I am putting an 89 grand marquee efi motor into a 64 pu. What are the wires coming from the front of the C6 on the drivers side. It is a round plug with I think 4 wires. There is a two wire rectanlegular plug behind this round plug. The rectanglular one may be the nuetral safety switch. If I cut this round plug off will it effect my brain box? This motor is attaching onto an 84 Bronco C6.

 

The C6 is not computer controlled.

 

Any idea what those wires are for? I noticed that they go back into the firewall on the passenger side.

 

I would think the car had an AOD, although the possiblity exists that it may have had an E4od. Here's a schematic of the computer wiring. As you can see there is lots of wires going to the tranny. http://www.autozone.com/images/cds/g...3d80173dac.gif

These wires can be as simple as a PRNDL position indicator and the lockup convertor solenoid for the computer, to the complex control system for an E4od tranny.

The best senario for you when you get this all hooked up is you get some nuisance tranny error codes on your scanner when you get the engine going. The worst case senario is the computer sees and important signal missing from these wires, and goes into open loop or some sort of limp home mode. If it goes into open loop, you will not get all the benefits of the fuel injection system, and it will not look at the oxygen sensor for air to fuel ratio info. But some people run the system this way, and the engine will run.

Another sensor that you will definitely need for closed loop operation is the speed sensor. This is usually in the tailshaft of the tranny. On some trucks it was in the rearend.

Try doing some research on the internet. I did some on GM fuel injection systems on a project I was contemplating, and found out lots of info from people who had already been there and done that.

I do not know if they have any Ford stuff, but I remember Painless wiring had lots of good info on their website about what was needed for a fuel injection swap. They had the harnesses and the sensors you needed for a GM setup, but I don't know if they had any Ford stuff. The harnesses are kind of expensive, but you can gain info and possibly modify yours.

You may need to ditch the auto tranny computer and get one for a manual tranny. But then you need to modify the wiring to suit the different setup.

 

That is a lot of wires. the tranny does have od so it is either the aod or the e4od. I bought a chilton for that car today and so far it does not show me anything. I wanted to get a Haynes but Orielly did not have them. I am not to impressed with the chilton electrical schmatics. thanks for the info.

 

Can you clear up some things.
What is the size of the motor you are taking out of the 89 grand marquee?
Are you asking about wires from the 1984 Bronco C6?
What size is the motor the 1984 Bronco had?
Are you asking about wires from the 89 grand marquee transmission to the EEC?

The C6 and the AOD are not computer controlled.

 

I made some assumptions;

The Bronco has the c6

The car was a 5.0 fuel injected engine with an AOD or E4od(still can't figure which one it has).

That he put the fuel injected engine and computer in the bronco, and bolted it to the c6, and now he has all these wires left over that are supposed to go to the tranny.

I am thinking even if the car had an AOD, it would still have wires for a speed sensor, and possibly a position switch. I think the computer has some different idle strategies depending on if you are in drive or park/neutral. I thought it may have a lock-up clutch solenoid, but I did a quick look in the book, and I do not think they had this. I get it confused with GM overdrives which did.

 

My assumptions are;
I have him taking a 5.0, wiring and EEC out of the 1989 grand marquee.
Taking a C6 out of a 1984 Bronco.
And putting in all in a 1964 PU Truck.

 

I forgot about the 64 pickup.

 

SubFord you do have it correct. Upon futher investigation tonight I have determined that it is an AOD. The wires on the rectangular plug attach above the speedometer cable so I am assuming that is the speed sensor. The round plug is above the shifter shaft going into the trannie so that is problably something to do with the position of the shifter lever. I hate to go to all of this work just to find out that it will not idle because of these wires. When you say closed loop does that mean if I wire the speed sensor wires together to complete the circuit that will work? There is a salvage yard that may have the manual harness you I need but boy what a pain in the *** to remove it. I am trying to do this fairly cheap. I appreciate both of your thoughts. Like you mentioned I will probably put it in and see what kind of codes I get. I still have a manifold and carburetor I can use.

 

As I recall from an 88 Van AOD this device that plugs into the tail shaft and held in with a bolt is gear driven. The Speed Sensor piggybacks on top of this device and I think this same device will plug also into the tail shaft of the C6. I see no problems here other than the right gear for the speedometer.

I do not think the Neutral Safety Switch or back up switch on the side of transmission goes to the EEC at all. You should be able to splice the wires from the C6 switch to the wires that go to the Starter Solenoid and backup lights on 64 pickup with no problem.

 

Yes, try to hook up the speed sensor, but after that get it started and see what the computer has to say.

What I mean by closed loop is when the computer starts the engine cold, the oxygen sensor is cold, and will not work. So to get the right amount of fuel into the engine when the oxygen sensor is still cold, the computer looks at all the sensors, and has data tables it goes by to run the engine. The data tables are the Ford engineer's "best guess" to what the engine needs to run correctly. This is the open loop mode.

After the engine runs for a few minutes, the oxygen sensor will be warm enough, and the computer will quit looking at the data tables in memory, and start looking at the oxygen sensor for info if it's too rich or too lean. This is called closed loop mode.

 

I found a pretty decent article when I did a search

here it is
https://www.ford-trucks.com/article/...250_Truck.html
Now that you metion it I think there is a plug on my C6. I always thought it was for the transfer case to tell you when it was in gear. I never hooked it up. I will look at it. I did not think that an 84 C6 would have a speed sensor.

I started doing continuity checks on all the plugs and matching them up to the brain box plug ins. I found a couple that were not listed in the book.

Thanks for all of the info.

 

In 84 they did have some vehicles with electronic carburators, so it may be possible.

 

When I said "As I recall from an 88 Van AOD this device that plugs into the tail shaft and held in with a bolt is gear driven." I was not talking about an electrical plug, maybe I should have said socket hole.

I think the C6 has the same socket hole on its tail shaft where the speedometer cable goes in.
Here is an Image of the 88 Van VSS: