FEEDBACK CARB HELP SOS!
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Cargo Master
Joined: Dec 2009
Posts: 3,452
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From: Santa Fe Tx
FEEDBACK CARB HELP SOS!
OK folks, well the engine management harness fried, when I say friend I mean it's totally ****ed!
I have been hunting for a week and a half searching for one, none to be had.
So the reason for my post is I have decided to go with a DuraSpark II ignition system (or maybe points I am not 100% positive yet on my route cause eventually I'll be going MSD 6al and HEI).
So my question, will the FEEDBACK Carb work without the ECM? I can't afford to have my truck down any longer, it's my DD.
I also can't afford another Carb, I can't find a YFA Carter to save my rear!
Oh sorry fellas its a 1984 F150 stripper model, 3 speed on the tree, 300 straight 6.
I have been hunting for a week and a half searching for one, none to be had.
So the reason for my post is I have decided to go with a DuraSpark II ignition system (or maybe points I am not 100% positive yet on my route cause eventually I'll be going MSD 6al and HEI).
So my question, will the FEEDBACK Carb work without the ECM? I can't afford to have my truck down any longer, it's my DD.
I also can't afford another Carb, I can't find a YFA Carter to save my rear!
Oh sorry fellas its a 1984 F150 stripper model, 3 speed on the tree, 300 straight 6.
Senior User
Joined: Feb 2015
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The computer controls the timing, air fuel mixture, choke, etc on the feedback carb. So IF it does run, it surely won't run very good.
Can you make a new harness for it?
If you are switching the distributor out though, you need a non feedback carb. Have you considered using a different carb other than the carter? Something you can find at the yard, throw it on plumb and go. I don't know exactly what's a fairly direct swap so hopefully someone else can chime in on that. I have heard of some 2v autolite carbs that people use, not sure what vehicle they come factory with though.
Can you make a new harness for it?
If you are switching the distributor out though, you need a non feedback carb. Have you considered using a different carb other than the carter? Something you can find at the yard, throw it on plumb and go. I don't know exactly what's a fairly direct swap so hopefully someone else can chime in on that. I have heard of some 2v autolite carbs that people use, not sure what vehicle they come factory with though.
Thread Starter
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Cargo Master
Joined: Dec 2009
Posts: 3,452
Likes: 2
From: Santa Fe Tx
The computer controls the timing, air fuel mixture, choke, etc on the feedback carb. So IF it does run, it surely won't run very good.
Can you make a new harness for it?
If you are switching the distributor out though, you need a non feedback carb. Have you considered using a different carb other than the carter? Something you can find at the yard, throw it on plumb and go. I don't know exactly what's a fairly direct swap so hopefully someone else can chime in on that. I have heard of some 2v autolite carbs that people use, not sure what vehicle they come factory with though.
Can you make a new harness for it?
If you are switching the distributor out though, you need a non feedback carb. Have you considered using a different carb other than the carter? Something you can find at the yard, throw it on plumb and go. I don't know exactly what's a fairly direct swap so hopefully someone else can chime in on that. I have heard of some 2v autolite carbs that people use, not sure what vehicle they come factory with though.
Thank you for the reply!
I cannot find a used Carter YFA 1 barrel (OEM direct swap) Carb anywhere, even a rebuild able core is proving near impossible to find, and with being laid off I don't have the extra cash to afford a remanufactured one at this time.
Another route would be a Holley 2 barrel to 1 barrel adapter and stick a 2 barrel Holley on it but even then it is a little more expensive than a remanufactued Carter YFA, and of course im beat for cash.
The sensors on my FEEDBACK Carb is a TPS (not concerned about that one) my FEEDBACK has an electric choke and what seems to be a ECM controlled high idle solenoid and a third sensor that I'm not sure of that is bolted on next to a vacuum port that the emissions junk is plumbed too. The third sensor is my only worry, I know for a fact the other two sensors will have no affect on the Carb with the ECM deleted.
The "hot" wires to the ECM fried along with the entire ignition side so, repairing is futile in this case or I would. I'll post a few pictures of my FEEDBACK Carb.
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Cargo Master
Joined: Dec 2009
Posts: 3,452
Likes: 2
From: Santa Fe Tx
That's what I was thinking but not 100% sure and honestly wanted others opinions.
i searched and searched for answers but there's very little discussion on this subject expect to take off the FEEDBACK and trash it, well I would if I could.
With the new distributor in I plan on setting the base timing then tuning it with a vacuum Gage so I should beable to eliminate alot of the rich or lean senario I may get.
Thanks alot for the replies bud, I greatly appreciate it!
i searched and searched for answers but there's very little discussion on this subject expect to take off the FEEDBACK and trash it, well I would if I could.
With the new distributor in I plan on setting the base timing then tuning it with a vacuum Gage so I should beable to eliminate alot of the rich or lean senario I may get.
