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Boyd Dash
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Post #1 by Boyd Dash » Thu Jul 12, 2018 10:22 am

I want to remove EEC-IV from my 1986 F150 farm truck used less than 5K miles per year.

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Post #2 by Shorty » Thu Jul 12, 2018 6:44 pm

In my 85 it required a non-feedback carb and a dura spark II distributor, ignition control box, and a different coil. The wire harness between the distributor and the ignition control is needed as well.
85 F150 on 78 bronco frame C6 np205 welded dana44 front, trussed posi nine inch rear. EFI exhaust manifolds into one 2 1/2" rolls on 35x12.5x15 Maxxis Trepador.

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Post #3 by SteveP » Thu Jul 12, 2018 11:38 pm

I used a 84 DSII distributor, control module with blue tab, Taylor high energy coil and American Autowire harness. The harness is kinda spendy at $103 but it's dead simple to install and makes the ignition system independent of the rest of the wiring.

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Post #4 by arse_sidewards » Fri Jul 13, 2018 8:14 am

Your '86 doesn't have EEC-IV. It has the EEC-III feedback carb system.
1994 F150 4x4 8ft, engine is basically stock.

66" leafs, extended radius arms, lockers in both ends, nothing special.

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Post #5 by woodbutcher » Fri Jul 13, 2018 10:38 am

:D On my 84 F150, the swap to DS2 was super simple.Plug and play all the way as all the proper wiring hookups were already in the main wiring harness for the truck.My cost for the conversion was 0 $`s as I was given the distributor and ignition box.OOPS,sorry forgot.Had to buy the non feedback carb at Pick N Pull.$20.00.Including time to go to a friends house to use his timing light was appx two hours.
Good luck.Have fun.Be safe.
"People never lie so much as after a hunt,during a war,or before an election".
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Post #6 by BigBlue94 » Sat Jul 14, 2018 1:28 pm

arse_sidewards wrote:Your '86 doesn't have EEC-IV. It has the EEC-III feedback carb system.

Not sure about this. My 85 had EEC IV stamped on the eec and on the catalyst sticker under the hood.

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1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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Post #7 by SteveP » Sat Jul 14, 2018 3:38 pm

My 86 also says EEC IV on the sticker. IIRC 85 and 86 were the only years Ford used EEC IV with the feedback carburetor on the 4.9L engine.
EECIII was 81-83.

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