Hello there ,, Well we finally got the truck home in early Dec. and were cleaning her up when winter came !!
She is a 1984 Ford f 150 pickup , inline 6/300 , 4x4 , standard cab , 8 ft box , all manual , no a/c.. The frame is straight , the body is straight.. She was only registered from 84 to 88 , She does have some dings and dents ( she came from the Browning Montana area where road rash is a badge of courage ) .. There is NO body rot at all Nore is there any bondo at all !!
At the moment she still has the EEC ignition system of sorts.. The carb seems to be a non feedback type
as there are no wires to it . I cannot find a make only "made in USA , and the number 74608 down low on the drivers side.. There is no module of 3 vacuum switches on the left rear of the rocker cover ( egr-tab-tad ) ..
there is no egr ,that has been blocked off.. there is no air pump or catalic converter or oxygen sensor..
There is no fuel bowl vent, canister purge valve.. This is how she was when we drove her home to Milk River, Alberta and also on a short trip to Lethbridge , Taber and home.. She starts and runs good , no problem cruising along at 65 mph or so.. The manifold absolute pressure sensor is still there and the of course the
TFI ignition module on the distributor is there.. There are a lot of wires that are not hooked up to any thing !!
I would like to convert to the Duraspark II system.. In the mean time is there anything wrong with tracing these
wires out and removing them from the processor ?? Franklin 2 sent me a couple of e-mails about this but at
that time the truck was still out in the field at Cut Bank , Mont. With all this stuff gone and a non feedback type
carb. I wonder how the timing advance works.. I won`t be doing some of this right away as it was -27 the other morning and yesterday the wind was in the 60+ mph range.. I took some pictures of the carb. but I don`t know how to post them as yet.. Thank You All in advance for any ideas
Norm

 

First welcome the fun starts now

You cant remove any of the feed back wiring as that feeds the dist. and the spark happen.
The timing is adjusted by the computer mounted inside the truck on the firewall by the throttle pedal. If any of the feed back system is missing (O2 / EGR / sensors / carb) or has failed the timing gets locked.
Leave it running like it is for now while you gather the parts, dist. / harness / IGN box, or get a HEI dist. off the web (ebay) and once you have the needed parts and got them installed and truck running again you can trace out the wires starting at the computer inside working out.

There was a few things you posted that had me
"Manifold absolute pressure sensor" what / where is that as I did not think a carb truck had one?
"no egr ,that has been blocked off.. there is no oxygen sensor." Did they pul the valve, make a plate to block it then bolt the valve back on or did they remove the valve and adapter to the carb is sitting right on the intake manifold?
Also is there a hole / plug where the 02 was at one time?

The last thing pictures we love pictures
To post them depending where they are stored you will need to be on that be it phone or PC / web site.
I have a lot of my pictures on my web site and a few others on my phone. If the pictures I want are on the phone but is hard to type with it I use the PC to type and then come back to "edit" with my phone to post the pictures from it.

In the post you want to post the picture if you look at the top menu window when you post there is a box with a picture in it, next to the smiley face, that is what you use to post pictures.
Click on it and follow the directions on the screen depending where the pictures are stored.
Hope that helps
Dave ----

 

Most everything a fuel injected truck has, this computer controlled carb setup had it also.

Go buy your duraspark II ignition box. Get it new or get it from the junkyard. Just make sure it has blue plastic where the wires come out of the module. Take the module and lay it over on the driver's side inner fender under the hood. In all that mess over there, you should be able to plug the module in. There may be a plug with nothing on it that plugs in one of the plugs, there may be a plug you have to unplug from your old harness to plug it in. But in some form or fashion, you should be able to plug it in place. If you want to do this as a test run you can, and then plug the old plugs back in place so the truck will run.

During your junkyard run for a module, when you find one you need to also get the harness that plugs into the module, and then plugs into the distributor. This is the one painless wiring sells for $90. You can do better than that. When looking for a module and the wire harness, look in different kinds of Ford/Lincoln/Mercury cars and trucks. It does not matter what engine is in it, all the blue modules are the same. The wiring harness from the dist to the module may be a little different length, but it will be the same also.

