inline 6 300 . problems

[napoleankjj2006]

i have a 86 f150. u might rember me from the overheating topic. 1. what does the fast idle screw do actualy? 2. i have a single barrel carter carb. and i have a lot of open and broke ends. if you could plz tell me where they goto. i would greatly apprecaite it. i have replaced a lot, motor and tranny mounts, cap, rotor, plugs, fuel filter, thermostat hosuing, thermostat ( not currently installed ) the below are pics of my issues.plz if u could possibly look at them for me. the 3 pic of the carb: http://i638.photobucket.com/albums/u...6/GEDC0044.jpg http://i638.photobucket.com/albums/u...GEDC0045-1.jpg http://i638.photobucket.com/albums/u...GEDC0047-1.jpg other pics: http://i638.photobucket.com/albums/u...6/GEDC0042.jpg http://i638.photobucket.com/albums/u...GEDC0046-1.jpg http://i638.photobucket.com/albums/u...GEDC0048-1.jpg

[ctubutis]

Man, your truck has got issues.... I'll bet the carb is adjusted to compensate for the vacuum
leak (the plugging of which tends to kill the engine according to your experience). The fast
idle screw sets the idle speed while the choke is on. Hopefully, others will chime in. You
might post the colors of the wires you found (the ones that are sparking). Normally, the
ignition module is on the driver's side fender, perhaps somebody installed an aftermarket,
one-wire ignition - take a pic of your distributor. Hopefully, others more knowledgeable on
this thing will chme in....

EDIT: This looks like somebody's hackjob-attempt at removing the smog stuff but they
didn't fully know what they were doing and couldn't get it to run right afterwards (hence the
vacuum leak, it's probably intentional as they found it runs best that way).

You're set up for some frustrating work....

[napoleankjj2006]

the wire that is sparking is the black one. it has a open ended metal piece.

[81-F-150-Explorer]

The First Picture is of the Choke hot air tubes.

The Right one is the fresh air intake that sucks filtered air from the Carb airhorn. There is a tube that should run from there to a port or opening at the bottom of the exaust manifold. The air goes through a chamber in the manifold and on top of the manifold connects with another tube, and that tube connects to the Left one pictured in picture one.

Picture two I cannot help you with without a picture of the Emissions Lable located on the Radiator Core support.

Picture Three: That is the feedback solenoid. Without that connected, or your computer working properly, there is no way for the fuel mixture to be properly adjusted. The Fuel mixture is adjusted 95% by that solenoid on the feedback carb.


Other Pics: Picture One. The computer is under the dash, or under the seat on the 1986. The Ignition Module is either on the distributor, (Original position) or it was moved off the distributor in a recall Ford had for original owners. You Have a EEC-IV, TFI-IV ignition and computer control system.

Picture Two: That is a comon Problem.


Picture Three: Those are most likely the Feedback Solenoid wires from the computer.

They need to be hooked up to the solenoid. IN THE proper order, for the fuel mixture to be adjusted by the computer. The O2 Sensor also has to be in working order for the fuel mixture to be adjusted correctly.

I think you should in your case start from scratch and Replace the Carb, Ignition Module, and distributor with a Non-Feedback Duraspark-II System.

[napoleankjj2006]

where does the wires taped up hook up to? the first pic. i found the end of the tube hanging down by the starter.
i rebuilt the carb. or what kind of carb would u recommend me buying?

would i check the computer or try to hook up the wires first?

when u say distributor, u mean the thing that goes into the oil pump.?

[ctubutis]

Napolean, I think what 81-F-150-Explorer is suggesting is to wholesale replace your carb &
ignition system with the non-computer-controlled variants, and they all need to be replaced
together, at the same time. You have what is Ford's first attempt at computer-controlled
engines (I guess this explains why you don't have an ignition module on your driver's side
fender), this feedback-carb stuff predates EFI by a few years and wasn't around for long. I
have never seen or dealt with such a system myself, only read about 'em here; I'm sure
there's stuff in the archives about what a good carb would be but locating that info (in the
archives) can be extremely frustrating.

You've got one of the best guys out here (81-F-150-Explorer) helping you with this, I
strongly suggest listening to him and following his advice. I suspect he'll return and answer
your other questions....

[81-F-150-Explorer]

Originally Posted by napoleankjj2006

where does the wires taped up hook up to?

Most likely the wires pictured here:

http://i638.photobucket.com/albums/u...GEDC0048-1.jpg

get hooked up to the feedback solenoid pictured here.

http://i638.photobucket.com/albums/u...GEDC0047-1.jpg

I do not know the orientation of the wires, so it's a 50% chance you will hook it up backwards. They are both black coming out of the feedback solenoid, so there is no other way to hook it up rather than get lucky and guess right unfortunately. If it had the original "Idiot Proof" plugs, it wouldn't be guesswork.

the first pic. i found the end of the tube hanging down by the starter.

It should go into a port at the top of the exaust manifold. You should see a small hole in it at the top of the exaust manifold close to the carb and Intake manifold at the rear.

would i check the computer or try to hook up the wires first?

Hook up the wires first. Remember you have a 50% chance of getting it right. Sorry to say.

i rebuilt the carb. or what kind of carb would u recommend me buying?


when u say distributor, u mean the thing that goes into the oil pump.?

I would recommend getting a different non-feedback Carter YF carb, and Duraspark-II distributor, and Ignition module. This would eliminate all the computer controls and solenoids, and the guesswork, including the one on the Feedback carb you have now that you have a 50% chance of hooking up correctly/incorrectly.

The Distributor is the device that distributes spark from the coil to the spark plugs through the spark plug and coil wires.

A Duraspark-II conversion isn't all that hard, but it might be more trouble than a novice can handle.

It requires Replacing the Carb with a Non-Feedback type Carter-YF.
Replacing the Distributor.
Getting a Duraspark-II ignition module, Blue Grommet.
Coil for Duraspark-II system.
And the wiring that goes from the distributor to the coil and ignition module. This last one is the hardest because the wiring is not being reproduced, As far as I know. You have to get it at a wrecking yard.