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Thread: By passing Lean Burn Computer

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    Aspen and Volare Junior Member bbeep79's Avatar
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    By passing Lean Burn Computer

    I have a '79 Road Runner that I bought new, and have always babied it. It has a 318 with a Thermoquad as original equipment. It has a hard starting problem, which I am starting to suspect the Spark Control Computer is the cause. Once the car starts, it runs fine. I've heard and read that the computer can be by passed to improve all around performance.

    I have a non-Lean Burn distributor, but am unsure about the whole by pass operation. Is there a wiring harness available that plugs into the harness for the computer, and into the replacement distributor? if so, where do I obtain one? Was there something issued by Chrysler, and if so, what part number would I be searching for?

    As I said, I've had this car since July of '79, with no modifications, I don't want to cut any wiring. Anywhere I can buy a replacement computer, or have this one checked out?
    and yes, I did replace the air cleaner with this one, though I do have the original.

    Any and all help is appreciated.

    Thanks!!

    Stew Masche
    Lake Mills, WI
    Attached Thumbnails Attached Thumbnails 1979 Road Runner 5-7-2015.JPG   1979 Road Runner 5-7-2015 6.JPG  
    Always one bad decision away from a good time.

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    Aspen and Volare Senior Member DCAspen's Avatar
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    Nice ride,Looks good with the back window louvers.

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    Aspen and Volare Super Member 77rr2x4s's Avatar
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    Is there a part number on the computer? I see them on ebay all the time.

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    Aspen and Volare Senior Member 7T8 Custom's Avatar
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    Marty has a couple in stock.

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    Aspen and Volare Super Member 77rr2x4s's Avatar
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    Here is a 79 computer on ebay but it is for C body. https://www.ebay.com/itm/1979-FURY-M...Zaen2u&vxp=mtr

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    Aspen and Volare Super Moderator aspen79's Avatar
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    If you decide to go that route, NAPA has remanufactured ones available.

    https://www.napaonline.com/en/search...entForm-newveh

    To convert from ESC to regular electronic ignition, the ECM and wiring can stay where it's at to keep the original look. You'll need to change the distributor, go from single to dual ballast resistor and of course, install an ignition ECU. Also, you'll need the obvious wiring and connectors to hook it all up. It's been so long since I did a conversion on my '78 Cordoba over 30 years ago, I can't remember the specifics except that it requires very little cutting and/or splicing and it took all of about 1/2 hour to do. The easiest way to get all the parts you'll need is to get an electronic ignition conversion kit. When I did the Cordoba, there were hundreds of donors in the scrap yards to get all the parts from, not so much now. Instructions for the conversion are most likely somewhere on the inter-web. As I said, it's been so long I just can't remember the specifics.
    https://www.summitracing.com/parts/s...a/instructions

    The Summit kit is very similar to the old Direct Connection/Mopar Performance conversion kits from years ago.
    Last edited by aspen79; 02-22-2018 at 01:54 PM.
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    Aspen and Volare Junior Member bbeep79's Avatar
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    Thank you, everyone for your responses and comments. I'll have to check the part number and go from there.

    Stew
    Always one bad decision away from a good time.

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    Aspen and Volare Super Member 77rr2x4s's Avatar
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    good luck

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    Aspen and Volare Junior Member
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    I found this instruction sheets, hope it helps
    Attached Files Attached Files

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    Aspen and Volare Administrator White Aspen R/T's Avatar
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    You could also bypass it with a MSD ready to run distributor. I did it on my Gran Fury
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