It is currently Mon Dec 22, 2014 2:59 am





Post new topic Reply to topic  [ 9 posts ] 
1984 f150 4x4 300 6 wanting to remove yfa and all smog stuff 
Author Message
New Member

Joined: Thu Mar 05, 2009 9:32 am
Posts: 1
Post 1984 f150 4x4 300 6 wanting to remove yfa and all smog stuff
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.


Thu Mar 05, 2009 1:45 pm
Profile
Registered User

Joined: Tue Feb 17, 2009 1:56 pm
Posts: 4
Post 
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.


Thu Mar 05, 2009 1:58 pm
Profile
VIP Member

Joined: Mon Jun 14, 2004 3:42 pm
Posts: 876
Location: Helena, MT. pop. enough
Post 
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.


Thu Mar 05, 2009 3:44 pm
Profile
Registered User

Joined: Mon Dec 01, 2008 6:06 pm
Posts: 330
Location: rural NW Arkansas
Post 
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.


Thu Mar 05, 2009 4:00 pm
Profile
VIP Member

Joined: Mon Jun 14, 2004 3:42 pm
Posts: 876
Location: Helena, MT. pop. enough
Post 
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.


Thu Mar 05, 2009 4:21 pm
Profile
Registered User

Joined: Mon Dec 01, 2008 6:06 pm
Posts: 330
Location: rural NW Arkansas
Post 
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.


Thu Mar 05, 2009 5:17 pm
Profile
Registered User
User avatar

Joined: Sat Dec 31, 2005 12:45 am
Posts: 2491
Location: about an hour from Seattle.
Post 
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
87 E-350 6.9 diesel, c6, 3.55s, powertrax no-slip locker, onboard 120v power and compressed air, built out with toolboxes and toys


Fri Mar 06, 2009 12:17 am
Profile
Registered User

Joined: Tue Feb 03, 2009 1:49 pm
Posts: 41
Post 
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........


Fri Mar 06, 2009 5:38 am
Profile
Registered User

Joined: Tue Feb 17, 2009 1:56 pm
Posts: 4
Post 
Sorry guys, I forgot to mention that I did in fact replace the distributor. I went back with a duraspark 2


Fri Mar 06, 2009 9:37 am
Profile
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 9 posts ] 


Who is online

Users browsing this forum: Google [Bot] and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © phpBB Group.
Designed by Vjacheslav Trushkin for Free Forum/DivisionCore.