Thanks alot for the replies bud, I greatly appreciate it!
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Senior User
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But it will run, so you've got wheels to get you around. Being without your DD is a huge pita! I hope you are able to figure something out, even if it's temporary.
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Just kind of brainstorming here but I wonder.. if you could give the carb a false signal from a hot wire. To put in a limp home mode so to speak. Get it to run rich (imo better off rich than lean) and then set your timing from there to get it running the best you can.
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Cargo Master
Joined: Dec 2009
Posts: 3,452
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From: Santa Fe Tx
I will try that and see what happens! The only sensor I have to really worry about getting to kind of work is the A/F sensor.
On second thought with no ECM there will be no limp mode. Hmm more thinking I have to do, if I only know what that one sensor is on the front of the Carb it would make life a little easier on figuring out a solution.
I have to get this ol gal back up and going asap.
Thanks for all the help bud! I really appreciate it. Reps have been sent!
Senior User
Joined: Feb 2015
Posts: 209
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THAT SOUNDS LIKE A GOOD PLAN!
I will try that and see what happens! The only sensor I have to really worry about getting to kind of work is the A/F sensor.
On second thought with no ECM there will be no limp mode. Hmm more thinking I have to do, if I only know what that one sensor is on the front of the Carb it would make life a little easier on figuring out a solution.
I have to get this ol gal back up and going asap.
Thanks for all the help bud! I really appreciate it. Reps have been sent!
I will try that and see what happens! The only sensor I have to really worry about getting to kind of work is the A/F sensor.
On second thought with no ECM there will be no limp mode. Hmm more thinking I have to do, if I only know what that one sensor is on the front of the Carb it would make life a little easier on figuring out a solution.
I have to get this ol gal back up and going asap.
Thanks for all the help bud! I really appreciate it. Reps have been sent!
Edit: I guess it would be just figuring out if with or without voltage increases or decreases the a/f mix. It may default to a rich setting without power.
Cargo Master
Joined: Aug 2007
Posts: 2,558
Likes: 69
From: New Zealand
I haven't had experience with Carters, so this applies to Motorcraft carbs.......disconnecting feedback 2150's from the computer doesn't present any significant problem; it won't put the truck into a 'limp-home' mode in the way it would with later EFI trucks.
The tuning that the ECM does via the carb is very slight; the main fuel metering is still done through the conventional main jets. The choke isn't influenced by the computer.
Without the computer, the carb will go to the rich end of it's scale......that isn't excessively rich though.
But you do need to have done the DSII conversion on the ignition system, or you will have significant timing/power problems.
The tuning that the ECM does via the carb is very slight; the main fuel metering is still done through the conventional main jets. The choke isn't influenced by the computer.
Without the computer, the carb will go to the rich end of it's scale......that isn't excessively rich though.
But you do need to have done the DSII conversion on the ignition system, or you will have significant timing/power problems.
Thread Starter
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Cargo Master
Joined: Dec 2009
Posts: 3,452
Likes: 2
From: Santa Fe Tx
I haven't had experience with Carters, so this applies to Motorcraft carbs.......disconnecting feedback 2150's from the computer doesn't present any significant problem; it won't put the truck into a 'limp-home' mode in the way it would with later EFI trucks.
The tuning that the ECM does via the carb is very slight; the main fuel metering is still done through the conventional main jets. The choke isn't influenced by the computer.
Without the computer, the carb will go to the rich end of it's scale......that isn't excessively rich though.
But you do need to have done the DSII conversion on the ignition system, or you will have significant timing/power problems without the ECM.
The tuning that the ECM does via the carb is very slight; the main fuel metering is still done through the conventional main jets. The choke isn't influenced by the computer.
Without the computer, the carb will go to the rich end of it's scale......that isn't excessively rich though.
But you do need to have done the DSII conversion on the ignition system, or you will have significant timing/power problems without the ECM.
THANKS BUD! Just the info I was hoping for! Reps on the way! Greatly appreciate it
Cargo Master
Joined: Mar 2008
Posts: 2,562
Likes: 207
From: Washington
If your feedback carb is in decent shape it will work fine without the computer.
I have been running this way for years.
more info here...
https://www.ford-trucks.com/forums/1...fications.html
https://www.ford-trucks.com/forums/1...ml#post9672141
The GM 4 pin IGN module with a DS2 dist will be the cheapest and fastest way to get back on the road, as you can make your own harness quickly.
Info here...
Dirt cheap Ignition
Jim
I have been running this way for years.
more info here...
https://www.ford-trucks.com/forums/1...fications.html
https://www.ford-trucks.com/forums/1...ml#post9672141
The GM 4 pin IGN module with a DS2 dist will be the cheapest and fastest way to get back on the road, as you can make your own harness quickly.
Info here...
Dirt cheap Ignition
Jim