85 E150 4.9
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New User
Joined: Sep 2004
Posts: 2
Likes: 0
From: central florida
85 E150 4.9
Thanks for letting me join the Forum.
I have a van that I have enjoyed for many years and miles, now it needs some help in the fuel economy department. I came here to learn all I can about the FYA 1-V feedback carburetor, with throttle position sensor and computer. I really don't understand how the tps and computer controls the carburetor. It used to get super mpg, now it is getting worse every day. It starts, runs smoothe and great, but I smell gas when I shut down for about 5 minutes, with no visable leaks. It shows no engine codes on the scanner is why I want to learn about how the feedback carburetor works. It uses one quart of oil per 3k oil change and most of that is leaks.
I went to my local dealer and they told me the van was too old, not suposed to last 300 k and I am on my own, so I came here before I try to install fuel injection. I plan to put at least 200k more on it before I die or can't function any longer, yes I am an old coot. Thanks for any feedback. Bugzy
I have a van that I have enjoyed for many years and miles, now it needs some help in the fuel economy department. I came here to learn all I can about the FYA 1-V feedback carburetor, with throttle position sensor and computer. I really don't understand how the tps and computer controls the carburetor. It used to get super mpg, now it is getting worse every day. It starts, runs smoothe and great, but I smell gas when I shut down for about 5 minutes, with no visable leaks. It shows no engine codes on the scanner is why I want to learn about how the feedback carburetor works. It uses one quart of oil per 3k oil change and most of that is leaks.
I went to my local dealer and they told me the van was too old, not suposed to last 300 k and I am on my own, so I came here before I try to install fuel injection. I plan to put at least 200k more on it before I die or can't function any longer, yes I am an old coot. Thanks for any feedback. Bugzy
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
I had the same vehicle. I converted it to non electronic controls and increased my fuel mileage. I did it because Ford could not make the computer system work. They kept giving me "No Trouble Found" service tickets.
I used:
1977 Duraspark OEM distributor
1977 Coil for external resistor.
71-74 Replacement carb.
Ignition timing set to 10°BTDC
To use the 77 coil the resistor bypass wire must be removed. Or you can use the stock TFI E-coil as is.
The throttle lever must have a mounting fabricated at the proper radius from the shaft for the TV cable mount. The radius for the TV cable must be very precise to make the transmission function properly.
I used:
1977 Duraspark OEM distributor
1977 Coil for external resistor.
71-74 Replacement carb.
Ignition timing set to 10°BTDC
To use the 77 coil the resistor bypass wire must be removed. Or you can use the stock TFI E-coil as is.
The throttle lever must have a mounting fabricated at the proper radius from the shaft for the TV cable mount. The radius for the TV cable must be very precise to make the transmission function properly.
Lead Driver
Joined: Feb 2003
Posts: 8,140
Likes: 4
From: Oak Harbor, OH
I'd just have that carb rebuilt, it sounds like the bowl is dirty causing the float to stick open a little. The computer contols metering rods inside the carb to adjust the mixture, so be carefull if you decide to rebuild it your self....
