1984 f150 4x4 300 6 wanting to remove yfa and all smog stuff

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1984 f150 4x4 300 6 wanting to remove yfa and all smog stuff

Postby little mule » Thu Mar 05, 2009 1:45 pm

I have a 1984 f150 4x4 with 300 six with 87,000 miles. It is equipped with a carter yfa feedback carb and a bunch of emission stuff i would like to remove.I would like to be able to go around the computer all togather. Just wanted some advice on what everyone hear would take off and remove and what they would go back with. I am not looking for a performance mod the stock torque is fine with what i use the truck for. Just want as good of fuel economy as I used to get before this system started giving me problems and would like the easy to work on old school no computer having truck. Any mods for performace without giving up much fuel economy would also be intresting. Thanks and God bless America.
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Postby 1969_fords_forever » Thu Mar 05, 2009 1:58 pm

The same thing happened to my 1985 F250 4X4. When it got 90,000 miles on it the feedback carb turned to junk. I ended up finding a used clifford intake and headers, so I tore all of the emission stuff off of it and replaced it with the clifford parts. On my truck there were about 30 wires that came out of the firewall that ran to the under dash computer. I traced all of these wires back and found out that I didnt need most of them so I cut them off and put set screw connectors on them to cap them off. In the end I put a holley 390 4 barrel on it and got the same mileage with more power.
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Postby Luckyman » Thu Mar 05, 2009 3:44 pm

1969_fords_forever wrote:The same thing happened to my 1985 F250 4X4. When it got 90,000 miles on it the feedback carb turned to junk. I ended up finding a used clifford intake and headers, so I tore all of the emission stuff off of it and replaced it with the clifford parts. On my truck there were about 30 wires that came out of the firewall that ran to the under dash computer. I traced all of these wires back and found out that I didnt need most of them so I cut them off and put set screw connectors on them to cap them off. In the end I put a holley 390 4 barrel on it and got the same mileage with more power.


Did you need to replace the distributor and get the spark control box for the different distributor? Or was the wire sorting enough?
1 "76" F150 RC, LB, 2WD, 300, NP435, 9" open 3.00, special order 2-76/Delivered 4-76. Still "new".

1 "73-79" F150 RC/SS/SB/4WD, "84"-300, T18, NP205, 9" open 3.50, Dana 44 3.50 open, Offy DP, Holley 470, EFI + single 2.5" exhaust. Gathered from 15+ donor/parts trucks. "Fubar". Runs good, safe, still needs details/project continues.
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Postby Ranger_gone_straight » Thu Mar 05, 2009 4:00 pm

You need a distributor with a vacuum advance. Either a points distributor or a duraspark. With duraspark can use either Ford duraspark ignition module or the GM 4-prong module. I personally like the GM module as I can run TFI ignition coil or GM HEI coil (both coils pretty much same thing). I imagine you already have a TFI coil installed! With points or duraspark module you will need an older coil and ballast resistor.
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Postby Luckyman » Thu Mar 05, 2009 4:21 pm

Ranger_gone_straight wrote:You need a distributor with a vacuum advance. Either a points distributor or a duraspark. With duraspark can use either Ford duraspark ignition module or the GM 4-prong module. I personally like the GM module as I can run TFI ignition coil or GM HEI coil (both coils pretty much same thing). I imagine you already have a TFI coil installed! With points or duraspark module you will need an older coil and ballast resistor.


Ranger, thats what I thought I knew. However Mr. 69 Fords did not mention having to change out the distributor. I was asking to find out if he knew something or figured out something that I didnt know about. Just seeking clarification.
1 "76" F150 RC, LB, 2WD, 300, NP435, 9" open 3.00, special order 2-76/Delivered 4-76. Still "new".

1 "73-79" F150 RC/SS/SB/4WD, "84"-300, T18, NP205, 9" open 3.50, Dana 44 3.50 open, Offy DP, Holley 470, EFI + single 2.5" exhaust. Gathered from 15+ donor/parts trucks. "Fubar". Runs good, safe, still needs details/project continues.
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Postby Ranger_gone_straight » Thu Mar 05, 2009 5:17 pm

Sorry misunderstood. Yes you never know what somebody will come up with, on the Jeep boards they came up with a way to "nutter" the feedback carb on the 258 and make it work without computer. More patience than me, I see a feedback carb and it immediately goes in my junk box never to see light of day again unless it can someday donate some linkage or something.
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Postby The Plankster Prankster » Fri Mar 06, 2009 12:17 am

when i converted the 86 over, i ripped out too many wires to fit in a 5-gallon bucket!! took it all the way back to a points system and got 15mpg average.
only thing my feedback carb ever did was go to the parts store to get my core charge back.
the wiring is relatively straightforward for someone comfortable running wires, so not too much to worry about there.
83 F250 flatbed 300-6, NP435, 4X4, 5800lbs empty weight
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Postby 4x4xFORD » Fri Mar 06, 2009 5:38 am

I just did the same thing your wanting to do on my 85. So far I've put a pre-feedback on the existing intake (had to elongate the holes on the mounting flanges), swapped in a Duraspark/GM HEI ignition (very simple), swapped in EFI exhaust manifolds w/ Walker #54166 y-pipe to turbo muffler (not necessary, but decent performance upgrade), and simply disconnected all ECU sensors/ capped any unecessary vacuum lines. Works very well, and is a MILLION times better than the feedback crap! Minus the exhaust the conversion cost about 200-250 bucks, well worth it, IMO........
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Postby 1969_fords_forever » Fri Mar 06, 2009 9:37 am

Sorry guys, I forgot to mention that I did in fact replace the distributor. I went back with a duraspark 2
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