the computer need to be flashed or something like that will start with any ignition switch?
Will a A9P computer work on a 5 speed car? I am doing a mass air conversion on an 88 gt with an 89 harness? If it will work should I leave the the jumper wire alone in the o2 harness?
Mike Moreau Yes. The A9P will work just fine in the T5 car. As well as the matching 02 harness. Keep in mind tho that A9P lacks the same idle logic that the A9L (5 speed original) computer does. So you will have times that the car may hunt for idle specially after driving and coming to a stop sign. Its not uncommon.
Neomustangs Great! I will see how it does and probably end up getting a A9L pcm if it is a problem. Do I leave the factory 88 o2 harness alone with the A9P pcm in a five speed car or do I swap those 2 pins? Sorry for the confusion..
If the 02 harness is pinned for A9P leave it alone.
Question... 93LX 4cyl auto swapped to 5.0 and 5 bolt, T5 by someone else. I am trying to finish the job because I bought the car. The engine harness is a 91 (watched your video) but the O2 harness is older (no loop no holes in rubber) ... will this cause O2 or running issues? Hesitates.....
Add your own loop. Its just a signal return wire.
@@Neomustangs If this is not present will it cause the computer not read o2 sensor's?
@@75yeayea It will do things like that yes.
@@Neomustangs Thank you! Appreciate the videos and info.
Yw
If I have 87 car it's a 4cyl it's a aod car doing a V8 swap have a 89 Maf harness ok my donor car is a 92 gt I want to put the t-5 in the 87 with 89 engine harness can I use the 92 o2 sensor harness on with the 89 harness I have a9l computer?
James Voss no. If your using an 89 mass engine harness pin the O2 harness to match the 87-90 style pinout for signal return.
So use 89 o2 harness manual transmission?
Neomustangs can you recommend a place I can get a place I can get a o2 harness from that's all ready pinned out for what I need!
Hey I got a little confused I went with Tim at PonyPerformance.com great guy in I would recommend him 2 anyone my question since my computer is coming from a 92 car it's a A9l computer I shouldn't have to repin any wires or just pick a computer up for a 89 ! Thanks for any feedback u seem to have a lot of knowledge about Mustangs! Yeah I got the 89 o2 harness with the trans harness from Tim after a guy ripped me off sold me a speed density hardness o2 harness I did get my money back but will not deal with anyone else but Tim I am sorry taking up all your time love you Videos!
I got an 86 vert swapped to mass air and have to ecms A9L.. How should I pin it
Can I still use a speed density o2 harness if I add the jumper wire?
Have an 87 harness with no jumper but I'm sure I can find a jumper wire for it.
Yes
@@Neomustangs Thank you, I actually went and looked at harness and it doesnt even have the 8 pin on the connector from the ecu harness because I'm using an 87 ecu harness and converting it with the LMR kit so looks like I wont have to add a jumper at all correct?
@@Gear1993Head don’t need to Add. But pay attention to signal wire to VSS and fuel pump
@@Neomustangs What should I look for with those? Havent heard of that one before