hello I recently converted to Duraspark ii

truck is 1985 f150 4.9l

was computerized ( feedback carb., and tfi )

runs- but have a few questions

#1- original starter relay had just 3 posts ( Battery, Starter, and Ignition) two relays later ( 1st OEM I broke, 2nd one froze on starter cranking { just before a job.... interview wow })

I now have the 4 post style ( Batt. ,Starter ,Ignition /run ,and Start only

-How do I wire it to 12 volt coil start only ?-

#2 how do I wire it to...

"Duraspark start only retarding system" ( sorry don't know what that is called)?

 

Wire it the same way as the old one. Don't worry about the other "I" terminal.

 

ok just wondering how to do it.


another question is...


The previous owner rewired some things and the electric choke (white/black )
has been spliced into an orange /bluish grey wire at the regulator , there is a wire connected to the alternator (white/black) that is just dangling .
Isn't the choke supposed to be the hooked up to the white /black wire at the alternator?

 

What is a "feedback carb"?
I have converted my 91 F150 EFI 302 to a 82ish 351W, with 4 barrel carb, and I have overcome fuel supply issues, E4OD transmission computer control issues, but am having problems with the Duraspark modules frying after 20 to 30 min of running, I'm sure I need to get the ballast resistor hook up correctly. I can't locate a diagram taht tells me where the ballast resistor is located. I'm thinking if all else fails of going back to a points style distributor, altho I guess maybe it'll eat up the points quickly. Did you over come this problem, maybe these trucks are different? I need this truck to run for only 2 - 3 months till I get the new one.

 

A feedback carburetor is a carb that is operated by a computer on EEC-IV
equipped ford trucks car etc. ( 1983-1986) TFI-IV etc.

 

ok have you located (aka have the Duraspark wiring harness )?
how have (did you convert ) you converted to duraspark? using existing (1991) harness or no?

if you used the trucks(91's) harness it dosnt have the pink(1986-1976) resistor wire

( pink wire drivers side , under hood ,in the wire loom ,.... pre-1986 trucks)

fyi .... tfi ,eec (computer controlled 1987 up trucks don't need this wire)


you may have to get a ballast resistor do you have a * good * duraspark ii wiring diagram?

I have the wiring diagrams if you can not locate one

 

I have a diagram, but it's not a great one, will your system be the same as my 91 302? Did you use the tfi distributor or is that possible with the duraspark module? I have used duraspark module and distributor with tfi coil, but it keeps melting modules after 20-30 min. And the duraspark system has a resistior wire on the positive side. Tfi on the neg side of coil

 

My 86 I-6 with feedback system has the 2+4 connectors on the drivers side fender, some wires from these connectors come/go to a harness near the steering column and the rest come/go to the big harness that connects to the computer behind the radio. Question is, can these connectors be used when converting to the older DSII system? Will the work plug-and-play? And which resistor are you calling the ballast resistor, the 3" long one with green wires in the harness near the coil or the smaller 1" resistor in the harness near the starter solenoid? ~Bill

 

1st of all I didn't use the tfi distributor (use a duraspark ii dizzy) It won't work , you'd be use 2 modules and the tfi distributor only uses eec computer, ONLY no way to advance timing with out it ...

2nd: the tfi (E-core )coil is what frying your modules (too much current)

3rd : I used

duraspark ii distributor

duraspark ii module (blue grommet)

harness from a pre 87 truck (duraspark ii only)


how did you convert it ,coil ,distributor, module/s ect.

 

Yes, those "connectors" is what you are going to use .
You disconnect them from the computer , from them to the firewall at a large grommet by the engine which goes in to the dash and to the computer etc.. .

The shorter connectors that go towards and behind the brake booster go to the key switch , with the pink resistor wire(keep those there, they connect to the new Duraspark ii harness)
The computer wiring also goes towards the battery and ( if you can trace it)over the engine , towards the map sensor on the passenger side wheel well.
don't mess with the the starter relay wires (most of which is starter and truck power wiring ), unless it connects the the computer harness(eec) there should be 1 wire that does.

but yes it is plug and play 1986 and below

by the way ,what engine is yours ect?

 

The truck is an 86 with 300-6 but I have a hunch the engine has been swapped from an earlier year van, as it has a long, over-the-top dipstick tube that begins up near the fan and terminates in a fitting on the side of the oil pan (not what I've seen on any pickup). But whoever swapped it in apparently swapped the original feedback carb and distributor. There is a sensor or two missing from the back of the rocker cover-open electrical connectors and no place for the EGR green/red vacuum hoses to connect to. It runs ok as it is but I prefer my vehicles running top notch and be able to go anywhere/any distance, and after reading through numerous posts it's becoming apparent it will be most cost-effective to turn back the calendar a few years on this truck rather than attempt to ID long-gone emissions parts. Though CT has emissions testing, over 25 years old is considered exempt.

The truck also has two cats-is this standard fare for these? ~Bill

 

It would be easier to convert to Dura spark ii and non-feedback carburetor
(without emissions controls ,old worn out solenoids etc. it won't ever run right, and will dump fuel like crazy)
two cats? I've never heard of that on these year models , does it have two exhaust manifolds , a front and back ? you probably don't need that many or any for that matter .

engine with those controls( feedback carb etc.) were from 1982/3 to 1986 only so who knows what years .

 

My son has a 1984 F150 and I own a 1986 F150, both with 4.9L engines which are close to being stock. Both came from the factory with two catalytic convertors. The O2 sensor is before both convertors. The pre-convertor sits close to the exhaust manifold [single; log] and the 2nd convertor is before the muffler and has air pumped into it.

 

oh ,interesting mine (1985,4.9) came stock with 1 cat. air connected to before it but previous owner removed that ... and straight piped it along with carb. removed and 1980 carter yfa put in it place (ran like crap)

are those trucks( yours and son's) California or Canada models?

if not some came with them(49state) some didn't

complicated years the 1980-1986/7 ford trucks they did all sorts of ways to curb emissions ect.

 

D7AZ-12250-A .. Resistor Wire-Ignition Coil (Motorcraft DY-213) / See 1980/89 truck parts catalog pic below.

49" long / Color coded red with green stripes / 1.30-1.40 ohms resistance / #16 gauge wire.

Applications: 1977/79 some FoMoCo vehicles, and all 1980/89 F100/350/Bronco/Econoline & FoMoCo Passenger Cars.
------------------------------------------------------------------------------------------------------------------------------------
DuraSpark electronic ignition introduced in 1974, but not all vehicles came with it until 1976.

D1AZ-12250-A .. Resistor Wire-Ignition Coil (Motorcraft DY-84-A).

60" long / Color coded red / 1.30-1.40 ohms resistance / #16 gauge wire.

Applications: 1971/79 some FoMoCo vehicles.
---------------------------------------------------
COLF-12250-A .. Resistor Wire-Ignition Coil (Motorcraft DY-37).

61.49" long / Color coded PINK / 1.30-1.40 ohms resistance / #20 gauge wire.

Applications: 1960/71 all FoMoCo vehicles, some 1972/79 vehicles.
----------------------------------------------------------------------------
Ignition modules identified by a colored plastic square above where the wires feed out.

1U2Z-12A199-AA (replaced D6AZ-12A199-A - D8VZ-12A199-A - D9VZ-12A199-A) .. DuraSpark II Ignition Module-blue plastic square (Motorcraft DY-893).

1976/97: Myriad FoMoCo vehicles.