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I'm wondering if there are books/articles or perhaps an open source project on the theory and design of engine controllers (ECUs)? It seems like designing an ECU could be a fun project and I'm also curious to know how they work and I think it would be helpful to be able to think about how ECUs typically work when troubleshooting.

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    interesting read on the 80's dodge ECUs - thedodgegarage.com/turbo_pfi.html
    – rpmerf
    Jul 22, 2016 at 20:07
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    I've actually considered how hard this would be. I've done some work with the arduino and I am a software developer. I was considering buying an arduino and having it read a few engine sensors, and output data to the screen or log to a file. I was planning more on using it for datalogging, but once it has the inputs, you can start building outputs. Was wondering if I could use this for a carb to TBI swap.
    – rpmerf
    Jul 22, 2016 at 20:17

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I've been looking into this myself for a project and found an open-source ECU. It's been ported to 39 different vehicles so far, 7 of which are claimed to be daily-drivers.

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