Getting rid of learn burn.

Electrical and Ignition

  1. 68383GTS

    68383GTS Well-Known Member

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    I have a 1984 slant 6 D150. I want to replace the lean burn system. I believe I just need to replace the carb and put a standard electronic distributior on it. The carb is shot anyway. So should I replace the carb from like a 1974 D150. And could anyone recommend a slant 6 electronic ignition kit. I found a kit on EBay but it said you could not use it to replace a lean burn system. Not sure why I couldn't use it if I was replacing the whole electronic ignition.

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    • roccodart440

      roccodart440 Well-Known Member

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    • jaws

      jaws I put the fun in dysfunctional FABO Gold Member

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    • 67Dart273

      67Dart273 FABO Gold Member FABO Gold Member

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      The statement may be a disclaimer for emissions. Believe it or not it still Federal U.S. law that you can not disable or remove emissions systems----clear back to 68 Federally, and in CA, 66

      Does your system have a dual distributor pickup? If so I believe you will have to do a minor amount of re-wiring--I BELIEVE there is a relay in there somewhere to switch the dual pickups back and forth.

      Sorry I have no documentation on these.
       
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      • missing linc

        missing linc Loose nut behind the wheel

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        Been so long since I did a lean burn conversion that I can't remember what it involves beyond the removal of the lean burn computer and installing the standard electronic ignition system. There is a minimum amount of wiring that is necessary to make it work, there has to be a youtube somewhere that can help you. I don't think it takes more than a couple of hours at the most, and I don't recall having to swap out the carbs, but I could be wrong.
         
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        • halfafish

          halfafish Damn those rabbits, and their holes! FABO Gold Member

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          I just did this on my 82 D150 slant. I took out all the lean burn crap and two fistfills of wires. I put in a Super Six distributor with the HEI conversion. It has maybe a dozen wires in the engine bay now. A regular intake, air cleaner, and carb rounds it all out.
           
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          • RustyRatRod

            RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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            All any Chrysler factory type ignition needs is a switched 12V signal. That's it. I would find whatever switched 12V is feeding the Lean Burn system coming from the factory harness before it gets to the lean burn and use it. Wiring diagram and test light are your friends. If it was mine, I would use an early to mid 70s Carter BBS or BBD, the one or two barrel respectively, whichever it has.
             
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            • halifaxhops

              halifaxhops It's going to get stupid around here! FABO Gold Member

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              Carb, dist, wiring and a ecu (or a stand alone dist) you should be good. Watch out for the kits they are made overseas "authorized Mopar"
               
              Last edited: Nov 24, 2021 at 5:26 AM
            • barbee6043

              barbee6043 barbee 6043 FABO Gold Member

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              I have a NORS dist. for these IF anyone needs such. $20 plus ship,Last one I have.
               
            • volaredon

              volaredon Well-Known Member

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              Another one in Illinois.... looks like a twin to mine (except mine's a year newer) same colors and all, yours looks in a lil better shape though.
              I de-lean burned mine, and went a lil farther and did away with the fusible links as well, I added in a small underhood fuse box and wired everything that used to have a fusible link thru that. I have a fresh /6 on the stand going into mine, will hopefully have a little more oomph than the current original engine..... I had my cam reground, head and block shaved, bored, oversize valves put in, ported, going to a Super 6, and a few other goodies.....
               
            • volaredon

              volaredon Well-Known Member

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              as far as the "legal-ness" of deleting lean burn, all the parts catalogs list it as a "with-or without" thing. Meaning that they built these trucks either way in a given year.
              Meaning that if "some" were made that way from brand new then it's OK to switch between ignition systems to eliminate one (or the other)
              I've seen people do the delete and put the new ignition box inside the Lean Burn housing......
               
            • RustyRatRod

              RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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              Those are supposedly good somehow for EFI builds as they don't have a mechanical advance.
               
            • volaredon

              volaredon Well-Known Member

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              He doesn't specify which distributor he has... You're assuming it's a lean burn version. It could be.
               
            • barbee6043

              barbee6043 barbee 6043 FABO Gold Member

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              Yes lean burn no va adv dual pickups, New remaned never used.
               
            • my68barracuda

              my68barracuda Well-Known Member

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              Nice D150!
              Swapping out the Lean Burn will be a plus, better drivability and mileage.
              And you don’t need a bunch of high priced parts like that Davis ignition to do it.
              1) remove the Lean Burn ecu, it’s either mounted to the air filter housing or up in the driver side front fender. Find the wire that sends power to the LB when the ignition is switched to start and run.
              Use that wire to power the coil and trigger a relay that powers a GM 4 pin hei unit
              2) does the existing carb have wires that go to the float bowl? If so you will need a non lean burn carb. If not your existing carb will be fine. Assuming it is is a good functioning carburetor.
              3) the locked lean burn distributor will need to be replaced with a Mopar electronic distributor with a mechanical and vacuum advance. One that is pre lean burn. Some of those are better than others for the existing ignition curve, but any of them can be recurved, not hard to do. The existing locked lean burn distributor is useful to someone running EFI. I use one with my MS3 Pro.
              3) lots of posts on wiring in a hei module here at FABO . Slantsix.org also has posts specific to a slant six conversion. I like to power mine through a relay, easy to do. Go ahead and buy a real Delhi / Delco hei module, some of the knock off ones just don’t last. The hei will need a good ground and a heat sink, all of that is covered in the posts.
              4) upgrade the coil to one that is designed for an HEI.
              Do a little research then
              gather up: electronic Mopar distributor,
              Carb if needed,coil, hel module and heat sink, a relay and the appropriate wires and connectors, then do install.
              You will like it.
               
            • RustyRatRod

              RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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              Since that's what the thread was about, I assumed he wasn't talkin about an Accel dual point. lol
               
            • geminimotors

              geminimotors Well-Known Member

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              Best to swap out the LB before it fails. My 85 D150 smoked the lean burn and stranded me in Redding CA for three days. LB control units arent really available, and no shop could help me because of CA emissions laws.
              In the end, the parts list was for a '74 D150
              Distributor
              Ignition control module
              Ballast resistor
              Carburetor
              Wire harness w plugs for dist & ecm
               
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