Go buy yourself a new or rebuilt duraspark II distributor for a 1980 or so 300 six. This does matter, it needs to fit a 300 six in the earlier years. Stay away from 1983 and later or you will end up buying another TFI distributor like you have.

I would get it running with the conversion, and then you can pull the computer and it's wiring out afterward.

 

Hello FuzzFace 2 for the quick reply ,, I just got in from taking a few pictures , that, if I can figure out how to post them it might help you.. I`m not very good with the computer.. To your questions ,, If the pictures do get on .there is one of the " Manifold absolute pressure sensor" this is just to the right of the starter solenoid.. We have the factory manuals and that is what they call it.. it has a black hose that goes to the carb . and a wire that goes up to the carb. but I don`t know if is also hooked up.. The EGR unit is there but is blocked off and the carb. sits on it and the brake booster vacuum comes off of it .. right above that, at the base of the carb. is a smaller vacuum hose from the PCV valve.. another picture shows a cad plated metal canister taped to the 2 vacuum hoses ( one goes to the air cleaner housing ) by the PCV valve with a couple of wires that come out of it.. I have`nt a clue what this is .. another picture shows the 3 connectors ( EGR-TAB -TAD ) that would go into the unit that held them and the 2 vacuum hoses that went to each one.. As I mentioned , the air pump is gone , the exhaust is straight down into an exhaust pipe , muffler , tail pipe . So there is also no oxyger sensor... There is no connection from the fuel vapor canister and the carb. the carf fuel bowl vent is capped off.. The truck runs good and this is how it was when we drove it home and also on a short trip..
The carb. does not seem to be a feedback one as there is nowhere on it to hook up all the stuff,, the wiring plugs are just hanging in loose air so I don`t know how they would even send any kind of a signal .. Now comes the fun part !!! Trying to figure out how to post the pictures !! Maybe a Rum & Coke First !!

Norm

 

Hello Franklin 2,, Thank you Very Much for the reply !! There are a couple of places in Lethbridge that we can check out.. When we were last up there in early Jan. we were in one of the Pick A Part places ,, but between the snow and it was rather bitter out we did not get to look much..

So far I still can`t figure out how to post any pictures .. I don`t seem to see the box FF2 was talking about but will keep trying..

Norm

 

Scroll down this page, you will see the area "quick reply". Below that area you will see two grey boxes in the middle, one will say "post quick reply" and the other will say "go advanced". Click on the go advanced button. This will take you to another place to type your reply. You can type your reply there, and if you look at the bottom you will see "manage attachments". You will also see the file types supported. Make sure your pictures are in a supported file type, something like jpg will be common and work. Click on manage attachments and another window will pop up. If you have your pictures on your computer, click on "browse your computer" and find your pictures and then hit "open" and then go to the upper right and hit "upload" It will insert the photo in your post if it's a certain file type. Other file types it will attach the photo.

Do you have a picture hosting site like flicker or something like that? You can use that also.

 

I think I know of this "MAP" you talk of and think it has or had something to do with high altitude as I remember something like that posted by others, I just did not know that is what Ford called it LOL
As for the pictures keep poking around and between what the "Dave's have posted we are sure you will get it.
Dave ----

 

Here's a couple of photos of the harness you are looking for at the junkyard.
If you can't find a harness you should just get a GM style coil over cap distributor of eBay or Amazon.
Finding a usable harness for a DS2 ignition system is going to be very difficult if not impossible.
Good luck, Jim
.

 

I wonder if he would have more luck being he is north of the border on the harness?
Dave ----

 

The MAP is how the computer knows the load on the engine. It is measuring vacuum. I am not sure how much influence it has though, since the carb still has a power system also. I would assume when the going got tough and you are pulling a hill, the tps voltage would go up, the vacuum signal from the MAP would go down, and the computer would turn the fuel solenoid to full rich, along with the power valve opening.

 

But I dont remember anyone else saying anything about this on any other feed back 4.9 system and why I thought it was for trucks that live high on mountain tops?
Dave ----

 

This is the 300 feedback system(a part of it). It has the MAP sensor top right in the diagram below.

 

Put a standalone distributor in it and you can take all the EEC wiring out. ALL of it.