Ok I know theres quite a few people who have done the 5.0 swap in their cars. It seems to be one of the most done swaps short of the T-5 swap. I got a harness from a 90's mustang and from what I can tell theres 2 big round plugs on it that wont plug into anything due to the shape of the plug. On of them is for the O2 sensors the other is for some guages or something according to www.fordfuelinjection.com (http://"http://www.fordfuelinjection.com") . My question is where do these go? I know the one for the O2 sensors its pretty much a given I'm going to either have to mod the new harness or mod the O2 sensor harness on the motor so they connect. What do I do with the other one? I already have temp senders and stuff in the injector harness what do I do with these? Also theres a small round plug in the part of the harness that goes to the coil. it has 2 connectors in it, not the one that connects to the battery cable, the other one, what does it connect to? My other question is what all in the factory V6 harness can I remove I have a few plugs that hooked to the motor off of the body harness like the oil pressure and AC wires do I need any of the wires that originally hooked to the engine or is that what the harness I'm having trouble locating a match for goes to? Oh and an extremely dumb question when they say left O2 sensor is that the driver side?
My opinion is to take the o2 sencor off another mustang and mod it into working for your harnes your gona put in.
the last question is a cinch,,,,, left is driver side.
The normal orientation of left is driver and right being pass side. If you ever forget,, just have a seat behind the wheel,, thats the way all the manuals are written.
the other questions,, they would be much less difficult to reply if you jotted down wire colors and also leave out the connections to which you already know what they go to.
Yes jcassety is right but remeber always have masking tape with wires marked where they go before you cut !!!
Yeah the masking tape idea would have been nice but the harness was bought off ebay so I didn't remove it from a car.
On the driver side being left I thought so but wasn't sure.
As far as which one's I don't know at all. The little round one by the coil. It's located on the driver side down by the battery.
There's a portion of the harness that goes to the coil. the part of the harness also has the ground wire that connects to the negative battery cable.
I'm not sure on the wire colors someone seems to have painted them black at one time. It's a little round plug with 2 connectors in it.
There is also a single wire here as well is it a power wire from the coil or is it a ground?
The other plug is on the passenger side Its one of the great big round plugs with a bunch of wires. According to fordfuelinjection.com ,they should be colored as follows,
w/r OIL PSI GUAGE , r/g PWR TO ECC RELAY/TFI , w/p GND FOR PIN30 AT ONLY , r/lb +12 START FOR TFI , t/y TACHOMETER , r/w ENGINE TEMP GUAGE , g/r SIG-RTN FOR PIN 30 MT ONLY,p/y NDS PIN 30. I'm not sure where this plug goes.
There is also a square green one that from the diagram looks like a fuel pump plug mainly here's the wires for it.w/r Low oil sender I don't have so this one shouldn't be there.
the rest I'm not sure. g/y HEGO PWR, p or r AC ON FROM DASH,dg/y FUEL PUMP PWR/ FUEL PUMP MONITOR PIN 19 ,pk/o VSS-, g/bk VSS + ,pk/g CHECK ENGINE LIGHT.
On the square green one its down in the foot well next to the computer.I'm sure its what runs my fuel pump it also has a HEGO/ OS sensor power wire as well as the check engine and VSS wires I'm not sure where to get these wires from.
The one for the O2 sensors is SUPPOSED to be wire colored as followed LB/Y MANUAL, LB/Y NDS PIN 30, GY/BL L HEGO , W/PK LOW OIL SENDER, LB/YAUTO, BK/W HEGO GROUND,R/BK R HEGO , G/Y HEGO PWR. How's that for telling which wires I need?:D
You know I just noticed I stuck this in the wrong forum
No biggie but how bout editing the post above that has the wiring question... Break it up in seperate sentences, so I my eyes don't go crossed trying to read it... :crazy: :crazy: :crazy:
maybe i got lost to,, was just trying to be as polite as possible but to be honest, ive been gone so long, im not familiar with your specs.
im lost as to what you are doing,, from what engine to what engine ect ect. your sig says a 5.0 is going in place of a 3.8. I was gonna post up some of my evtm stuff for you but im kind mixed up. the wires you say are painted black,,,,???,, peel back the wire grommet and you'll find the colors. I mean,, how in the world are you gonna know unless you get the colors right.
How is your swap going? Just wondering cause you might have better luck using a cougar/tbird v8 harness as opposed to the mustang one.
Ok edited it some more not sure it helps I'm kinda confusing myself with it so I'm sure everyone reading is just about as lost. Its one of those things that are definitely easier to show instead of explain.
On the specs the car had a 3.8 V6 with AOD. We're swapping in a 5.0 and still using the AOD.
The harness is out of a 90's mustang I'm not sure exactly which 90's but I do know its for a 5.0. And on how I'm gonna get it right, hope that by some miracle the plug position is right :D
As far as how the swap is going, I would say pretty good considering. This wiring is being a pain though. As far as using a V8 harness for a T-Bird or cougar my funding hashiznit O on how much I have to spend right now.
An easy question where is the connector closest to the computer that runs the fuel pump?
Is there one or do I need to run a new wire to it?
I think if I can get fuel flowing to the motor I can find out about the rest fairly easy.
No guarantees on that though I'll probably end up back here a couple minutes after I try and fire it up.
this will give you a large step ahead of the game......
this is specific to the 87and down 5.0L but useful wire colors will come in handy.
and the last page
I'm almost as lost as I was when I posted this lol.
I'm guessing the big blue rectangle down the middle is the computer correct?
