sefus":1zsd0vbt said:
Wow that feedback YF is funky. So if a guy had them both, which would you concentrate on for a rebuild then install on a 200i6 with a DSII system and just wanting to jump in a drive the car, not pretending its a race car or something its not? I guess can the YF be modified to work without the ecu metering stuff easily enough or is it a big pain?
Not just funky, but it was cutting edge in mixture control......when it worked.
They are still around today, but many have been by passed by doo gooders who are forced to rebell to look after an otherwise good truck or specialty coupe, and find the draconian rule of EECIV all too complicated.
If you want to, you buy a 65$ ArduinoBoardUno, add narrow band O2 sensor, and run the Pulse Width Modulation open source code to open loop the air fuel mixture.
Actually, it was
64 200 ranchero who first had the idea. You can control safe systems with a servo these days. Not accelerator, but choke puilloff, fuel control are aho so easy to manage.
viewtopic.php?f=1&t=67077&p=523238#p523238
64 200 ranchero":1zsd0vbt said:
i bought this type of servo setup, i think i can adapt it somehow
http://www.youtube.com/watch?v=KSmRWhTQ ... re=related
EECIV is not a system I'd recommend unless you convert to a TFi ignition.
These things run best at leaner than the 14.7 :1 indicated or 15.1 actual on todays fuel blends. 15.5 or 16.1 is possible.
I am serious about the Carter YFA carb being an option. Technology is so cheap now, and the parts supply for this carb has improved considerably.
The YFA Feedback Two Step metering rod info exists now, too. The Feedback YFA has two kinds of generic calibration, that is changed with just the metering rod and Mixture Control Slenoid.
For Use with two kinds of Mixture Control Solenoid 2.3 Ranger/Mustang/Capri E4PZ-9S565-C or MX 33 or MCS-8
or the much richer Big Six 4.9 MX 32 or MCS-9 and its two step rod.
In my humble opinion, the only mistake was for Ford to add to these systems to a somewhat complicated 35 year old veteran carb with check valve and variation prone issues already AND THEN add a very sophisticated EECIV control module. That was, um, optimistic....
As a utility maintenance worker, I did work on Liquid Propane conversions, and the Ak Miller writen 1984 TSB manual said this trouble some piece could be jumpered by an Impco Fuel Control Valve, which then allowed the EECIV computer and MCS to behave normally, but it would be remote controlled by another system, Impcos Command Module.
These days, a little
MCS-8 Ford 1 Barrel YFA Pulse Solenoid 1983-86 Ford & Mercury 4 cyl., 1983-84 Ford Truck 4 cyl.
The Holley 1-bbl 6145, 6149, 6153, look the same as the YFA Feed Back Carb, but are not the same, and don't have the Mixture Control Solenoid.
Ford's generic 4 cyl 2.3 OHC replacement part is
E4PZ-9S565-C
Walker 318-2006 still supply it
Its Standard Motor Part MX-33
"http://www.ebay.ca/itm/
Standard-MX33-NEW-Mixture-Control-Solenoid-FORD-MERCURY-1983-1986-/282029461641"
MCS-9 Ford 1 Barrel YFA Pulse Solenoid 1983-86 Ford Truck 6 cyl.
No longer serviced, they say.
But its around! Standard Motor Part MX -32
"http://www.ebay.com/itm/
Mixture-Control-Solenoid-Standard-MX32-fits-1983-Ford-F-150-4-9L-L6-/162474041769?hash=item25d43521a9:g:0hIAAOSwjDZYmbf0&vxp=mtr"
See
https://fordsix.com/viewtopic.php?t=49168
Its basically fine untill the Pulse Width Modulated Mixture Control Solenoid goes on holiday. Then it pootentially reads the knock sensor, and can then potentially retard the igntion to a set amount, and the EECIV goes into a Skylab orbit, and crashes because the TFi, O2 sensor, knock sensor and MCS cant work within normal limits. The idle surges, and the miles per gallon goes up to 460 Big block level....
The other issue is the nitrophyl coating...it can come off the MCS, get caught in the carb, and you'll never be able to adjust it unless you strip and rebuild the carb and check the float bowl for detritus.
If you know about it, its simple and fool proof. If you don't, and no-one did in the 1981 to 1989 era, then its a pest.
I knew a little about it in 1984, from the Impco Propane Tech Support Bulettins, because my Work Shop Manger was a Ford trained Service techncian who did Propane Conversions, and they pumped heaps of that good old EECIV Blue Injection stuff into his viens before he became my boss.