OK who wants to come wire my car for me?
yeah,, it says so on the diagram
you cant be lost,, print these out and do a stare and compare on your engine harness(s). If your not use to schematics,, its kind intimidating but just understand that this is the start and end point of each wire and is exactly what you need. If your not sure about what all the other little parts are in the car like TPC, ISC, MAP ect ect,, then yeah, i understand why you are lost and you should back up a few hundered steps and become familiar with the components first and identify them in your car.
i have the 3.8L engine eec harness diagram also if that is helpful.
Another thing,, a cold beer might help as well:hick:
yeah I understand how to read schematics, as well as know what the parts are called.
The problem I seem to be running into though is this.
For instance on the O2 sensors correct me if I'm wrong here.
Its showing 3 wires coming out where mine only have 1?
and I think my harness has more wires then that it sure looks like alot more coming out of the computer.
The problem is Ford changed the wiring and connectors almost every year when the FI stuff was fairly new. A air bag harness for a Stang is different than a non baggie type. Good thing is the different circuits use pretty much the same color wiring between the Bird and Stang... Bad news is they occasionally subistuted wire color due to lack of a certain color combo. So the green/tan may have gotten a green/pink wire(example) I found a couple that were different from the wiring diagram in the '87 Bird harness I have in my TC.
AFAIK the fuel pump plug should be on a short lead connected near the computer connector. Wires are, power(2), relay controll and ground. Wire color is confusing as Ford used two different hookups between the std Birds and the TC but wire color was the same. What you should have is:
Yellow... main power to the relay(feeds contacts)
Pink/Black to the fuel pump(from contacts).
Red.... to fuel pump energizing coil(probably connects to pink/black TO and FROM the inertia switch).
Tan/Light-Green... this is the ground for the relay coil to energize it, is fed from pin 22 of the EEC. The EEC only supplies ground for the relay IF it is receiving a iginition pulse. So the fuel pump circuit will NOT function unless the EEC is receiving power(red/green) and pulse back from the TFI...
To avoid the issues you're having, I wired my TC with the '87 Bird harness BEFORE the engine was installed. Also connected all the sensors and scanned the computer to be sure things were correct and it would run. Absoultly amazed my buddy I could scan the EEC with no engine in the car.... Started on first try...
turbocoupe50 is it a big square plug for the fuel pump? square green resembling the mirror plug under the console.
If I remember correctly the bird use a smaller grey plug... Anyway best to check the color of the wires. If nothing else follow (IF you can get to it), the wire from pin 22 of the computer. It has to lead to the plug...
You sure it was a 90's? V8? What year did heated O2 sensors (3-wire) come out?
eBay link to the item? Or was it bought a loooong time ago?
The three wire sensors have been standard on 5.0s since the first SEFI in the '86 models...
The CFI 3.8 used the single wire sensor thru '87
I think I found it its a small Grey plug with 3 wires in it. I ran across one thats square and has 4 wires in it. funny part is when I test it with power and a test light the speakers in the door pop. One of the wires in the plug is the wire color the EVTM pages show. anyways I'm taking that and rewiring my harness. I'm tired of playing guessing games I'll use the harness from the mustang and the harness that was in the car and make one that works and plugs right in. basically its ticked me off. I'll let y'all know how it went tomorrow
I looked at mine('87 5.0 Bird harness)... Round, grey, four pin plug near the EEC... Has red, yellow and tan/green wires(only three)... At the relay in the trunk(near right shock mount), same wires with the addition of pink/black to feed the fuel pump..
I dunno what the plug will look like on the Stang harness...
yep thats it on the stang harness it looks exactly like our mirror switch harness plug under the console thats actually where I got the plug to connect to it I cut it out of my parts car. doesn't matter now though I'm wiring it with the plug for my car, I came to the decision that it would be better to mod the harness and not the car harness in case I ever get parts for the car later on.
I got the harness wired. Using the EVTM I came up with about 4 wires that the car didn't need that were in the stang harness at least it doesn't show a spot for them on the blue stripe down the middle of the pic.
OK update I got the harness sorta made and ended up with a big knot. straightened it out enough to hook everything up to see if its going to work. I have fuel now, yay me. but I lost spark to the distributor now. basically there is no power going to the distributor and the only way I can get everything to power up is to run a hot wire from a hot spot to the connections that need power. If it wasn't for the fact that the computer adjusts voltage and the fuel and the spark and all this stuff Id just run hot wires to all my from the battery and call it good. I'm basically a half step past fed up, 2 steps passed pissed off, and one step away from just blowing it up.Ive been doing this swap for a week straight now and this wiring is taking up most of the time in it its starting to look like anyway. Tomorrow I go out for attempt 3 of getting a wiring harness installed/made to make the car run.
OK I got it something going now. I'm not sure what I did but I took the harness out of my parts car which is a 3.8 I took the wires out of the 5.0 harness that I didn't have and replaced/swapped/moved wires in the harness. unbelievable it started. as soon as I got the timing issue straightened out it purred with a rumble that would make someone cream themselves( the girl helping me almost did). ANYWAY for some reason the yellow wire for my fuel pump relay isn't working I have to use the one that was in the harness for the 3.8 and hot-wire it direct. I have to figure it out and find out what of my sensors aren't working or aren't hooked up kicking the check engine light on. The main thing is it works. It may not be right and it may be frowned upon but it made the thing start and run so it cant be all bad.
So who can tell me where the yellow wire goes in the computer that runs the fuel pump relay and at least one of the sensors on the passenger side of the motor. I can hear something click there when I hook power to the wire just not sure what it is. Could be my IAB not sure if they click though.
"the yellow wire"????????????
is it a solid yellow wire?
I believe so sorry I wasnt more specific on it I typed that early this morning
hooray dont worry about it guys its done it rumbles like a big kitty and no check engine light. its got a cam lope from hell sound though thinking my timing is off a little. I found out I had an egr wire in the wrong spot. and the mysterious yellow wire was the other EGR wire